A pair of toy freight cars, one twice the mass of the other, fly apart when a compressed spring that joins them is released. Acceleration will be greater for the
A) heavier car.
B) lighter car.
C) same on each.
Answer: B
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A champion athlete can produce one horsepower (746 W) for a short period of time. If a 70-kg athlete were to bicycle to the summit of a 500-m high mountain while expending power at this rate, she would have used at least ____ J of energy.
A. 746 B. 3.43 × 105 C. 3.73 × 105 D. 7.46 × 105 E. 2.61 × 107
The ALH84001 meteorite, discovered in Antarctica, came from ________, and suggests it may once have had life
Fill in the blank(s) with correct word
A satellite that weighs 4900 N on the launchpad travels around the earth's equator in a circular orbit with a period of 1.667 h
The earth's mass is 5.97 × 1024 kg, its equatorial radius is 6.3 × 106 m, and G = 6.67 × 10-11 N ? m2/kg2. (a) Calculate the magnitude of the earth's gravitational force on the satellite. (b) Determine the altitude of the satellite above the Earth's SURFACE.
A wheel (radius = 0.20 m) is mounted on a frictionless, horizontal axis. A light cord wrapped around the wheel supports a 0.50-kg object, as shown in the figure. When released from rest the object falls with a downward acceleration of 5.0 m/s2. What is the rotational inertia of the wheel?
?
?
a.
0.023 kg?m2
b.
0.027 kg?m2
c.
0.016 kg?m2
d.
0.019 kg?m2
e.
0.032 kg?m2