A toy rocket is launched vertically from ground level (y = 0.00 m), at time t = 0.00 s. The rocket engine provides constant upward acceleration during the burn phase
At the instant of engine burnout, the rocket has risen to 72 m and acquired a velocity of 30 m/s. The rocket continues to rise in unpowered flight, reaches maximum height, and falls back to the ground with negligible air resistance. The speed of the rocket upon impact on the ground is closest to A) 48 m/s
B) 44 m/s
C) 39 m/s
D) 54 m/s
E) 59 m/s
A
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Suppose you drop a 10-pound weight and a 5-pound weight on the Moon, both from the same height at the same time. What will happen?
A) The 10-pound weight will hit the ground before the 5-pound weight. B) Both will hit the ground at the same time. C) Both weights will float freely, since everything is weightless on the Moon.
The maximum mass of a white dwarf is
A) about the mass of our Sun. B) about 1.4 times the mass of our Sun. C) limitless; there is no theoretical limit to the maximum mass of a white dwarf. D) about 3 times the mass of our Sun.
According to current evidence, Pluto is best explained as
A) a large member of the Kuiper belt. B) a terrestrial planet that is surprisingly far from the Sun. C) a very small jovian planet. D) an escaped moon of Jupiter or Saturn.
A wire that is 1.0 mm in diameter and 3.5 m long stretches 3.5 mm when an 8.0-kg tool is hung from it
(a) What is Young's modulus for the material from this wire is made? (b) What is the effective spring constant for the stretching wire? What will be an ideal response?