The diagrams below show forces of magnitude F applied to an equilateral triangular block of uniform thickness. In which diagram(s) is(are) the block in equilibrium?
A. A
B. B
C. C
D. D
E. A and B
Answer: B
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The vibrations of the Sun reveal information about:
A) the temperature of the core of the Sun. B) the structure of the atmosphere of the Sun. C) the interior structure of the Sun. D) the production of energy in the Sun. E) the magnetic field of the Sun.
A karate expert executes a swift blow and breaks a cement block with her bare hand. The magnitude of the force on her hand is
A) zero. B) less than the force applied to the cement block. C) the same as the force applied to the block. D) more than the force applied to the block. E) need more information
The Sun has a surface temperature of approximately 5800 K. At what wavelength does the maximum energy radiated by the Sun occur?
a. 5800 nm b. 300 nm c. 174 nm d. 500 nm e. 3000 nm
A conducting bar of length L rotates in a counterclockwise direction with a constant angular speed of +2.0 rad/s about a pivot P at one end, as shown. A uniform magnetic field (magnitude = 0.20 T) is directed into the paper. If L = 0.40 m, what is the potential difference, VA ? VB?
a.
+24 mV
b.
?24 mV
c.
+16 mV
d.
?16 mV
e.
+32 mV