Answer:
very smooth and polished glass mirror
Explanation:
The best type of mirror for this would be a very smooth and polished glass mirror. A metal mirror will also work but it would need to be extremely polished. This would allow light to efficiently be reflected across the room, thus effectively adding an "extra" light source to the room. If the mirror is not smooth then the light may become distorted and not reflect properly as it is supposed to. This may defeat the entire purpose of the mirror for this scenario.
A woman hikes 2.5 kilometers in 30 minutes, and then 3 kilometers in 20 minutes, and finally 2 kilometers in 10 minutes. What was her average speed?
Answer:
7.5 kph
Explanation:
2.5+3+2=7.5
32. Increasing the amplitude of a sound wave produces a
sound with
1. lower speed
2. higher pitch
3: shorter wavelength
4. greater loudness
Answer:
4
Explanation:
because amplitude of a sound wave is related to loudness of the sound, so the higher the amplitude, the louder the sound
hope this helps
Speed = Distance Time Velocity = 1. Find the velocity of a truck that travels 75miles north in 2.5 hours? List: Equation: Substitution: Answer with units:
Answer:
187.5 m/s (i think)
Explanation:
If you use the formula V= T times displacement you can find this out by doing the following-
Displacement equals 75 m
T equals 2.5 hrs
75x2.5= 187.5
and since velocity is measured in m/s, it becomes
187.5 m/s
A body vibrates 100 times in 20 seconds. Find its frequency and time period.
plz answer this its urgent
Answer:
Vibrates 5 times a / every second
Explanation:
As Clinton walks he pushes his shoe against the track.
Which of the following best describes the reaction force to Clinton's shoe pushing against the track?
OA. The track pushes back on Clinton's shoe with the same force.
ОВ.
The track pushes in the same direction as Clinton's shoe with the same force.
OC. The track pushes against gravity with the same force.
The track pushes in a different direction with a different force.
Answer:A:The track pushes back on Clinton's shoe with the same force.
Explanation:According to Newton's third law of motion, for every action force there is an equal and opposite reaction force. In this case, the action force is Clinton's shoe pushing on the track. As this happens, there is an equal and opposite reaction force in which the track pushes back on Clinton's shoe with the same force.
What is the study of economics?
Answer:
Economics is the study of how societies use scarce resources to produce valuable commodities and distribute them among different people.
Explanation:
The ultimate goal of economic science is to improve the living conditions of people in their everyday lives.
Hope this helps!
Answer:
the branch of knowledge concerned with the production, consumption, and transfer of wealth. (basically the study of money and not just banks but how it effects the world)
Explanation:
West
East
<
디
50 Newtons
40 Newtons
What is the net force on the box?
А
10 Newtons West
B
10 Newtons East
с
90 Newtons West
D
90 Newtons East
A . 10 Newton West
that's my Answer
Which is not a measurement of effort for exercises or activity?
repetitions
time
distance
elevation
PLS ANSWER FAST WILL GIVE BRAINLY!!!
In order for a roller coaster to work, why does the hill the cart climbs need to be higher than the top of the loop?
Answer:
The concept of potential energy, often referred to as energy of position, is very simple: As the coaster gets higher in the air, gravity can pull it down a greater distance. ... The potential energy you build going up the hill can be released as kinetic energy — the energy of motion that takes you down the hill.
Potential energy, also known as energy of position, is a pretty straightforward idea. As the roller coaster rises in the air, gravity has a greater ability to pull it down.
What does the hill the cart climbs need?An easy illustration involves a stopped car at the summit of a hill. The car drives faster as it goes down the hill, which results in an increase in kinetic energy and a decrease in potential energy. The vehicle changes kinetic energy into potential energy as it ascends the hill.
They are higher up at the top of the hill, thus they have more potential energy. Moving down a slope transforms potential energy into kinetic energy, while moving up a hill transforms kinetic energy into potential energy.
Therefore, You can release the potential energy you accumulate while climbing a hill as kinetic energy, which is the energy of motion that propels you down the hill.
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How long will it take for a basketball spinning on someone’s finger to stop if it undergoes and angular acceleration of -0.15 rad/s and is traveling at 27 rad/s initially? How many revolutions will it make?
