Answer:
Glass is an optically denser medium than air and water.
Explanation:
hope it helps have a nice night!
Answer:
The speed of light depends on the optical density of the medium. Therefore, light travels with different speeds in different media having different optical densities. For example, the speed of light in air is 3 × 108 m/s, whereas that in glass is 2 × 108 m/s and in water, it is 2.25 × 108 m/s
Describe two possible sources of error in the students' measurement when measuring the speed of sound.
Two possible source of error in measuring speed is when there is error in measuring time or the distance.
What is speed?The speed of an object is the magnitude of the change of its position over time or the magnitude of the change of its position per unit of time; it is thus a scalar quantity.
To measure speed of the body is we have to measure distance and time so when there is error in measurement of the distance and time.
Two possible source of error in measuring speed is when there is error in measuring time or the distance.
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If a river is flowing north at 2 m/s and you swim straight across east at 1.5 m/s, how far up shore will you be from your starting point once you reach the other side? The river is 9 m wide
The distance is 12m
The direction of movement of the body or object is defined by velocity. Speed is fundamentally a scalar quantity. Velocity is, in essence, a vector quantity. It is the rate at which distance changes. It is the displacement rate of change.
Given a river is flowing north at 2 m/s and you swim straight across east at 1.5 m/s,
We have to determine how far up shore will be from your starting point once you reach the other side when the river is 9 m wide
First, solve for the time it takes you to reach the other side. Let's let north be the y-direction and the direction across the river be the x-direction.
∆X =Vxt
9m = 1.5m/s x t
T = 9/1.5
T= 6sconds
Now use the time you are in the water to find
∆Y= Vyt
∆Y= 2m/s x 6s
= 12m
Therefore the distance is 12m
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Last question please help!!!!!
Answer:
it is true
Explanation:
Answer:
True, changes of heat can be Endothermic or Exothermic only.
Explanation:
Hello, I needed help with the question boxes on what to fill in.
Given:
To find:
Fill in the blanks
Explanation:
1) Energy can undergo conversion, changing from one form to another. For example, a wind turbine converts the mechanical energy of the wind into electric energy in the power grid. This power grid can then be converted into thermal energy by an electric heater.
2) Solar panels generate electrical energy by taking radiant energy from the sun and having it undergo conversion. This process does obey the law of conservation of energy because energy isn't randomly created, but it is simply converted.
two objects of identical mass begin from rest at the same height at the top of two different hills - hill a and hill b. the hills are inclined at two different angles. the objects are released from rest and slide to the bottom; resistance forces can be considered to be negligible. from which hill will the ball have the greatest speed at the bottom of the incline?
When two objects of identical mass begin from rest at the same height at the top of two different hills - hill a and hill b, then both of the balls will have the same speed at the bottom of the incline. It is because, earth provides same amount of gravity to both of the balls. Therefore both will have same speed.
In Physics, the relation between gravity and mass is described as that both mass and gravity are directly proportional to each other.
In other words, if an object has less mass it will experience lesser amount of gravity and vice versa.
In our case, we are provided with two balls having same mass, as both have same mass so both will experience same amount of gravity which means the gravity will have zero effect on the speed with which they move.
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a sample of a gas is compressible; i.e., its volume can be significantly decreased. this is because multiple choice question. there are attractive forces between particles in the gas phase, whereas in the liquid and solid phases there are not. particles in the gas phase are smaller than they are in the liquid and solid phases. particles in the gas phase are separated by relatively large distances.
A sample of a gas is compressible; i.e., its volume can be significantly decreased because the particles in the gas phase are separated by relatively large distances.
A gas is a substance that has no constant size or form. Whilst inside a closed container, gasoline will amplify to fill the field. An instance of gas is the air you breathe. The gas interior of your digestive tract is fabricated from the air and different gases.
Traits of Gases :
* Gases have neither definite shape nor particular volume. They expand to the dimensions of their container.
* Gases are fluid and go with the flow effortlessly.
* Gases have low density, except compressed.
* Gases diffuse (mix and unfold out) and effuse (tour thru small holes).
