Raindrops are falling straight downward. When observed from a car traveling at 55.0 mi/h, the drops streak the side window at an angle of 60.0° with the vertical. Find the speed with which the drops are falling
31.8 mi/h
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When a spinning object changes its size, its rotation rate
A. remains the same. B. always decreases. C. always increases. D. increases or decreases, depending on whether it shrinks or expands.
An initially uncharged parallel plate capacitor of capacitance C is charged to potential V by a battery. The battery is then disconnected. Which statement is correct?
A. There is no charge on either plate of the capacitor. B. The capacitor can be discharged by grounding any one of its two plates. C. Charge is distributed evenly over both the inner and outer surfaces of the plates. D. The magnitude of the electric field outside the space between the plates is approximately zero. E. The capacitance increases when the distance between the plates increases.
Two balls, one of radius R and mass M, the other of radius 2R and mass 8M, roll down an incline. They start together from rest at the top of the incline. Which one will reach the bottom of the incline first?
A) The small sphere B) Both reach the bottom together. C) The large sphere D) It depends on the height of the incline. E) It depends on the length of the inclined surface.
A child pulls on a wagon with a force of 75N. If the wagon moves a total of in what is the average power delivered by the child?
A) 17 W B) 21 W C) 22 W D) 26 W