Answers
ANSWER
122.5N per hand
EXPLANATION
First, we have to draw a free body diagram,
A wheelbarrow is an example of a lever but in this case, both forces are on the same side of the pivot - which is the wheel. To keep the wheelbarrow in balance, the output force, Fo, must be equal to the weight of the wheelbarrow,
[tex]F_o=m\cdot g=100\operatorname{kg}\cdot9.8m/s^2=980N[/tex]Using the mechanical advantage relation between the input and output forces and the lever arms,
[tex]\frac{F_o}{F_i}=\frac{l_i}{l_o}_{}[/tex]We have to find Fi. To solve for Fi, first raise both sides to the exponent of -1 - in other words, flip both fractions,
[tex]\frac{F_i}{F_o}=\frac{l_o}{l_i}[/tex]And multiply both sides by Fo,
[tex]F_i=F_o\cdot\frac{l_o}{l_i}[/tex]The output force is the one found before, 980N. Then, the length of the lever arm of the output force is the distance from the center of gravity to the wheel, 0.5m, and the length of the lever arm of the input force is the distance from the man's hands to the wheel, 2m,
[tex]F_i=980N\cdot\frac{0.5m}{2m}=\frac{980N}{4}=245N[/tex]The total force the man has to make is 245N. Assuming each hand can support the same weight, then each hand should be doing 122.5N of force to keep the wheelbarrow in balance.
Related Questions
Define electricity in detail.
Answers
Electricity is the phenomenon of the flow of electric charges due to the potential difference.
The flow of electric charges across the conductor is known as electric current.
Unit of electric current is Ampere.
Potential difference is the difference of potential between two charges.
There are two charges namely positive and negative.
Uneven distribution of charges causes the potential difference.
Suppose A and B are two points on a conductor where A has a 5 C charge and B has a 3 C charge.
Thus, the current will flow from higher potential to lower potential which is from A to B.
Resistance is the opposing property of the conductor which opposes the flow of current.
The unit of resistance is ohm.
McKenna is performing an experiment. She is testing the relationship between the temperature of water, and how long it takes for rust to form on iron plates. If she finds that higher temperatures lead to lower times for rusting, what is the qualitative relationship?positive correlationno correlationnegative correlationinverse square correlation
Answers
As with the increase in the temperature, the time taken to form the rust on the iron plate decreases.
This correlation is known as a negative correlation.
Thus, the relationship between the temperature of the water and the time taken to form rust on the iron plate is a negative correlation.
Hence, the third option is the correct answer.
Layla was hiking in the Grand Canyon with her best friend Saige. The temperature when they started gut was only 4.0° C. She shouted at the canyon wall and 2.8 s later she heard her own voice echoing back. How far away was the canyon wall? a) 4.6 x 10² m b) 46.6 m c) 47 m d) 466.7 m
Answers
Given:
The temperature of the surrounding is 4 degrees Celsius.
The time taken for the echo to reach the ears is t = 2.8 s
Required:
The distance from the canyon wall.
Explanation:
The distance traveled by the sound is 2d as it travels up to the wall and bounces back.
The distance can be calculated by the formula
[tex]d=\frac{v\times t}{2}[/tex]Here, the speed of sound at 4 degrees Celsius is
[tex]v=331.3\text{ m/s}[/tex]On substituting the values, the distance traveled will be
[tex]\begin{gathered} d=\frac{331.3\times2.8}{2} \\ =4.6\times10^2\text{ m} \end{gathered}[/tex]Final Answer: The distance traveled is 4.6 x 10^2 m
Part 3/3 find the thermal energy transferred. Answer in units of KJ
Answers
0.0We are asked to determine the volume of a gas given the moles, the temperature, and the pressure. To do that, we use the following formula:
[tex]PV=nRT[/tex]Where:
[tex]\begin{gathered} P=pressure \\ V=\text{ volume} \\ n=\text{ number of moles} \\ R=\text{ universal gas constant} \\ T=\text{ temperature} \end{gathered}[/tex]Now, we substitute the values for the final state. Since the process is isothermally this means that the final temperature is the same as the initial temperature. we get:
[tex](1.8atm)V_f=(2mol)(8.31415\frac{J}{Kmol})(243K)[/tex]We need to convert the pressure from atmospheres to Pascals. To do that we use the following conversion factor:
[tex]1atm=101325Pa[/tex]Multiplying by the conversion factor we get:
[tex]1.8atm\times\frac{101325Pa}{1atm}=182385Pa[/tex]Now, we substitute the value in the formula:
[tex](182385Pa)V_f=(2mol)(8.3145\times\frac{J}{Kmol})(243K)[/tex]Solving the operations:
[tex](182385Pa)V_f=4040.847J[/tex]Now, we divide both sides by 182385Pa:
[tex]V_f=\frac{4040.847J}{182385Pa}[/tex]Solving the operations:
[tex]V_f=0.022m^3[/tex]Therefore, the final volume is 0.022 cubic meters.
