The "surface" of a black hole is known as the _______________
a. core
b. corona
c. photosphere
d. event horizon
d
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In an RLC series circuit, which of the following statements is true?
A. The current is in phase with the voltage across the inductor. B. The current is in phase with the voltage across the resistor. C. The current is in phase with the voltage across the capacitor. D. None of the choices are true.
What happens to the rate of most chemical reactions as the temperature decreases?
A) the rate of reaction drops rapidly B) the rate of reaction drops only slightly C) the rate of reaction increases rapidly D) the rate of reaction stays the same
A very thin uniform rod, 2.40 m long and of weight 135 N, has a frictionless hinge at its lower end
It starts out vertically from rest and falls, pivoting about the hinge. Just as it has rotated through an angle of 55.0°, what is the downward acceleration of the end farthest from the hinge? A) 5.02 m/s2 B) 8.03 m/s2 C) 9.80 m/s2 D) 12.0 m/s2 E) 19.6 m/s2
Planet Zero has a mass of 5.0 × 10^23 kg and a radius of 2.0 × 10^6 m. A space probe is launched vertically from the surface of Zero with an initial speed of 4.0 km/s. What is the speed of the probe when it is 3.0 × 10^6 m from Zero's center?
a. 3.0 km/s b. 2.2 km/s c. 1.6 km/s d. 3.7 km/s e. 5.9 km/s