Author Question: An electric car is designed to run off a bank of 12-V batteries with total energy storage of 6.0 ... (Read 97 times)

crobinson2013 · **on:** Jul 28, 2018

An electric car is designed to run off a bank of 12-V batteries with total energy storage of 6.0 107 J. If the electric motor draws 6000 W in moving the car at a steady speed of 10 m/s, how far will the car go before it is out of juice?
a. 150 km
c. 100 km
b. 50 km
d. 25 km

Question 2

A figure skater on ice with arms extended, spins at a rate of 3.5 rev/s. After he draws his arms in, he spins at 6.0 rev/s. By what factor does the skater's kinetic energy change when he draws his arms in?
a. 2.4
c. 0.58
b. 1.7
d. 0.12