Part B. We are asked to determine the work done. To do that we will use the formula for isothermic work:
[tex]W=nRT\ln(\frac{P_0}{P_f})[/tex]Where:
[tex]P_0,P_f=\text{ initial and final pressure}[/tex]Now, we plug in the values:
[tex]W=(2mol)(8.31451\frac{J}{Kmol})(243K)\ln(\frac{0.21atm}{1.8atm})[/tex]Now, we solve the operations:
[tex]W=-8681.51J[/tex]Therefore, the work done is -8681.51 Joule. To convert to kilojoules we divide by 1000:
[tex]W=-8681.51J\times\frac{1kJ}{1000J}=-8.68kJ[/tex]Part 3. In an isothermic process the change in internal energy is zero, therefore, according to the first law of thermodynamics we have:
[tex]Q-W=0[/tex]Therefore:
[tex]Q=W[/tex]Therefore, the amount of heat is equal to the amount of work. Therefore, the thermal energy transferred is:
[tex]Q=-8.68kJ[/tex]A mass falls from rest to the growl in 15 secs. Find y, the vertical distance it travelled
Answers
We will determine the distance fallen as follows:
[tex]d=v_it+\frac{1}{2}at^2[/tex]Thus:
[tex]d=(m/s)(15s)+\frac{1}{2}(9.8m/s^2)(15s)^2\Rightarrow d=1102.5m[/tex]So, it traveled 1102.5 meters.
A hair dryer draws 6.0 A when plugged into a 120-V line. (a) What is its resistance? (b) How much charge passes through it in 15 min?
Answers
We will have the following:
a)
[tex]R=\frac{120V}{6A}\Rightarrow R=20\Omega[/tex]b)
[tex]Q=(6A)(15min\ast\frac{60s}{1min})\Rightarrow Q=5400W[/tex]So, the charge is 5400 W in 15 minutes.
Object A has a mass of 3 kg and a velocity of 2 m/s. It collides and sticks to object B which had a mass of 10 kg and a velocity of 1 m/s. How fast will the object AB be moving after the collision?
Answers
Object AB is moving with the velocity of 1.23 m/s.
Givne data:
The mass of object A is m=3 kg.
The velocity of object A is u=2 m/s.
The mass of object B is M=10 kg
The velocity of object B is v=1 m/s.
Applying the conservation of momentum before and after the collision,
[tex]\begin{gathered} mu+Mv=(m+M)V \\ (3)(2)+(10)(1)=(3+10)V \\ V=1.23\text{ m/s} \end{gathered}[/tex]Thus, the object AB moving with a velocity of 1.23 m/s after the collision.
The correct unit for the frequency of oscillation is asecond/wavewave/secondHertzsecond
Answers
To find the unit of frequency.
Explanation:
The SI unit of frequency is Hertz (Hz). It is named after Heinrich Hertz.
