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Question 43983

posted 10 months ago

A 100 kg mass is dropped from a height of 3.0 m. The kinetic energy before striking the ground is:
,3.0 J------0.30 J-----3000 J------30 J------300 J

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Question 43977

posted 10 months ago

In moving an object of mass 10.0 kg through a distance of 8.0 m, 40.0J of work is done. The average force exerted is:
320 N
80 N
4.0 N
5.0 N

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Question 43982

posted 10 months ago

A mass of 10.0 kg, initially at rest on a horizontal frictionless surface, isacted upon by a horizontal force of 25 N. The speed of the mass afterit has moved 5.0 m is:
10 m/s------250 m/s-----5.0 m/s-----125 m/s----15 m/s

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Question 43981

posted 10 months ago

When a rock is thrown straight up in the air, after it leaves the hand,the rock begins to slow down. This occurs because:
the force of gravity acting on the rock increases as the) rock rises.
the rock is gaining gravitational potential energy as it rises, and thus it must lose kinetic energy.
the gravitational potential energy of the rock decreases as the rock rises.
the forces actingon the rock arebalanced.

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Question 43985

posted 10 months ago

Electrons with a speed of 1.0 x 107 m/s strike the screen of a televisionset. With what kinetic energy does a single electron hit the screen?(mass of electron is 9.11 x 1031 kg)
,4.5 х 10-24J-------------4.6х 10:17 J----------9.0х 10:38 J
9.0 x 10-17----- J9.0 x 10-24 J

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Question 43986

posted 10 months ago

A girl wants to slide down a 'frictionless' playground slide. If she starts at rest from 'X' and slides down to 'Y', which of the following slide shapes will give the girl the greatest possible speed upon reaching 'Y'?All the slides have the same vertical height.
,DC
She gets to the bottom of all the slideswith the same speed.
А--В

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Question 43979

posted 10 months ago

The gravitational potential energy of a bird of mass 2.0 kg on a treebranch of height 15 m is most nearly:
3.0x102 J
3.0x10' J
, 15 J
3.0 J
3.0x103 J

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Question 43978

posted 10 months ago

What is the kinetic energy of a 20 kg object moving at a speed of 10m/s?
100 J
500 J
200 J
2000 J
1000 J

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Question 43980

posted 10 months ago

Two objects have the same mass. One is moving forward twice asfast as the other. The work that must be done to stop the faster objectcompared to the work required to stop the slower object is:
one quarter as great
the same -----two times greater------four times greater----half as great

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Question 43984

posted 10 months ago

A 300 N force is applied horizontally to a 50 kg crate pushing it 2 m.The force of friction between the crate and the floor is 200 N. The magnitude of the work done by the frictional force is:
-600 J-400 J980 J200 J

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