To transmit four times as much energy per unit time along a string, you can
a. double the frequency.
b. double the amplitude. c. increase the tension by a factor of 16.
d. do any one of the above. e. do only (a) or (b) above.
D
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A star begins fusing hydrogen to helium the moment it leaves the main sequence
Indicate whether the statement is true or false
Basic Postulates: You are riding in a spaceship that has no windows, radios, or other means for you to observe or measure what is outside. You wish to determine if the ship is stopped or moving at constant velocity. How can you do this?
A. You can determine if the ship is moving by determining the apparent velocity of light in the spaceship. B. You can determine if the ship is moving by checking your precision time piece. If it's running slow, the ship is moving. C. You can determine if the ship is moving by lying down and measuring your height. If you are shorter than usual, the ship is moving. D. You should give up because you have taken on an impossible task!
The extended sheet of galaxies that spans 70 Mpc × 200 Mpc and includes about 24,000 galaxies is called the ________
Fill in the blank(s) with correct word
In vacuum, the components of an EM wave are 
and 
0. In what direction is this wave moving?
A. positive x-direction B. negative x-direction C. positive y-direction D. negative y-direction E. positive or negative z-direction