Moment of Inertia: The L-shaped object shown in the figure consists of three small masses connected by thin uniform rods, each rod of mass 3.00 kg. Assume that the masses shown are accurate to three significant figures. What is the moment of inertia of this object (a) about the x-axis, and (b) about the y-axis?
What will be an ideal response?
(a) 19.4 kg ? m2 (b) 76.2 kg ? m2
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A 75.0 kg skier slides down a 75.0 m high slope without friction. The velocity of the skier at the bottom of the slope is
A. 20.6 m/s. B. 29.7 m/s. C. 38.3 m/s. D. 40.5 m/s. E. 50.0 m/s.
When a 24.0-W resistor is connected across a 12.0-V battery, a current of 410 mA flows. What is the internal resistance of the battery?
a. 29.3 W c. 5.3 W b. 0.9 W d. 0.02 W
On a planet where atmospheric gases are yellow, distant snow covered hills would look
A) bluish. B) greenish. C) yellowish. D) reddish. E) untinted.
Why is the nightside of Mercury so much colder (relatively speaking) than the dayside?
A. Mercury is in synchronous rotation, so the far side of Mercury never sees the Sun. B. Mercury's lack of an atmosphere keeps the planet from retaining its surface heat. C. Mercury's small size lets it cool quickly. D. Mercury's magnetic field acts like a blanket on the planet's dayside.