A figure skater rotating at 5.00 rad/s with arms extended has a moment of inertia of 2.25 kg ? m2
If he pulls in his arms so his moment of inertia decreases to 1.80 kg ? m2, what will be his new angular speed?
A) 2.25 rad/s
B) 4.60 rad/s
C) 6.25 rad/s
D) 0.81 rad/s
C
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Addition by Components: The figure shows two vectors 
and 
, along with their magnitudes and directions. The vector 
is given by 
= 
- 
-5.0px;" />.
(a) What is the magnitude of vector 
?(b) What angle does vector 
make with the +x-axis?
Fill in the blank(s) with the appropriate word(s).
According to Einstein's equivalence principle, which of the following cannot be distinguished from a system accelerating with uniform acceleration in the presence of no gravity by any measurement within the system?
A) a system moving with constant velocity in the presence of no gravitational force B) a system that only contains massless objects C) a system that is not accelerating, but is subject to a uniform gravitational acceleration D) a system that is moving at the speed of light E) a system in free fall
The point in Earth's orbit where Earth is farthest from the Sun is known as perihelion. precession. the winter solstice. aphelion. a and d.
a. aphelion.
b. perihelion.
c. precession.
d. the winter solstice
e. a and d
Because of its high mean density and magnetic field, Mercury's large core must be made chiefly of ________
Fill in the blank(s) with correct word