A player catches a ball. Consider the action force to be the ball against the player's glove. The reaction is the
A) player's grip on the glove.
B) force of the glove on the ball.
C) friction of the ground against the player's shoes.
D) muscular effort in the player's arms.
E) none of the above
Answer: B
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You find a rock containing radioactive potassium-40 and its decay product argon-40. You assume that all the argon-40 was made from radioactive decay of potassium-40. The rock now has twice as much argon-40 as potassium-40; that is, 2/3 of the original potassium-40 has decayed into argon-40, whereas 1/3 remains in the rock. Based on this graph, about how old is the rock?
A) 1 billion years B) 1.25 billion years C) 2 billion years D) 2.5 billion years
What is the net power that a person loses through radiation if her surface area is 1.20 m2, if her emissivity is 0.895, if her skin temperature is 300 K, and if she is in a room that is at a temperature of 17°C?
The Stefan-Boltzmann constant is 5.670 × 10-8 W/m2 · K4. A) 60.3 W B) 62.6 W C) 65.7 W D) 68.4 W E) 64.8 W
A 1.0-mm diameter extension cord is made of metal having a resistivity of 1.68 × 10-8 ? ? m. When it carries a current of 15 A, what is the potential difference between two points in the cord that are 100 m apart?
A) 12 V B) 23 V C) 32 V D) 41 V
In a two-body collision, if the kinetic energy of the system is conserved, then which of the following best describes the momentum after the collision?
a. must be less c. may also be conserved b. must also be conserved d. is doubled in value