If you represented each star by a grain of sand, how much sand would it take to represent all the stars in the universe?
A) all the sand in a typical playground sandlot
B) all the sand on Miami Beach
C) all the sand on the beaches of California
D) all the sand on the beaches in the United States
E) more than all the sand on all the beaches on Earth
E
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At what point does the accretion process turn a clump of debris into a planetesimal?
What will be an ideal response?
A 1000-kg car is slowly picking up speed as it goes around a horizontal unbanked curve whose radius is 100 m. The coefficient of static friction between the tires and the road is 0.35. At what speed will the car begin to skid sideways?
A) 9.3 m/s B) 24 m/s C) 34 m/s D) 35 m/s E) 19 m/s
A mass of 3 kg is moving with a velocity of 0.25 m/s. An unbalanced force is applied and increases the velocity to 0.45 m/s. The work done by the unbalanced force is
a) 0.34 J b) 0.84 J c) 0.21 J d) 1.2 J
The cosmic background radiation
a. has a blackbody spectrum b. has its peak emission in the microwave band c. corresponds to a blackbody at a temperature of 2.726 kelvins d. all of the above