A wheel rotates through an angle of 13.8 rad as it slows down uniformly from 22.0 rad/s to 13.5 rad/s. What is the magnitude of the angular acceleration of the wheel?
A) 0.616 rad/s2
B) 5.45 rad/s2
C) 111 rad/s2
D) 22.5 rad/s2
E) 10.9 rad/s2
E
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Objects A and B are made of the same substance, but object A is twice as massive as object B. Object A originally has a temperature of 100°C and B has a temperature of 0°C. Suppose these objects are put inside a well-insulated cup and are allowed to come to a common temperature Tf . What is that temperature? Select the closest answer.
A. 75°C B. 67°C C. 50°C D. 33°C E. 25°C
A 2.0-kg mass is projected vertically upward from ground level with an initial speed of 30 m/s. The mass rises to a maximum height of 35 m above ground level. What is the change in mechanical energy of the mass caused by air resistance between the point of projection and the point of maximum height?
a. ?0.21 kJ b. ?0.47 kJ c. ?0.40 kJ d. ?0.34 kJ e. ?0.69 kJ
Particle A has twice the charge of nearby particle B. Compared to the force on Particle A, the force on Particle B is
A) half as much. B) the same. C) twice as much. D) four times as much. E) none of the above
A body in a room at 300 K is heated to 3,000 K. The amount of energy radiated each second by the body increases by __________
Fill in the blank(s) with correct word