Which terrestrial world has the most atmosphere?
A) Venus
B) Earth
C) Mars
D) Mercury.
Answer: A) Venus
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The Schwarzschild radius of a 1 black hole is approximately
a. 3 km. b. 1,500,000 km, the size of the Sun c. 150,000,000 km or 1 AU. d. 3 x 1013 km or 1 pc.
Free Fall: A ball is projected upward at time t = 0 s, from a point on a flat roof 10 m above the ground. The ball rises and then falls with insignificant air resistance, missing the roof, and strikes the ground. The initial velocity of the ball is 58.5 m/s. Consider all quantities as positive in the upward direction. At time t = 5.97 s, the vertical velocity of the ball is closest to
A. 0 m/s. B. +175 m/s. C. +12 m/s. D. -175 m/s. E. -12 m/s.
How many time constants must elapse if an initially charged capacitor is to discharge 55% of its stored energy through a resistor?
a. 0.60 b. 0.46 c. 0.52 d. 0.40 e. 1.1
A 1.6-kg block slides down a plane (inclined at 25° with the horizontal) at a constant speed of 2.0 m/s. At what rate is the frictional force changing the mechanical energy of the block?
a. +28 W b. +13 W c. ?13 W d. ?28 W e. +6.5 W