As a spaceship's velocity gets closer to the speed of light with respect to an external observer, that observer will report that
A) its length will increase and its clock will run more slowly.
B) its length will decrease and its clock will run faster.
C) its length will decrease and its clock will run more slowly.
D) its length will increase and its clock will run faster.
E) None of these will happen.
C
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___________ in other galaxies should contain luminous O and B stars if they are like the Milky Way
a. The halos b. The bulges c. The spiral arms d. The globular clusters e. The coronas
Astronomers expect extrasolar planetary systems to have very different overall properties than those found in our solar system
Indicate whether the statement is true or false
A lighted candle is 10 m away from a wall. A concave mirror is being used to project an image of the candle onto the wall. If the image is going to be 3.0 times the size of the object, how far should the mirror be from the wall?
A) 6.5 m B) 7.0 m C) 6.0 m D) 5.5 m E) 15 m
Imagine hitting a heavy anvil with a hammer. The hammer is in contact with the metal for a short period of time. How do you suppose the time of contact depends upon how hard you hit the anvil (i.e
, does a hard hit remain in contact much longer or shorter than a light tap?) [It is reasonable to assume Hooke's law of elasticity to hold.]