While driving fast around a sharp right turn, you find yourself pressing against the car door. What is happening?
A. The door is exerting a rightward force on you.
B. Centrifugal force is pushing you into the door.
C. Both of the above.
D. Neither of the above.
Ans: A. The door is exerting a rightward force on you.
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For a few hundred thousand years after the Big Bang, atoms could not form. Electrons could not stay bound to protons or helium nuclei. However, eventually, atoms did combine when
A. there was enough angular momentum that protons and electrons acquired spins. B. the universe had expanded and cooled sufficiently. C. the theory of everything became active. D. the curvature of spacetime increased by 50%.
A series RLC circuit has an impedance of 120 ? and a resistance of 64 ?. What average power is delivered to this circuit when Vrms = 90 volts?
a. 36 W b. 100 W c. 192 W d. 360 W e. 12 W
Which of a planet's fundamental properties has the greatest effect on its level of volcanic and tectonic activity?
a. size b. distance from the Sun c. rotation rate
If a sunspot has a temperature of 4,500 K and the surrounding solar surface has a temperature of 5,800 K, how many times brighter is the surface compared to the sunspot?
a. 0.28 b. 0.36 c. 2.8 d. 3.6 e. 36