It is equivalent to
[tex]\begin{gathered} frequency\text{ =}\frac{1}{time\text{ period}} \\ 1\text{ Hz}=\frac{1}{s} \\ =s^{-1} \end{gathered}[/tex]
it is known that the mass of the earth is 81 times the mass of the moon. show that the point of weightlessness between the earth and the moon for a spacecraft house occurs at √9/10 of the distance to the moon
Answers
If a bullet leaves the muzzle of a rifle with a speed of 600 m/s, and the barrel of the rifle is 0.800 m long, at what rate is the bullet accelerated while in the barrel?That is the question I am having trouble with
Answers
Given that the final velocity of the bullet is
[tex]V_f=600\text{ m/s}[/tex]The initial velocity of the bullet is
[tex]V_i=0\text{ m/s}[/tex]The distance traveled by the bullet is x = 0.8 m
We have to find the acceleration.
Let the acceleration be denoted by a.
The equation which can be used to calculate acceleration is
[tex](V_f)^2-(V_i)^2=2ax[/tex]Substituting the values, acceleration will be
[tex]\begin{gathered} (600)^2-0^2=2\times a\times0.8 \\ a=\frac{360000}{1.6} \\ =225000m/s^2 \end{gathered}[/tex]Thus the acceleration will be 225000 m/s^2.
A wave traveling on a Slinky® that is stretched to 4 m takes 4.97 s to travel the length of the Slinky and back again.(a) What is the speed (in m/s) of the wave? 1.61 m/s b) Using the same Slinky® stretched to the same length, a standing wave is created which consists of seven antinodes and eight nodes. At what frequency (in Hz) must the Slinky be oscillating? Hz =
Answers
Given:
The length of the slinky is: L = 4 m.
The time taken by the wave to travel the length and back again is: t = 4.97 s
To find:
a) The speed of the wave
b) The frequency of the wave
Explanation:
a)
As the wave on the slinky travels along the length and back again, it covers a distance that is double the distance of the slinky.
Thus, the total distance "d" traveled by the wave will be 2L.
The speed "v" of the wave is given as:
[tex]\begin{gathered} v=\frac{d}{t} \\ \\ v=\frac{2L}{t} \end{gathered}[/tex]Substituting the values in the above equation, we get:
[tex]\begin{gathered} v=\frac{2\times4\text{ m}}{4.97\text{ s}} \\ \\ v=\frac{8\text{ m}}{4.97\text{ s}} \\ \\ v=1.61\text{ m/s} \end{gathered}[/tex]Thus, the speed of the wave is 1.61 m/s
b)
The standing wave created consists of seven antinodes and eight nodes. Thus, the length of the slinky is 7/2 times the wavelength of the wave.
[tex]L=\frac{7}{2}\lambda[/tex]Rearranging the above equation, we get:
[tex]\lambda=\frac{2}{7}L[/tex]Substituting the values in the above equation, we get:
[tex]\lambda=\frac{2}{7}\times4\text{ m}=\frac{8\text{ m}}{7}=1.143\text{ m}[/tex]The speed "v" of the wave is related to its wavelength "λ" and a frequency "f" as:
[tex]v=f\lambda[/tex]Rearranging the above equation, we get:
[tex]f=\frac{v}{\lambda}[/tex]Substituting the values in the above equation, we get:
[tex]\begin{gathered} f=\frac{1.61\text{ m/s}}{1.143\text{ m}} \\ \\ f=1.41\text{ Hz} \end{gathered}[/tex]Thus, the frequency of the wave on the slinky is 1.41 Hz.
Final answer:
a) The speed of the wave is 1.61 m/s.
b) The frequency of the oscillation of the slinky is 1.41 Hz.
How do I do this problem? 9.A) A 100 g apple is falling from a tree. What is the impulse that Earth exerts on it during the first 0.5s ofits fall? What about the next 0.5 s?9.B) The same 100 g apple is falling from the tree. What is the impulse that Earth exerts on it in the first0.5 m of its fall? What about the second 0.5 m?9.c) Give a clear explanation for why the answers from 9.a and 9.b are different.
Answers
Given:
The mass of the apple is m = 100g = 0.1 kg
To find (A) the impulse during the first 0.5 s and in the next 0.5 s
(B) Impulse during the first 0.5 m of its fall and about the second 0.5 m.
