What is the change in area (in cm2) of a 60.0 cm by 150 cm automobile windshield when the temperature changes from 0° C to 36.0° C. The coefficient of linear expansion of this glass is 9.0 × 10^-6/°C
a. 1.6
b. 2.9
c. 3.2
d. 4.9
e. 5.8
E
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As we learned in Chapter 5, the gravitational force between the earth and the sun supplies the centripetal force which causes the Earth to rotate about the sun. Does this force produce a torque about the sun?
A. Yes B. No
Two blocks of masses 20 kg and 8.0 kg are connected together by a light string and rest on a frictionless, level surface. Attached to the 8.0-kg mass is a second light string, which a person uses to pull both blocks horizontally. If the two-block system accelerates at 1.0 m/s2, what is the tension in the second string attached to the 8.0-kg mass?
a. 14 N c. 28 N b. 6.0 N d. 4.0 N
The spectrum of a star shows the 656 nm absorption line shifted to 654 nm. Which of the following can we conclude about this star?
A. The star is spinning rapidly. B. The star is approaching us with an approximate speed of 1,800 km/sec. C. The star is receding with an approximate speed of 1,800 km/sec. D. The star is approaching us with an approximate speed of 900 km/sec. E. The star is receding with an approximate speed of 900 km/sec.
A spaceship is moving away from an observer at relativistic speed. Its length at rest is 100 m, but the observer measures its length as 60 m. A time interval of 84 s on the spaceship would be measured by the observer to be which of the following?
a. 50.4 s b. 30.2 s c. 134 s d. 140 s e. 84 s