A uniform rod is 3.0 m long. The rod is pivoted about a horizontal, frictionless pin through one end. The rod is released from rest at an angle of 27° above the horizontal. What is the angular speed of the rod as it passes through the horizontal position?
a. 3.0 rad/s
b. 2.8 rad/s
c. 2.1 rad/s
d. 2.5 rad/s
e. 3.4 rad/s
c
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Spherical Mirrors: A toy is 14 cm in front of a convex spherical mirror. If the image of the toy is 5.8 cm behind the mirror, what is the focal length of the mirror?
A. -4.1 cm B. +20 cm C. -9.9 cm D. -20 cm E. +9.9 cm
When is/was gravitational contraction an important energy generation mechanism for the Sun?
A) It was important when the Sun was forming from a shrinking interstellar cloud of gas. B) It is the primary energy generation mechanism in the Sun today. C) It has played a role throughout the Sun's history, but it was most important right after nuclear fusion began in the Sun's core. D) It is important during periods when the Sun is going from solar maximum to solar minimum.
The "acceleration of gravity" is 9.8 m/s2 everywhere on the surface of the Earth
Indicate whether the statement is true or false
A 50-kg load is suspended from a steel wire of diameter 1.0 mm and length 11.2 m. By what distance will the wire stretch? Young's modulus for steel is 2.0 × 1011 Pa
A) 1.5 cm B) 2.5 cm C) 3.5 cm D) 4.5 cm