(C)
Explanation:
(A) The force acting on the apple will be
[tex]\begin{gathered} F=mg \\ =0.1\times9.8\text{ } \\ =\text{ 0.98 N} \end{gathered}[/tex]Impulse during the first 0.5 s will be
[tex]\begin{gathered} Impulse\text{ = 0.98}\times0.5 \\ =0.49\text{ N s} \end{gathered}[/tex]Impulse during the second 0.5 s will be
[tex]\begin{gathered} Impulse\text{ =0.98}\times(0.5+0.5) \\ =0.98\text{ N s} \end{gathered}[/tex](B) The distance traveled by the apple is d = 0.5 m
[tex]\begin{gathered} d1=\frac{1}{2}g(t1)^2 \\ t1=\sqrt{\frac{2d1}{g}} \\ =\sqrt{\frac{2\times0.5}{9.8}} \\ =0.319\text{ s} \end{gathered}[/tex]The velocity will be
[tex]\begin{gathered} v1=gt1 \\ =9.8\times0.319 \\ =3.1262\text{ m/s} \end{gathered}[/tex]The distance traveled by the apple in the second 0.5 m
[tex]\begin{gathered} d2=\frac{1}{2}g(t2)^2 \\ t2=\sqrt{\frac{2d2}{g}} \\ =\sqrt{\frac{2\times0.5}{9.8}} \\ =0.319\text{ s} \end{gathered}[/tex]The velocity will be
'
[tex]\begin{gathered} v2=v1+gt2 \\ =3.1262+(9.8\times0.319) \\ =6.2524\text{ m/s} \end{gathered}[/tex]The impulse will be
[tex]\begin{gathered} Impulse=\text{ change in momentum} \\ =mv2-mv1 \\ =0.1\times(6.2524)-0.1\times(3.1262) \\ =0.62524-0.31262 \\ =0.31262\text{ N s} \end{gathered}[/tex](C) Although the numerical value is the same in both the cases but in part A it is the time and in part B it is the distance.
A 0.86 m tall object is placed 3.35 m away from a lens. If the image is 4.58 m tall, how far away from the lens was the image produced? O
Answers
The magnification is the ratio of the image size to the object size. If the image and object are in the same medium, it is just the image distance divided by the object distance:
[tex]M=\frac{i}{o}[/tex]On the other hand:
[tex]M=\frac{h^{\prime}}{h}[/tex]Where h' is the size of the image and h is the size of the object.
Therefore:
[tex]\frac{h^{\prime}}{h}=\frac{i}{o}[/tex]Substitute h'=4.58m, h=0.86m and o=3.35m to find i, the distance from the lens at which the image is produced:
[tex]\begin{gathered} \Rightarrow i=\frac{h^{\prime}}{h}\cdot o \\ =\frac{4.58m}{0.86m}\cdot3.35m \\ =17.84m \end{gathered}[/tex]Therefore, the image is produced 17.84m away from the lens.
Can you please answer the questions and explain how you got it?
Answers
Given data:
The mass of the block on table is M=500 g.
The hanging mass is m=300 g.
The kinetic friction is μ=0.25.
Part (a)
The free body diagram of the block on table is shown below,
The free body diagram of hanging mass is shown below,
Part (b)
The equation according Newton's second law for 500 g mass will be,
[tex]\begin{gathered} F_{net}=Ma \\ T-f=Ma \\ T-\mu N=Ma \\ T-\mu Mg=Ma \\ T=M(a+\mu g)\ldots\ldots(1) \end{gathered}[/tex]Here, f is the friction force, N is the normal force, and T is the tension in the string.
Part (c)
The equation according Newton's second law for 300 g mass will be,
[tex]\begin{gathered} F_{net}=ma \\ mg-T=ma \\ T=mg-ma \\ T=m(g-a)\ldots\ldots(2) \end{gathered}[/tex]Part (d)
Equating equation (1) and (2) to solve for acceleration,
[tex]\begin{gathered} M(a+\mu g)=m(g-a) \\ 500(a+0.25(9.81))=300(9.81-a) \\ a+2.45=0.6(9.81-a) \\ a+2.45=5.886-0.6a \\ a+0.6a=5.886-2.45 \\ 1.6a=3.436 \\ a=2.14m/s^2 \end{gathered}[/tex]Thus, the acceleration of the blocks are 2.14 m/s².
