How high a hill would a 75-kg hiker have to climb to increase her gravitational potential energy by 10,000 J?
What will be an ideal response?
14 m
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If Hubble's constant is taken to be 70 km/sec/Mpc, and a quasar is found with a radial velocity of 0.95 times the speed of light, how far away is the quasar?
a. 4100 Mpc b. 0.014 Mpc c. 67 Mpc d. 74 Mpc e. 300,000 Mpc
The amount of energy a photon carries depends on its wavelength
a. True b. False Indicate whether the statement is true or false
When does hydrogen first begin to fuse into helium in the star formation process?
A) when the cloud first begins to contract B) when the thermal pressure is trapped at the center of the cloud C) when the protostars undergoes convective contraction D) when the protostar undergoes radiative contraction E) only when the star reaches the main-sequence
A 2.0-?F capacitor and a 4.0-?F capacitor are connected in series across an 8.0-V potential source. What is the charge on the 2.0-?F capacitor?
A) 2.0 ?C B) 11 ?C C) 4.0 ?C D) 25 ?C E) 12 ?C