As per the turnoff point in the cluster H-R diagram, the oldest open clusters in the Milky Way have ages of about _____
A) 2 to 4 billion years
B) 5 to 7 billion years
C) 9 to 10 billion years
D) 12 to 13 billion years
C
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Three resistors,
and 
are connected in parallel to a 9.0 V battery. What is the power dissipated by the 
?
A. 2.0 W B. 3.0 W C. 9.0 W D. 27 W E. 81 W
Other than in the polar caps, any remaining water on Mars is likely stored as
A. permafrost beneath the surface of the planet. B. clouds high in the atmosphere of the planet. C. mists in the equatorial regions of the planet. D. frost on the surface of the planet.
A 120-kg mass rests on a horizontal surface. What is the magnitude of the normal force exerted by the surface on the mass?
What will be an ideal response?
The distance of the Earth from the Sun is 93 000 000 miles. If there are 3.15 × 10^7 s in one year, find the speed of the Earth in its orbit about the Sun
a. 9.28 miles/s b. 18.6 miles/s c. 27.9 miles/s d. 37.2 miles/s