A wheel rotates about a fixed axis with an initial angular velocity of 20 rad/s. During a 5.0-s interval the angular velocity decreases to 10 rad/s. Assume that the angular acceleration is constant during the 5.0-s interval. How many radians does the wheel turn through during the 5.0-s interval?
a. 95 rad
b. 85 rad
c. 65 rad
d. 75 rad
e. 125 rad
D
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Studies of remanent magnetism in rocks spreading from the Mid-Atlantic Ridge reveal symmetric bands of magnetic anomalies. These anomalies provide
a. support for the idea of continental drift. b. evidence of Earth's magnetic pole reversals. c. both (A) and (B). d. neither (A) nor (B).
A 5.0-nC point charge is embedded at the center of a nonconducting sphere (radius = 2.0 cm) which has a charge of ?8.0 nC distributed uniformly throughout its volume. What is the magnitude of the electric field at a point that is 1.0 cm from the center of the sphere?
a. 1.8 × 10^5 N/C b. 9.0 × 10^4 N/C c. 3.6 × 10^5 N/C d. 2.7 × 10^5 N/C e. 7.2 × 10^5 N/C
A car starts from rest and accelerates uniformly at 3.0 m/s2 toward the north. A second car starts from rest 6.0 s later at the same point and accelerates uniformly at 5.0 m/s2 toward the north
How long after the second car starts does it overtake the first car? A) 12 s B) 19 s C) 21 s D) 24 s
Which two bodies show evidence of heavy cratering?
a. Mercury and Venus b. Mercury and Earth c. Mercury and Earth’s Moon d. Earth and Venus e. Earth and Mars