The horizontal and vertical components of the initial velocity of a football are 16 m/s and 20 m/s respectively. If there is no air, how long does it take the football to reach the top of its trajectory?
A) 1.0 s
B) 2.0 s
C) 3.0 s
D) 4.0 s
E) 5.0 s
B
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A spaceship leaves Earth at 70.0% the speed of light. How fast must the spacecraft launch a shuttlecraft with respect to the ship so that it appears, from Earth, to be moving 98.7% the speed of light away
A) 0.928c B) 0.966c C) 0.987c D) 0.972c E) 0.911c
An astronaut is in a capsule in a stable orbit, about two Earth radii from the center of Earth. Her weight is
A) zero N. B) the same as on the surface of Earth. C) about one-half of her weight on the surface of Earth. D) about one-third of her weight on the surface of Earth. E) about one-quarter of her weight on the surface of Earth.
Consider a Carnot cycle starting at the state of highest pressure and smallest volume. Call the isothermal expansion from this state step 1, the adiabatic expansion which follows step 2, the isothermal compression that then follows step 3, and the adiabatic compression which returns the system to the initial state step 4 . In which steps does the internal energy of the system increase?
a. 1 and 2 b. 3 and 4 c. 1 and 3 d. 2 and 4
The apparent motion of an object when it is viewed from two different positions against a fixed background is called
a. Hubble's effect. b. parallax. c. paradox. d. Brighton's effect.