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Hi can someone help me please ,Let d= 1 for second part
2)
[tex]F=2.3097\cdot10^{48}\text{ Newtons}[/tex]Explanation
the electrostatic force between two forces is given by:
[tex]\begin{gathered} F=k\frac{q_1q_2}{d^2_{}} \\ where\text{ } \\ k\text{ is a constant}(in\text{ this case we n}eed\text{ asume k=1)} \\ q_1\text{ is the charge 1} \\ q_2\text{ is the charge }2 \\ \text{and d is the distance betw}en\text{ them} \end{gathered}[/tex]then, complete the table we need to use this equation
where
[tex]F=k\frac{q_1q_2}{d^2_{}}[/tex]k, q1 and q2 are ginven in the table, so
Step 1
Let
[tex]\begin{gathered} charge_1=\frac{1}{4} \\ charge_2=1 \\ \text{distance}=1 \end{gathered}[/tex]so,replace
[tex]\begin{gathered} F=k\frac{q_1q_2}{d_{}} \\ F=1\frac{\frac{1}{4}\cdot1}{1_{}}=\frac{1}{4} \end{gathered}[/tex]hence, for tha row
[tex]\begin{gathered} \frac{1}{4}F_e \\ \end{gathered}[/tex]Step 2
now, do the same for the next Fe, so
b)Let
[tex]\begin{gathered} charge_1=1 \\ charge_2=\frac{1}{2} \\ \text{distance}=1 \end{gathered}[/tex]so,replace
[tex]\begin{gathered} F=k\frac{q_1q_2}{d_{}} \\ F=1\frac{1\cdot\frac{1}{2}}{1_{}}=\frac{1}{2} \end{gathered}[/tex]hence, for tha row
[tex]\begin{gathered} \frac{1}{2}F_e \\ \end{gathered}[/tex]Step 3
now, do the same for the next Fe, so
c)Let
[tex]\begin{gathered} charge_1=1 \\ charge_2=\frac{1}{4} \\ \text{distance}=1 \end{gathered}[/tex]so,replace
[tex]\begin{gathered} F=k\frac{q_1q_2}{d_{}} \\ F=1\frac{1\cdot\frac{1}{4}}{1_{}}=\frac{1}{4} \end{gathered}[/tex]hence, for that row
[tex]\begin{gathered} \frac{1}{4}F_e \\ \end{gathered}[/tex]Step 4
now, do the same for the next Fe, so
c)Let
[tex]\begin{gathered} charge_1=\frac{1}{2} \\ charge_2=\frac{1}{2} \\ \text{distance}=1 \end{gathered}[/tex]so,replace
[tex]\begin{gathered} F=k\frac{q_1q_2}{d_{}} \\ F=1\frac{\frac{1}{2}\cdot\frac{1}{2}}{1_{}}=\frac{1}{4} \end{gathered}[/tex]hence, for tha row
[tex]\begin{gathered} \frac{1}{4}F_e \\ \end{gathered}[/tex]Step 5
now, do the same for the next Fe, so
c)Let
[tex]\begin{gathered} charge_1=\frac{1}{8} \\ charge_2=\frac{1}{4} \\ \text{distance}=1 \end{gathered}[/tex]so,replace
[tex]\begin{gathered} F=k\frac{q_1q_2}{d_{}} \\ F=1\frac{\frac{1}{8}\cdot\frac{1}{4}}{1_{}} \\ F=1\frac{\frac{1}{32}}{1_{}}=\frac{1}{32} \end{gathered}[/tex]hence, for that row
[tex]\begin{gathered} \frac{1}{32}F_e \\ \end{gathered}[/tex]Step 6
find the electrostastic force betweeen electrons
let
[tex]\begin{gathered} q_1=q_2=-\text{1}.602\cdot10^{19}\text{ C} \\ k=9\cdot10^9\frac{Nm^2}{C^2} \end{gathered}[/tex]as the distance is not give, let's use
distance =1
replace in the formula
[tex]\begin{gathered} F=k\frac{q_1q_2}{d_{}} \\ F=9\cdot10^9\frac{Nm^2}{C^2}\frac{(^2-\text{1}.602\cdot10^{19}C)}{1_{}} \\ F=2.3097\cdot10^{48}\text{ N} \end{gathered}[/tex]therefore, the electrostaic force is
[tex]F=2.3097\cdot10^{48}\text{ Newtons}[/tex]I hope this helps you
what is the horizontal acceleration of an object undergoing projectile motion?
