The gravitational field at a satellite that is orbiting about the earth at an altitude of 5,000 km is (G =
the mass of the earth is 
A. 9.55 N/kg.
B. 8.43 N/kg.
C. 3.08 N/kg.
D. 6.33 N/kg.
E. 5.28 N/kg.
C. 3.08 N/kg.
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Specific Heat: Object 1 has three times the specific heat capacity and four times the mass of Object 2. The two objects are given the same amount of heat. If the temperature of Object 1 changes by an amount ?T, the change in temperature of Object 2 will be
A. ?T.
B. 
?T.
C. 
?T.
D. 6?T.
E. 12?T.
Burl and Paul have a total weight of 1300 N. The tensions in the ropes that support the scaffold they stand on add to 1700 N. The weight of the scaffold itself must be
A) 400 N. B) 500 N. C) 600 N. D) 800 N.
A sewing machine needle moves up and down in simple harmonic motion with an amplitude of 1.27 cm and a frequency of 2.55 Hz. (a) What is the maximum speed of the needle? (b) What is the maximum acceleration of the needle?
What will be an ideal response?
A heat engine takes in 500 J of energy from the hot reservoir in one cycle while performing 100 J of work. The amount of heat transferred to the cold reservoir in the same time is
A. 400 J. B. zero. C. 500 J. D. 300 J. E. 200 J.