2.3.6 Quiz: Energy and Sustainability Question 8 of 10
A lamp has a power of 120 W and is left on for 24 hours. A television has a
power of 350 W and is left on for 3 hours. Which statement correctly
compares the energy used by these devices?
A. The television uses 6,588,000 J less than the lamp.
B. The television uses 3,780,000 J less than the lamp.
C. The television uses 10,368,000 J more than the lamp.
D. The television uses 2,356,000 J more than the lamp.

An athlete swings a ball, connected to the end of a chain, in a horizontal circle. the athlete is able to rotate the ball at the rate of 8.13 rev/s when the length of the chain is 0.600 m. when he increases the length to 0.900 m, he is able to rotate the ball only 6.04 rev/s. (a) which rate of rotation gives the greater speed for the ball? 6.04 rev/s 8.13 rev/s (b) what is the centripetal acceleration of the ball at 8.13 rev/s? m/s2 (c) what is the centripetal acceleration at 6.04 rev/s? m/s2