That is acceleration due to the horizontal component of velocity is 0
When the body is on the projectile we tend to take components on the initial velocity for ease of calculation. The velocity is then divided into its components u sinФ and u cosФ where the horizontal component of the velocity of the projectile is shown by u cosФ while the vertical component of the velocity of the projectile is shown by u sinФ
To calculate the acceleration of either component of the velocity is very easy. In this case, we use the third equation of Newton's Equation of motion.
[tex]V^{2}[/tex]-[tex]U^{2}[/tex]=2as
When we calculate the acceleration of the horizontal component of velocity, we find that since the velocity remains the same at both the endpoint and the start no acceleration takes place.
[tex]U^{2}[/tex][tex]Sin^{2}[/tex]Ф-[tex]U^{2}[/tex][tex]Sin^{2}[/tex]Ф=2as
Thus, 2as=0
That is acceleration due to the horizontal component of velocity being 0
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your rl circuit has a characteristic time constant of 20.0 ns, and a resistance of 5.00 . what is the inductance of the circuit
Magnetic fields and electric circuits are connected via inductance. When a sine wave's peak and zero axis crossing occur at the same time, it is said to be in-phase.
How is inductance figured out?For the inductance calculation, use the formula L = V*Ton/Ipk. All of the numbers needed should be right there on the oscilloscope.
What is inductance in magnetic circuit?Inductance is a property of an electric circuit by which a changing magnetic field creates an electromotive force, or voltage, in that circuit or in a nearby circuit.
What is inductance in DC circuit?An Inductor is equivalent to a short circuit to direct current, because once the storage phase has finished.
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The element magnesium has 12 electrons. In how many energy levels are the electrons of magnesium?
Answer: energy level 2
Explanation:
i did this before
Answer: Magnesim’s electrons are in 3 energy levels .
Explanation: since magnesium has 12 electrons and first shell can only accommodate up to 2 electrons , as shown in picture too, magnesium will have 2 electrons in this first shell or energy level.
Now about rest 10 electrons, 8 will be in 2nd energy level and remaining 2 will be valance electrons and will occupy 3rd shell.
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At 2:00 p. M. Two cars start toward each other from towns 240 miles apart. If the rate of one car is 10 mph faster than the other, how fast does each car go if they meet at 5:00 p. M. ? if 3x represents the distance that the slower car traveled, then which expression represents the distance the faster car traveled? 3 x + 10 3 x + 30 3(240).
135 miles represents the distance the faster car traveled.
Just what is distance?Distance is an object's overall movement, regardless of direction. Regardless of an object's starting or ending point, distance can be defined as the amount of ground it has travelled.
If we call the slower vehicle's speed S, the other vehicle's speed is S + 10 mph.
They've been on the road for three hours as of 5:00 p.m. The faster car travels 3(S+10) miles, while the slower one travels 3S miles.
However, the sum of the two distances has to be 240 miles, so 3S+3(S+10)=240,
3S+3S+30=240,
6S=210, and
S=35 mph.
The faster vehicle travels at 45 mph. We can see that 3S is equal to 3x, which means that x=S=35 mph and that the faster vehicle travels 3×45=135 miles.
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How much work is done pushing a block 200 m with a force of 30 newtons?
what is the density (in kg/m3) of a woman who floats in freshwater with 4.35% of her volume above the surface? this could be measured by placing her in a tank with marks on the side to measure how much water she displaces when floating and when held under water (briefly).
The density (in kg/m³) of a woman who floats in freshwater with 4.35% of her volume above the surface is 960 kg / m³
If the density of a woman who floats in freshwater with 4.35% of her volume above the surface, the density of the woman is 4.35 % less than the density of fresh water. Let ρw be the density of the woman and ρf be the density of fresh water.
In equation it can be written as
ρw = ρf - 0.04 ρf
ρf = 1000 kg / m³
ρw = 0.96 ρf
ρw = 0.96 * 1000
ρw = 960 kg / m³
Therefore, the density of the woman is 960 kg / m³
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During an autumn storm, a 0.012-kg hail stone traveling at 20.0 m/s made a0.20-cm-deep dent in the hood of Darnell's new car. What average force didthe car exert to stop the damaging hail stone?
