Suppose you are aboard a rocket that is orbiting Earth in the low, circular orbit shown. If you want to escape from Earth and head to the Moon or Mars along the "escape" path shown, what do you need to do?
A) Fire the rocket engine in your direction of travel, so that you gain speed.
B) The only way to end up on the "escape" path is to first return to Earth, then launch your rocket with escape velocity.
C) Turn the rocket around, and fire the engine so that you lose speed.
D) Throw some excess supplies overboard, so that your rocket becomes less massive.
A) Fire the rocket engine in your direction of travel, so that you gain speed.
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The outer core is thought to be molten because it
A) is denser than the inner core. B) will not transmit P-waves. C) is made of iron and nickel. D) will not transmit S-waves.
What is the kinetic energy of an electron that passes undeviated through perpendicular electric and magnetic fields if E = 4.0 kV/m and B = 8.0 mT?
a. 0.65 eV b. 0.71 eV c. 0.84 eV d. 0.54 eV e. 1.4 eV
If you are driving 72 km/h along a straight road and you look to the side for 4.0 s, how far do you travel during this inattentive period?
A) 40 m B) 20 m C) 18 m D) 80 m
Two fireworks explode at the same position on the 4th of July. A stationary observer notices that the time interval between the two events was 5.00 seconds. A second observer flies past the fireworks at a speed of 0.600 c. What value does she obtain when she measures the time interval between the two explosions?
a. 8.33 s b. 6.25 s c. 4.00 s d. 3.00 s e. 5.00 s