A 2.4-kg ball falling vertically hits the floor with a speed of 2.5 m/s and rebounds with a speed of 1.5 m/s. What is the magnitude of the impulse exerted on the ball by the floor?
a. 9.6 N s
b. 2.4 N s
c. 6.4 N s
d. 1.6 N s
e. 1.0 N s
a
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What will be an ideal response?
Superconductors have been discussed as a means for electrical energy storage. Because they are resistanceless, a current once started in a loop would continue without loss. If a current of 1.0 × 10^4 A were started in a huge toroidal coil of radius 1.0 km and inductance 70 H, how much electrical energy (in kWh) could be stored?
a. 480 kWh c. 690 kWh b. 300 kWh d. 970 kWh
The orbit of the planet Jupiter is ellipse with the Sun at one focus. What is located at the other focus?
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