How is the energy stored in a current-carrying inductor related to its self-inductance, L?
a. directly proportional to L1/2
c. inversely proportional to L
b. directly proportional to L
d. directly proportional to L2
B
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Unseen objects in our galaxy have been found by the bending effect they have on more distant stars' light passing near them. These small objects that don't emit light are calculated to have masses of about 10× the mass of the Sun. Which is the best choice for these objects?
a. black hole b. neutron star c. white dwarf d. main-sequence stars
A 4.0 ?F and a 1.0 ?F capacitor are connected in parallel and both are charged with a 12. volt battery. They are disconnected from the battery and reconnected positive side of the 1st to negative side of 2nd, and neg. side of 1st to pos
side of 2nd. (a) How much was each charged when connected to the battery? (b) After reconnecting, how much charge is stored? (c) What potential exists across the final parallel combination?
Specific Heat: A 5.00-g lead BB moving at 44.0 m/s penetrates a wood block and comes to rest inside the block. If half of its kinetic energy is absorbed by the BB, what is the change in the temperature of the BB? The specific heat of lead is 128 J/kg ? K.
A. 0.940 K B. 1.10 K C. 1.26 K D. 2.78 K E. 3.78 K
A 10.0-g bouncy ball is confined in a 8.3-cm-long box (an infinite well). If we model the ball as a point particle, what is the minimum kinetic energy of the ball? (h = 6.626 × 10-34 J ? s)
A) 8.0 × 10-64 J B) 3.2 × 10-46 J C) 1.3 × 10-20 J D) zero