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When 150 joules of work is done on a system by an external force of 15 newtons in 20. seconds, the total energy of that system increases by
electrons from her hair to the comb
1.5 x 10^2 J
energy and time
decreases and his kinetic energy remains the same
19 N
Velocity is zero and acceleration is nonzero.
0.18 m
57 m northeast
A spring with a spring constant of 68 newtons per meter hangs from a ceiling. When a 12-newton downward force is applied to the free end of the spring, the spring stretches a total distance of
electrons from her hair to the comb
1.5 x 10^2 J
energy and time
decreases and his kinetic energy remains the same
19 N
Velocity is zero and acceleration is nonzero.
0.18 m
57 m northeast
A ball is thrown straight upward from the surface of Earth. Which statement best describes the ball’s velocity and acceleration at the top of its flight?
electrons from her hair to the comb
1.5 x 10^2 J
energy and time
decreases and his kinetic energy remains the same
19 N
Velocity is zero and acceleration is nonzero.
0.18 m
57 m northeast
As a student runs a plastic comb through her hair, the comb acquires a negative electric charge. This charge results from the transfer of
electrons from her hair to the comb
1.5 x 10^2 J
energy and time
decreases and his kinetic energy remains the same
19 N
Velocity is zero and acceleration is nonzero.
0.18 m
57 m northeast
As a student walks downhill at constant speed, his gravitational potential energy
electrons from her hair to the comb
1.5 x 10^2 J
energy and time
decreases and his kinetic energy remains the same
19 N
Velocity is zero and acceleration is nonzero.
0.18 m
57 m northeast
The horizontal component of the force acting on the crate is
electrons from her hair to the comb
1.5 x 10^2 J
energy and time
decreases and his kinetic energy remains the same
19 N
Velocity is zero and acceleration is nonzero.
0.18 m
57 m northeast
Which pair of quantities represent scalar quantities?
electrons from her hair to the comb
1.5 x 10^2 J
energy and time
decreases and his kinetic energy remains the same
19 N
Velocity is zero and acceleration is nonzero.
0.18 m
57 m northeast
A sailboat on a lake sails 40. meters north and then sails 40. meters due east. Compared to its starting position, the new position of the sailboat is
electrons from her hair to the comb
1.5 x 10^2 J
energy and time
decreases and his kinetic energy remains the same
19 N
Velocity is zero and acceleration is nonzero.
0.18 m
57 m northeast
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