Answer:
1200 N
Explanation:
First, we need to calculate how much time the force was applied. If the stone traveled at 20.0m/s and made a 0.20 cm deep dent, the time is equal to
[tex]\text{ Avg }speed=\frac{distance}{time}\Rightarrow time=\frac{distace}{Avg\text{ }speed}[/tex]Where the distance is 0.20 cm = 0.0020 m and the average speed can be calculated as:
[tex]\text{ avg speed = }\frac{v_i+v_f}{2}=\frac{20\text{ m/s + 0 m/s}}{2}=10\text{ m/s}[/tex]Therefore, the time is equal to
[tex]time=\frac{0.0020\text{ m}}{10\text{ m/s}}=0.0002\text{ s}[/tex]Then, the force can be calculated using the following equation for impulse
[tex]\begin{gathered} Ft=mv \\ F=\frac{mv}{t} \end{gathered}[/tex]Where m is the mass, v is the speed and t is the time, so replacing m = 0.012 kg, v = 20 m/s and t = 0.0001 s, we get
[tex]F=\frac{0.012\text{ kg \lparen20 m/s\rparen}}{0.0002\text{ s}}=1200N[/tex]So, the average force was 1200 N
During autumn, the storm travels at a speed of 20 m/s, then the average force the car has to exert to stop the damaging hail storm is 1200 N.
What is Force?A force in physics is an effect that has the ability to modify an object's motion. A bulk object's velocity can vary, or accelerate, as a result of a force. Intuitively, a push or a pull can be used to describe force. Being a vector quantity, a force also has magnitude and direction. The SI unit of newton is used to measure it (N). The letter F symbolizes for force.
As per Newton's second law's original formulation, an object's net force is equal to the speed at which momentum is changing over time.
According to the given information in the question,
Speed, s= 20 m/s
Average speed, s = Distance/Time
s = [v(i) + v(f)] / 2
s = (20 + 0)/2
s = 10 m/s
Now calculate the time,
Time, t = 0.0020/10
t = 0.0002 seconds.
Use the equation for impulse,
f × t = mv
⇒f = mv/t
f= (0.012 × 20)/0.0002
f = 1200 N
Therefore, the force applied is 1200 N.
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a circular loop of radius rotates with angular frequency in the presence of a unifrom magnetic field of magnitude . what is the maximum induced emf? express in terms of the variables (omega), , (pi), , as needed.
The maximum induced emf on the circular loop is = Bπr²ω.
What is electromotive force?When no current is flowing, electromotive force (EMF) equals the terminal potential difference.
Despite the fact that both EMF and terminal potential difference (V) are expressed in volts, they are not the same thing. EMF is the quantity of energy (E) that the battery supplies to each coulomb of charge (Q) that passes through.
Let, the radius of the circular loop is = r.
Angular frequency of rotation is = ω.
And, magnitude of uniform magnetic field = B.
Then, magnetic flux; Φ = B·A = Bπr² cosωt
So, induced emf : ε = dΦ/dt = Bπr²ω sinωt
Hence, the maximum induced emf is = Bπr²ω.
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a loop of wire is enclosing area 0.04m^2 has a magnetic field passing through its plane at an angle to the plane. the component of the field perpendicular to the plane is 0.12t, and the component parallel to the plane is 0.05t. what is the magnetic flux through this coil?
The magnetic flux through the coil if the component of the field perpendicular to the plane is 0.12t, and the component parallel to the plane is 0.05t is 0.0048 Wb
Φ = B A cos θ
Φ = Magnetic flux
B = Magnetic field
θ = Angle between magnetic field and normal of the surface
A = 0.04 m²
For the component of the field perpendicular to the plane,
B = 0.12 T
θ = 0
Φ = 0.12 * 0.04 * cos 0
Φ = 0.0048 Wb
For the component parallel to the plane,
B = 0.05 T
θ = 90°
Φ = 0.05 * 0.04 * cos 90
Φ = 0
So, to calculate magnetic flux through this coil, the component of the field perpendicular to the plane needs to be used.
Therefore, the magnetic flux through this coil is 0.0048 Wb
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Consider the diagram below, showing the locations of 6 people in front of a mirror.
Draw ray lines to show:
a. Whose image is person A able to see?
b. Whose image can’t person B see?
Answer: b and c
Explanation: most scientific naswer
what is the apparent weight of a 95 KG astronaut on this rocket
Given:
• Acceleration of rocket = 28.0 m/s²
,• Mass of astronaut = 95 kg
Let's find the apparent weight of the astranaut.
