The diagrams below show forces applied to a wheel that weighs 20 N. The symbol W stands for the weight. In which diagram(s) is(are) the wheel in equilibrium?
a.
A
b.
B
c.
C
d.
D
e.
A and C
c
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A car with tires whose radius is 35 cm is traveling along a highway at 29.8 m/s. What is the angular speed of the tires?
A) 90 rad/s B) 85 rad/s C) 80 rad/s D) 75 rad/s E) 70 rad/s
To increase the force of gravity between two masses by a factor of 9, how would the objects have to be moved?
Two converging lenses, the first with focal length 25 cm and the second with focal length 20 cm, are separated by 30 cm. A 4.0 cm tall object is placed 50 cm in front of the first lens. Where is the final image?
A. 20 cm after the second lens B. 20 cm before the second lens C. 10 cm after the second lens D. 10 cm before the second lens E. 50 cm after the second lens
Astronomers know what the solar interior is like by
A. constructing a miniature Sun in the laboratory and extrapolating the results to the real Sun. B. using locally tested physics combined with observations to build a mathematical model of what the Sun should be like in its interior. C. observing the interior directly. By using the appropriate filters, it is possible to reduce the bright glow of the Sun and to peer directly at the Sun's interior. D. sending probes directly into the Sun and sending back the information.