Which of the following statements does not use the term angular size or angular distance correctly?
A) The angular size of the Moon is about 1/2 degree.
B) The angular distance between those two houses in the distance is 30°.
C) The angular distance between those two bright stars in the sky is about 2 meters.
D) The angular size of the Sun is about the same as that of the Moon.
E) You can use your outstretched hand to estimate angular sizes and angular distances.
C) The angular distance between those two bright stars in the sky is about 2 meters.
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Thermal Expansion: The coefficient of linear expansion of steel is 12 × 10-6 K-1. What is the change in length of a 25-m steel bridge span when it undergoes a temperature change of 40 K from winter to summer?
A. 1.2 cm B. 1.4 cm C. 1.6 cm D. 1.8 cm E. 2.0 cm
If a planet has a radius 16.0% greater than that of the Earth but has the same mass as the Earth, what is the acceleration due to gravity at its surface?
a. 8.45 m/s2 b. 1.57 m/s2 c. 10.0 m/s2 d. 7.28 m/s2
A straight wire of length l is oriented east-west and is in a magnetic field B pointing north. The wire is moving downward at a constant speed v. Which end of the rod is positively charged?
a. neither b. the east end c. the west end d. both ends
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