Part (e)
Substitute the value of acceleration in equation (1) to calculate the tension,
[tex]\begin{gathered} T=M(a+\mu g) \\ T=500(2.14+(0.25)(9.81)) \\ T=2296gm/s^2\times\frac{1\text{ N}}{1000gm/s^2} \\ T=2.296\text{ N} \end{gathered}[/tex]Thus, the tension in the sting is 2.296 N.
A speedboat increases its speed from 13.5 m/s to 27.4 m/s in a distance of 241 m. Determine the time over which this acceleration occurs?
Answers
V² = U² + 2aS
27.4² = 13.5² + 2*241a
750.76 = 182.25 + 482a
750.76 - 182.25 = 482a
568.51/482
a = 1.18m/s^2
Which of the following representsthis number in standard notation?5.05 · 104A. 50500B. 5050C. 0.000505D. 0.0505
Answers
The number is denoted in standard notation is as follows:
[tex]\begin{gathered} Y=5.05\times10^4 \\ Y=5.05\times10000 \\ Y=50500 \end{gathered}[/tex]Thus, the standard notation of this number is 50500.
Thus, the correct option for the above question is A.
If raindrops are falling vertically at 7.90 m/s, what angle from the vertical do they make for a person jogging at 2.47 m/s? (Enter your answer in degrees.)
Answers
17.36 degrees
Explanation
Step 1
Diagram:
so, we have a rigth triangle then let
[tex]\begin{gathered} angle\text{ =}\theta \\ opposite\text{ side= 2.47} \\ adjacent\text{ side =7.9} \end{gathered}[/tex]Step 2
now, we need a function that relates those values to find the missin angle , it is
[tex]tan\theta=\frac{opposite\text{ side}}{adjacent\text{ side}}[/tex]replace ans solve for the angle
[tex]\begin{gathered} tan\theta=\frac{2.47}{7.9} \\ tan\theta=0.31 \\ inverse\text{ tan function in both sides} \\ \tan^{-1}(tan\theta)=\tan^{-1}(0.31) \\ \theta=17.36\text{ \degree} \end{gathered}[/tex]therefore, the answer is
17.36 degrees
I hope this helps you
The binding energy of a nucleus is always negative.Question 4 options:TrueFalse
Answers
ANSWER
False.
EXPLANATION
Nuclear binding energy is the energy that is required to split the nucleus (of an atom) into nucleons: protons and neutrons.
The binding energy of a nucleus is always positive because nuclei require energy to separate them and it is impossible for nuclei to gain energy by being separated.
Therefore, the answer is false.
Hey there, I have a physics question that sadly I can't figure out since the pearson e book keeps crashing. Also I am blind and CAN'T SEE PICTURES OR GRAPHS!! So for the question: Let θ be the angle that the vector A⃗ makes with the +x-axis, measured counterclockwise from that axis. Find the angle θ for a vector that has the following components.Part AAx= 4.20 m, Ay= -2.10 mExpress your answer in degrees.
Answers
ANSWER:
333.4°
STEP-BY-STEP EXPLANATION:
To find angle for a vector:
[tex]\theta=\tan ^{-1}\mleft(\frac{A_y}{A_x}\mright)[/tex]We substitute the values of this case and the angle would then be:
[tex]\begin{gathered} \theta=\tan ^{-1}\mleft(\frac{-2.10}{4.20}\mright) \\ \theta=\tan ^{-1}(-0.5) \\ \theta=-26.56\cong-26.6 \\ \theta=360-26.6 \\ \theta=333.4\text{\degree} \end{gathered}[/tex]The angle is 333.4°
In this example, the system gains the ability to cause change the higher the brick is raised above the earth. Is this true or false?
Answers
ANSWER
True
EXPLANATION
The higher the brick is, the more potential energy it has. Therefore, it is true that it gains the ability to cause change the higher it is raised above the Earth.
