A miniature spring-loaded, radio-controlled gun is mounted on an air puck. The gun's bullet has a mass of 7.00 g, and the gun and puck have a combined mass of 150 g. With the system initially at rest, the radio controlled trigger releases the bullet causing the puck and empty gun to move with a speed of 0.530 m/s. What is the bullet's speed?
a. 83.2 m/s
b. 75.7 m/s
c. 12.4 m/s
d. 11.4 m/s
e. 296 m/s
d
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Is it possible to have a zero electric field value between a negative and positive charge along the line joining the two charges?
A) Yes, if the two charges are equal in magnitude. B) Yes, regardless of the magnitude of the two charges. C) No, a zero electric field cannot exist between the two charges. D) cannot be determined without knowing the separation between the two charges E) cannot be determined without knowing the magnitude of the charges
Rotational Kinetic Energy: What is the kinetic energy of a 120-cm thin uniform rod with a mass of 450 g that is rotating about its center at 3.60 rad/s?
A. 0.350 J B. 4.20 J C. 0.700 J D. 0.960 J E. 2.10 J
Why is a planet's thermosphere warm?
A) It absorbs x-rays. B) It absorbs infrared light. C) It absorbs visible light. D) It contains greenhouse gases. E) It absorbs ultraviolet light.
Katelyn runs along the aisle of a train that moves at 8 m/s. Her speed relative to the floor is 3 m/s. Her speed relative to an observer at rest on the ground is
A) 5 m/s. B) 11 m/s. C) either depending on her running direction D) none of the above