11. A marble of mass m rolls with initial speed v down a long, horizontal hallwa
ID: 1396982 • Letter: 1
Question
11.
A marble of mass m rolls with initial speed v down a long, horizontal hallway. Eventually, the marble comes to a stop. How much work has friction performed on the marble?
-0.5mv2
0.5mv2
-mv2
mv2
12.
Which item has elastic potential energy?
a rubber ball rolling on the floor
a stick of dynamite
a roller coaster car on top of a large hill
a spring in a loaded mousetrap
13.
A woman bowls a bowling ball with initial speed v. The ball rolls up a steep ramp, comes to a stop, and then rolls back to the woman's position. Assuming that the force of friction on the ball is small but significant, with what speed is the ball traveling when it returns to the woman?
a speed close to zero
a speed exactly equal to v
a speed slightly greater than v
a speed slightly less than v
14.
Which of the following would not be described as having elastic potential energy?
a falling rock
a squeezed spring
an arrow pulled back in a bow
a stretched bungee cord
15.
A cannonball is launched at height 1.0 m above a flat surface. It travels with an initial velocity of 35 m/s at an angle of 45 degrees to the horizontal. By applying the work-energy theorem, what can be predicted about the cannonball or its trajectory?
the mass of the cannonball
the maximum height of the cannonball
the distance that the cannonball travels through the air
the length of time in which the cannonball is in the air
16.
What is potential energy?
energy associated with position or shape
energy produced by moving electric charges
energy transferred as waves
energy related to motion
17.
Weightlifers A and B each take 2.0 s to lift a barrel from the floor to a certain height. The barrel lifted by weightlifter A has mass 100 kg, while the barrel lifted by weightlifter B has mass 180 kg. Let P be the the power generated by weightlifter A. What power was generated by weightlifter B?
0.90P
1.8P
P
2.0P
18.
A 12.0-g rock is placed in a slingshot with a spring constant of 200 N/m. The rock is stretched back 0.500 m. After the slingshot is fired, what is the maximum velocity of the rock?
0.600 m/s
25.0 m/s
64.5 m/s
82.1 m/s
19.
The graph shows the magnitude of the force exerted by a given spring as a function of the distance x the spring is stretched, measured in centimeters. How much work is needed to stretch the spring a distance of 5.0 cm from its equilibrium position?
9.4 J
6.3 J
12.6 J
15 J
20.
At a department store, a toy train travels on a loop of track of length 14 m. The coefficient of rolling friction between the train's wheels and the track is 0.10, and the weight of the train is 65 N. How much work does the train do against friction during each trip around the loop?
0 J
4.1 J
91 J
180 J
11.
A marble of mass m rolls with initial speed v down a long, horizontal hallway. Eventually, the marble comes to a stop. How much work has friction performed on the marble?
-0.5mv2
0.5mv2
-mv2
mv2
12.
Which item has elastic potential energy?
a rubber ball rolling on the floor
a stick of dynamite
a roller coaster car on top of a large hill
a spring in a loaded mousetrap
Explanation / Answer
11. -0.5mv2 because kinectic energy of marble converted into work done by friction force and it will be negative work done.
12. a spring in a loaded mousetrap
13.a speed slightly less than v
14.a falling rock
15.the maximum height of the cannonball
16.energy associated with position or shape
17. PA= W/t=mgh/t=100*9.8*h/2=490h
hence P=490h..................(1)
now PB=W/t=mgh/t=180*9.8*h/2=882h
hence from eq 1 PB=882*P/490=1.8P option B is correct.
18. elastic potential energy = kinetic energy
0.5 k.x2= 0.5 m.v2
200*0.5*0.5=0.012*v2
solving this we get v=64.5m/s
19.graph missing
20. W= fk*s=uN*s=0.10*65*14=91J.
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