Einstein's cosmological constant is a leading candidate for the "dark energy."
Indicate whether the statement is true or false
TRUE
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Solenoid: An ideal solenoid 20 cm long is wound with 5000 turns of very thin wire. What strength magnetic field is produced at the center of the solenoid when a current of 10 A flows through it? (?0 = 4? × 10-7 T ? m/A)
A. 0.0063 T B. 0.20 T C. 3.2 T D. 4.8 T E. 0.31 T
Our Sun and the entire Solar System orbits the center of the Milky Way Galaxy. It is somewhat less than ___ from the center of the Milky Way.
a. 20,000 LY b. 30,000 LY c. 30,000 LY d. 40,000 LY e. None of the above.
The coefficient of kinetic friction between the surface and the larger block is 0.25, and the coefficient of kinetic friction between the surface and the smaller block is 0.40. If F = 22 N and M = 1.0 kg in the figure, what is the magnitude of the acceleration of either block?
?
?
A. 1.8 m/s2 B. 2.6 m/s2 C. 1.4 m/s2 D. 2.2 m/s2 E. 3.7 m/s2
What is the equivalent resistance between points A and B in the figure when R = 18 ??
A. 48 ? B. 64 ? C. 80 ? D. 96 ? E. 110 ?