In a direct rocket motion, as we are coming towards the Earth the weight reduces while as the rocket is going up, you feel more weighted.
Now, to find the apparent weight of the astranaut, apply the formula:
[tex]A_w=m(g+a)[/tex]Where:
Aw is the apparent weight
m is the mass = 95 kg
g is acceleration due to gravity = 9.8 m/s²
a is the acceleration of the rocket = 28.0 m/s²
Thus, we have:
[tex]\begin{gathered} A_w=95(9.8+28) \\ \\ A_w=95(37.8) \\ \\ A_w=3591\text{ N }\approx3.591\text{ kN} \end{gathered}[/tex]Therefore, the apparent weight of the astranaut is 3.591 kN
ANSWER:
3.591 kN
How are testes and ovaries different?
The testicles are the female gonads, whereas the ovaries are the male gonads. The production of gametes is one of the special traits and functions of gonads.
What distinguishes the ovaries and testes?The gonads in males are the testes, whereas those in females are the ovaries. They both work to produce sex hormones and gametes (eggs and sperm). The ovaries are responsible for producing progesterone and estrogen as well as eggs. Sperm and the hormone testosterone are produced by the testes.
What features do ovaries and testes have in common?By secreting steroid hormones and creating gametes, adult testes and ovaries both perform crucial functions in the reproductive system (Hossain et al., 2012). The healthy growth of both the gonadal somatic cells and germ cells is necessary for gonadal functional maintenance and gametogenesis.
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where is thermocouple thermometer used
Explanation:
Thermocouples are used in applications that range from home appliances to industrial processes, to electric power generation, to furnace monitoring and control, to food and beverage processing, to automotive sensors, to aircraft engines, to rockets, satellites and spacecraft.
A spring has a equilibrium length of 0. 100 m. When a force of 40. 0 n is applied to the spring, the spring has a length of 0. 140 m. What is the value of the spring constant of this spring?.
The value of the spring constant of this spring will be 50,000 N/m, which has a equilibrium length of 0.100m applied by 40N force.
Formula for the spring force is given as-
F = (1/2) kx²
where, F = force, k= spring constant and x = change in length of the spring.
Change in length of the spring = Changed length - equilibrium length
Change in length of the spring(x) = 0.140m - 0.100m = 0.040m
Putting the values as F = 40.0 N, x = 0.040m, k =?
F = (1/2) kx²
40 = (1/2) × k × (0.040)²
k = 80/0.0016
k = 50,000 N/m
Hence, the value of the spring constant of this spring will be 50,000 N/m.
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A baby elephant trots in a straight line along river. The horizontal position of the elephant in meters over time is shown below. Questions: 1. What is the displacement of the elephant between 8 s and 24 s ?2. What is the distance traveled by the elephant between 8s and 24s?
looking at the graph,
1) Displacement includes direction
Displacement from 8s to 16s = 15 - 6 = 9
Displacement fbetween 16s and 24s = 0 - 15 = - 15
Displacemet between 8s and 24s = 9 - 15
Displacemet between 8s and 24s = - 6m
2)
Distance does not include direction
from 8s to 16s,
distance travelled = 15 - 6 = 9 m
From 16s to 24s,
distance travelled = 15 - 0 = 15
Total distance between 8s and 24s = 9 + 15
Total distance between 8s and 24s = 24 m
True or false. A small amount of mass can produce a large amount of energy
The satement is true.
This comes from the fact that, according to Einstein:
[tex]E=mc^2[/tex]and since c² is a very large number then, if we find a way to convert all the mass in energy a small amount will produce a large amount of energy.
What is the maximum speed at which a car can safely travel around a circular track of radius 142 meters if the coefficient of friction between the tires and the road is 1.07? Include units in your answer. Answer must be in 3 significant digits.
Given that the radius of the circular path is r = 142 m and the coefficient of the friction is
[tex]\mu=1.07[/tex]The condition for the car to travel safely is
Frictional force = centrifugal force
[tex]\mu mg=\frac{mv^2}{r}[/tex]Here, m is the mass of the car and the acceleration due to gravity is g = 9.8 m/s^2.
v is the maximum speed of the car.