The basketball's angular velocity ω at time t is
ω = 27 rad/s + (-0.15 rad/s²) t
It comes to a stop when ω = 0, which happens for
0 = 27 rad/s - (0.15 rad/s²) t
t = (27 rad/s) / (0.15 rad/s²)
t = 180 s
In this time, the ball would undergoes an angular displacement θ of
θ = (27 rad/s) t + 1/2 (-0.15 rad/s²) t ²
Plug in t = 180 s and solve for θ :
θ = (27 rad/s) (180 s) - 1/2 (0.15 rad/s²) (180 s)² = 2430 rad
One complete revolution corresponds to a turn of 2π rad, so the ball makes
(2430 rad) / (2π rad/rev) ≈ 386.747 rev
or about 387 revolutions as it slows down.
Elements with positive valences usually ______ electrons
A. Donate
B. Accept
C. Have no
D. Create
is boiling water in a kettle on a stove kinetic or potential energy?
Answer:
Boiling a kettle is an example of both thermal and kinetic energy. Thermal energy comes from a substance whose molecules and atoms are vibrating faster due to a rise in temperature. Heat energy is another name for thermal energy. Kinetic energy is the energy of a moving object.
it's kinetic!
7.
Examine the table provided.
Object
Mass
Acceleration
Basketball
0.45 kg
5 m/s2
Football
0.30 kg
100 m/s2
Racquetball
0.01 kg
50 m/s2
Golf Ball
0.02 kg
10 m/s2
Which of the objects is producing the greatest force?
A
Basketball
B
Football
с
Racquetball
D
Golf ball
i have finals! pls help
(2). a = v/t
but v =s/t
a =s/t÷t
a=s/t×t
a=s/t²
a=220/5.21²
a=8.10m/s²
Explanation:
For the question 1, just imput the value of t into the equation
Which of the following terms are needed to completely describe speed?
Check all that apply.
A. Direction
B. Units
C. Mass
D. Number
Answer: c. and a
Explanation:
A wave frequency of 440 Hz travels through a medium at 343 m/s. Calculate the wavelength
for this wave.
150,920 m
1.28 m
97 m
0.078 m
Answer:
0.78 m
Explanation:
us the formula
speed = frequency x wavelength
343 = 440 x wavelength
343 / 440 = wavelength
wavelength = 0.78 m
I think the last option, you wrote wrongly, it is supposed to be 0.78 not 0.078 .
if you think I am wrong please do tell me, I will redo this.
hope this helps
A box weighs 25N. How much mass does it have?
Explanation:
If box weight 25N on ground
MA=F
M(10)=25
M=2.5Kg
4. Where would a tsunami be most likely to occur?
a. Cuba
coast of Ireland
b. New York City
d. Indonesia
Answer:
D. Indonesia
Explanation:
Indonesia's high frequency of tsunamis, due to its location along the Pacific Ring if Fire
What is momentum? And it’s types?
Answer:
Momentum is the product of mass and velocity. The two types of momentum are angular and linear.
Explanation:
Answer:
Explanation: (Momentum is mass * velocity. Its units, in the SI system are kilogram meter per second) What is Inertia?
In physics, momentum is the product of mass and velocity. The greater the product of this equation, the greater the momentum. In science, there are two types of momentum: angular and linear, which concern different types of moving objects. However, that is not where the definition stops. The word momentum is also used as part of everyday speech, and is one of the very few physics concept whose metaphorical definition is the same as its actual one.
I HOPE THIS ANSWER WILL HELP YOU!!!
how are electromagnetic waves produced
Answer:
Electromagnetic waves are created by oscillating charges (which radiate whenever accelerated) and have the same frequency as the oscillation. Since the electric and magnetic fields in most electromagnetic waves are perpendicular to the direction in which the wave moves, it is ordinarily a transverse wave.
Answer: Electromagnetic waves are the combination of electric and magnetic field waves produced by moving charges.
The creation of all electromagnetic waves begins with a charged particle. This charged particle creates an electric field (which can exert a force on other nearby charged particles). When it accelerates as part of an oscillatory motion, the charged particle creates ripples, or oscillations, in its electric field, and also produces a magnetic field (as predicted by Maxwell’s equations).
Once in motion, the electric and magnetic fields created by a charged particle are self-perpetuating—time-dependent changes in one field (electric or magnetic) produce the other. Both electric and magnetic fields in an electromagnetic wave will fluctuate in time, one causing the other to change.