Q4. A 5.0-kg bowling ball rolls down africtionless 2.5 m tall ramp and strikes astationary mass at the bottom of the ramp in aperfectly elastic collision. To whatheight back up the ramp does the first bowlingtravel after the collision ita) the stationary mass is also 5.0 kgb) the stationary mass is 10.0 kgC) the stationary mass is 500.00 kg
Answers
a)
Using conservation of energy for ball 1:
[tex]\begin{gathered} E1=E2 \\ K1+U1=K2+U2 \\ 0+m1gh=\frac{1}{2}m1v1^2 \end{gathered}[/tex]Solve for v1:
[tex]\begin{gathered} v1=\sqrt[]{2gh} \\ v1=\sqrt[]{2(9.8)(2.5)} \\ v1=7\frac{m}{s} \end{gathered}[/tex][tex]v1=v2^{\prime}-v1^{\prime}[/tex]Using conservation of momentum:
[tex]\begin{gathered} m1v1=m1(v2^{\prime}-v1^{\prime})+m2v2^{\prime} \\ v2^{\prime}=\frac{2m1v1}{(m1+m2)} \\ \end{gathered}[/tex]a)
m2 = 5 kg
[tex]v2^{\prime}=7\frac{m}{s}[/tex]so:
[tex]\begin{gathered} v1^{\prime}=7-7 \\ v1^{\prime}=0 \end{gathered}[/tex]so:
[tex]\begin{gathered} m1gh^{\prime}=\frac{1}{2}m1(v1^{\prime})^2 \\ h^{\prime}=0 \end{gathered}[/tex]If the stationary mass is 5.0 kg the height back up the ramp is 0 meters
b)
m2 = 10
[tex]v2^{\prime}=\frac{14}{3}\frac{m}{s}[/tex]so:
[tex]v1^{\prime}=-\frac{7}{3}\frac{m}{s}[/tex][tex]\begin{gathered} m1gh^{\prime}=\frac{1}{2}m1(v1^{\prime})^2 \\ h^{\prime}\approx0.2778m \end{gathered}[/tex]If the stationary mass is 10.0 kg the height back up the ramp is 0.2778 meters
c)
m2 = 500.00kg
[tex]v2^{\prime}=\frac{14}{101}\frac{m}{s}[/tex]so:
[tex]v1^{\prime}\approx-\frac{693}{101}\frac{m}{s}[/tex][tex]\begin{gathered} m1gh^{\prime}=\frac{1}{2}m1(v1^{\prime})^2 \\ h^{\prime}\approx2.4m \end{gathered}[/tex]If the stationary mass is 500.0 kg the height back up the ramp is 2.4 meters
The frequency of a sound wave changes if the source of the sound is moving relative to the listener. What is this called?
Answers
Given
The frequency of a sound wave changes if the source of the sound is moving relative to the listener.
To find
What is this called?
Explanation
For an observer, when any source of sound is moving towards it or away from it then the sound becomes higher and lower respectively.
Thus the moment of the source changes the frequency of the sound. This is known as doppler effect.
Conclusion
The given effect is known as Doppler effect.
A full tea cup has a mass of 0.40 kg. If the full cup applies a pressure of 1000.the radius of the circular ring imnrinted on the table?
Answers
Given:
The mass of the cup, m=0.40 kg
The pressure applied by the cup, P=1000 N/m²= 1000 Pa
To find:
The radius of the ring imprinted on the table.
Explanation:
The pressure is defined as the force per unit area.
Thus the pressure applied by the cup is given by,
[tex]\begin{gathered} P=\frac{F}{A} \\ =\frac{mg}{\pi r^2} \end{gathered}[/tex]Where A is the area of the ring, g is the acceleration due to gravity, and r is the radius of the ring.
On rearranging the above equation,
[tex]r=\sqrt{\frac{mg}{P\pi}}[/tex]On substituting the known values,
[tex]\begin{gathered} r=\sqrt{\frac{0.40\times10}{1000\pi}} \\ =0.036\text{ m} \\ =3.6\text{ cm} \end{gathered}[/tex]Final answer:
Thus the radius of the ring imprinted on the table is 3.6 cm
Therefore the correct answer is option 3.