[tex]\begin{gathered} v=\sqrt[]{ugr} \\ =\sqrt[]{1.07\times9.8\times142} \\ =38.58\text{ m/s} \end{gathered}[/tex]Stir the liquid occasionally to release the _______________.
Using the concept of thermodynamics, we got heat as an output when we stir the liquid occasionally.
Actually, according to the Clausius statement of the second law of Thermodynamics: Heat can transfer from a hot body to a cold body, but it cannot transfer from a cold body to a hot body unless any external work has been done on the system.
Thus when you stir a hot liquid, due to the phenomenon of the convection (It is a heat transfer process that can occur only in fluids), part of the heat from the hot liquid goes to the medium which you are stirring (Eg. spoon) and another part of heat flows to the surrounding which is at a room temperature. Thus due to these things heat energy is liberated at a higher rate
But when you went on to stir a cold liquid (let’s say it is at 19 °C), you are giving mechanical work on the system. As mentioned in the second law of Thermodynamics the heat gets transferred from cold liquid to the surrounding air (let's say 30 °C ) due to the work given (stir). But the transfer of heat is very small which could make the liquid warm only to a little amount due to which the temperature of the liquid increases (let’s say it is at 25 °C), and convection (heat transfer process in fluids. In here it is from a cold liquid to at air) also occurs a little amount. So to make this hot even more work has to be done on the system (cold liquid) if the system is closed the work to be done can also be reduced.
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QUESTION 4 A 200 kg rock lies on the surface of a planet with mass, M. The gravitational force, F exerted by the planet on the rock is 1200 N. The radius of the the planet is 700 Calculate the mass, M of the planet
4.4 kg is the mass, M of the planet.
m=200 kg
M=?
F= 1200 N.
r= 700m
G=6.674×10^−11
F=GMm/r²
M=Fr²/Gm
M=5.8×10^8/1.310^−8
M=4.4 kg
Mass is used in physics to express inertia, a fundamental characteristic of all matter. Essentially, it is a mass of matter's resistance to changing its direction or speed in response to the application of a force. The change that an applied force produces is smaller the more mass a body has. The kilogram, the unit of mass in the International System of Units, corresponds to 6.62607015 1034 joule seconds using Planck's constant (SI). One joule is produced by multiplying one kilogram by one square meter per second. The kilogram is determined by exact measurements of Planck's constant since the second and the meter have previously been defined in terms of other physical constants.
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Electron cloud definition
ANSWER:
STEP-BY-STEP EXPLANATION:
[tex][/tex]A climbing chain pulls a roller coaster with a force of 29,738N to the top of the roller coaster 102m high. How many joules of work has it done
Answer:
3,033,276 J
Explanation:
The work can be calculated as
W = Fd
Where F is the force and d is the distance.
Replacing F by 29,738 N and d by 102 m, we get:
W = (29,738 N)(102 m)
W = 3,033,276 J
Then, it has done 3,033,276 J
34. What temperature in the graph below indicates that heat is being used to "break links" binding liquid molecules--that is, the region where the substance is vaporizing?Select one:a. 120°b. 80°c. 60°d. 20°
We know that in a change of state heat is used to break the links between the molecules or atoms of the substance but the temperature remains the same; in the graph shown we notice that we have two portions where the temperature remains constant 20° and 120°. Since vaporizing happens at greater temperature that solid to liquid change of state we conclude that the region where this happens is 120°; therefore, the answer is A.
The energy of the metal d orbitals _________ due to an increase in electrostatic repulsion?.
The energy of the metal d orbitals increases due to an increase in electrostatic repulsion.
What is electrostatic repulsion?Silica nanoparticles that are hydrophilic by themselves are not surface active. However, they establish a potent electrostatic contact with ionic surfactants, which influences the surface behavior of those substances. We describe the interactions between n-heptane and anionic surfactant solutions when hydrophilic silica nanoparticles are present. The utilized particles' sizes are 9 and 30 nm, and the surfactants are sodium dodecyl sulfate (SDS) and dodecyl benzene sulfonic acid (DBSA).
We demonstrate via experimental tensiometry that, in the presence of surfactants, nanoparticles maintain their non-surface-active nature, and that the surface activity of the surfactant directly rises with the concentration of nanoparticles. This phenomenon was explained by the electrostatic repelling contact between the molecules of anionic surfactant and the negatively charged nanoparticles.
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