June 2023 Physics Regents Questions 21-30 Question Preview (ID: 62099)

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One example of a force doing work is the force exerted by

a) Earth on a high diver falling toward a pool from a platform above

b) a hook on an engine held stationary above a car

c) a frictionless horizontal air hockey table on a puck moving across the table at a constant velocity

d) a weightlifter on a barbell he holds motionless over his head

A ball falls freely from a rooftop to the street below. The ball starts from rest with 20. joules of gravitational potential energy with respect to the street. The total mechanical energy of the ball just before it hits the street is

a) 0 J

b) 5.0 J

c) 10. J

d) 20. J

Which statement describes the gravitational potential energy (PE), kinetic energy (KE), and internal (thermal) energy (Q), of a wooden crate as it is pushed across a level classroom floor at constant speed?

a) The PE decreases, KE remains the same, and Q decreases.

b) The PE increases, KE increases, and Q decreases.

c) The PE remains the same, KE decreases, and Q increases.

d) The PE remains the same, KE remains the same, and Q increases.

The oscillation of electrons up and down a metal antenna produces waves. These waves are

a) mechanical and longitudinal

b) mechanical and transverse

c) electromagnetic and transverse

d) electromagnetic and longitudinal

What is the angle of reflection?

a) 96°

b) 84°

c) 48°

d) 42°

A characteristic common to both sound waves and x rays is that they both

a) travel fastest in a vacuum

b) cause particles to vibrate in a direction parallel to the wave’s direction of motion

c) transmit energy without transmitting matter

d) are mechanical

Point P in the rope is moving toward the

a) top of the page

b) bottom of the page

c) right

d) left

What is the wavelength of a 300.-hertz sound wave in air at STP?

a) 0.906 m

b) 1.10 m

c) 3.00 × 10^2 m

d) 1.00 × 10^6 m

When the signal from the remote reaches the sensor on the television, the signal will most likely be

a) neither reflected nor absorbed

b) partially absorbed and partially reflected

c) completely reflected

d) completely absorbed

Compared to waves of blue light traveling in a vacuum, waves of red light traveling in a vacuum have

a) a lower frequency and a lower speed

b) a lower frequency and the same speed

c) the same frequency and a lower speed

d) the same frequency and the same speed

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