Electromagnetic waves (photons) are produced anytime a charged particle experiences a change in velocity.. The electromagnetic wave (radiation) that is produced when the charge particle changes it’s velocity is how energy is conserved. This energy is light.
Hope this helps have a awesome day/night❤️✨
Explanation:
Hey guys I need help please help me what do y’all think it is I need help And I’m struggling
Wave A has a frequency of 1.6 Hz, and Wave B has a frequency of 3.2 Hz. If Wave A has a wavelength of 1.0m, what do you expect will be the wavelength of Wave B?
OPTIONS:
A) 2.0m
B) 1.0m
C) 0.50m
D) 0.25m
Answer:
C
Explanation:
A- velocity=wavelength*frequency
velocity=1.0*1.6.......=1.6 m/s
B- wavelength=velocity/frequency
wavelength=1.6/3.2.....=0.5 meters
A 540 kg satellite moves through deep space with a speed of 27 m/s. A booster rocket on the satellite fires for 1.4 s, giving a force to the satellite. The speed of the rocket increases to 31 m/s. Calculate the force given by the booster rocket to the satellite. (Assume that the mass of the satellite remains constant.)
A)1543 N
B)2160 N
C)11,957 N
D)3024 N
Answer: a
Explanation: because the answer is 1.4444444 and that's the closest
Why does the first row in our periodic table
only have two elements?
A) because each orbital in every sub-level only holds
two electrons
B) because Bohr only knew about two elements
C) because the first energy level only holds two
electrons total
Help me plssss
Answer:
B
Explanation:
♡ ∩_∩
（„• ֊ •„)♡
┏━∪∪━━━━┓
Hopes this helps
♡ good luck 。 ♡
┗━━━━━━━┛
Answer:
C option is correct
Explanation:
C) because the first energy level only holds two electrons.
What do the arrows in this photograph represent?
A. Gravity and air resistance
B. An action-reaction force pair
C. A pair of unbalanced forces at work
D. Friction and air resistance
Answer: B An action-reaction force pair
Explanation: Took the exam
The arrows in this photograph represent: An action-reaction force pair. Hence, option (B) is correct.
What is action-reaction force pair?When two bodies interact, they exert an equal and opposite force on one another in accordance with Newton's third law of motion. Action-reaction forces are made up of these forces.
"When one body exerts a force on the other body, the first body experiences a force that is equal in magnitude in the opposite direction of the force which is exerted," according to Newton's third law of motion.
According to the above assertion, there are always two forces operating on the objects involved in an interaction. The forces are of identical magnitude, but the direction of the force acting on the first object is different from the direction acting on the second.
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How do you get on the cheer squad?!
Answer:
you don't cuz cheerleaders only get in the way of the football game
What type of Circuit do they use in a home? WHY ? (Simple circuit / Parallel circuit / Series circuit)
Answer:
Parallel Circuits
Explanation:
Loads can be operated on their own. If you had a series circuit, adding another light would dim the rest!
Think of one obstacle that you know YOU CAN, YOU WILL, & YOU MUST overcome.
Answer:
myself tbh
Explanation:
hope this helps
Answer: Depression and myself, love life
Hope this helps have a awesome day❤️✨Explanation:
Some students found this information about an energy saving lamp and a filament lamp that give out almost the same amount of light.
Describe the advantages and disadvantages of each type of lamp.
Answer:
By replacing your home's five most frequently used light fixtures or bulbs with models that have earned the ENERGY STAR, you can save $75 each year.
Compared to traditional incandescents, energy-efficient lightbulbs such as halogen incandescents, compact fluorescent lamps (CFLs), and light emitting diodes (LEDs) have the following advantages:
Typically use about 25%-80% less energy than traditional incandescents, saving you money
Can last 3-25 times longer.
Which type of earthquake waves are responsible for most of the damage caused by an earthquake? Why?
please helppppp its due tomorrow
Answer:
Surface waves travel along the surface. There are two types of body waves: P-waves travel fastest and through solids, liquids, and gases; S-waves only travel through solids. Surface waves are the slowest, but they do the most damage in an earthquake.
Answer:
surface waves
Explanation:
they have the strongest vibration and can cause the most damage