Two large parallel plates are 17 cm apart and have equal but opposite charges on the surfaces facing each other. An electron is placed half way between the plates. Find the potential difference between the plates if the force on the electron is 5.2×10^(−15) N .
Answers
The potential difference between the plates is equal to 5525 V if the force on the electron is 5.2 ×10⁻¹⁵N.
What is the formula for the electric field of a capacitor?The magnitude of the electric field of the parallel plate capacitor can be calculated from the formula given below:
E = F /q
Where E is the electric field, q is the charge on the electrons and F is the force.
Given the distance between plates, d = 17 cm = 0.17 m
The force, F = 5.2 ×10⁻¹⁵ N, q = 1.6 × 10⁻¹⁹ C
E = 5.2 ×10⁻¹⁵/1.6 × 10⁻¹⁹
E = 32500 N/C
The potential difference , V = E × d
V = 32500 × 0.17
V = 5525 V
Learn more about electric field, here:
https://brainly.com/question/26409781
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- (True/False) If there is no friction, the efficiency of a machine can be greater than 100%.
Answers
ANSWER:
False
STEP-BY-STEP EXPLANATION:
Even without friction, the efficiency cannot be greater than 100%, because the output cannot be greater than the input, therefore, the statement is false.
wut is phisics\and what do the do in physica
Answers
Physics is the branch of science that deals with the energy and matter and how they are relate to each other. Physics is simply as a natural science that depends on the approximation, measurements and mathematical analysis.
Two spherical objects have masses of 1.5 x 105 kg and 8.5 x 102 kg. Their centers are separated by a distance of 2500 m. Find the gravitational attraction between them.
Answers
Given data
*The mass of the first spherical object is m = 1.5 × 10^5 kg
*The mass of the second spherical object is M = 8.5 × 10^2 kg
*The separated distance between the two spherical objects is r = 2500 m
The expression for the gravitational attraction between them is given as
[tex]F=\frac{GmM}{r^2}[/tex]*Here G = 6.67 × 10^-11 N.m^2/kg^2 is the value of the gravitational constant
Substitute the known values in the above expression as
[tex]\begin{gathered} F=\frac{(6.67\times10^{-11})(1.5\times10^5)(8.5\times10^2)}{(2500)^2} \\ =1.36\times10^{-9}\text{ N} \end{gathered}[/tex]Hence, the gravitational attraction between them is F = 1.36 × 10^-9 N
A block of mass of 1kg is hit by a force of magnitude 5 N which causes the block to have an acceleration of magnitude a. If the same block is hit by a force of magnitude 40 N, then which of these is the new magnitude of acceleration of the block?A) 2.8284aB) one eighth of aC) one/ 64 of aD) 8aE) 64a
Answers
The acceleration is related to the force and mass by Newton's second law which states:
[tex]a=\frac{F}{m}[/tex]for the first mass we have:
[tex]a_1=\frac{5}{1}=5[/tex]If the same block is hit by a force of 40 N then the new acceleration is:
[tex]a=\frac{40}{1}=40[/tex]Which is eight times the original acceleration; therefore, the answer is D.
An escalator is used to move 20 passengers every 60s from the first floor of a department store to the second. The second floor is located above the first floor. The average passenger's mass is 54.9 kg. Determine the power requirement of the escalator in order to move this number of passengers in this amount of time
Answers
From the information given,
The average passenger's mass is 54.9 kg
Force exerted by each passenger = weight of passenger = mg
where
m = mass = 54.9
g = acceleration due to gravity = 9.8m/s^2
Force = weight = 54.9 x 9.8 = 538.02 N
We would determine the work done in moving one passenger. The formula for calculating work is
work = force x distance
distance = 5.2
Work = 538.02 x 5.2 = 2797.704 J
Work done in moving 20 passengers = 2797.704 x 20 = 55954.08
Recall,
Power = work/time
Given that time = 60s,
Power = 55954.08/60
Power = 933 W
the power requirement of the escalator in order to move this number of passengers in this amount of time is 933 W
y=a on x Represents_____________
Answers
Answer:
a
Explanation:
to be linear equation, x needs to be multiplied by a constant but xy = a doesn't satisfy that