The gravitational field on the surface of the earth is 
mass of the earth is 
kg, radius of the earth is
meters)
A. 3.40 N/kg.
B. 6.20 N/kg.
C. 9.80 N/kg.
D. 10.1 N/kg.
E. 20.3 N/kg.
C. 9.80 N/kg.
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The coils of a solenoid are stretched so that the length of the solenoid is twice its original length. Assuming the same current is passed though the solenoid before and after it is stretched, how does the magnetic field inside the solenoid change, if at all, as a result of the stretching?
a) The magnetic field after the stretching is one-fourth the value it was before stretching. b) The magnetic field after the stretching is one-half the value it was before stretching. c) The magnetic field after the stretching is the same as the value it was before stretching. d) The magnetic field after the stretching is twice the value it was before stretching e) The magnetic field after the stretching is four times the value it was before stretching.
A man is holding an 8.00-kg vacuum cleaner at arm's length, a distance of 0.550 m from his shoulder. What is the torque on the shoulder joint if the arm is held at 30.0° below the horizontal?
A) 21.6 Nm B) 2.20 Nm C) 4.40 Nm D) 12.6 Nm E) 37.4 Nm
Vision Problems: What is the power of the lens that has a focal length of 40 cm and a diameter if 5.0 cm?
A. -2.5 diopters B. +20 diopters C. +0.20 diopters D. +2.5 diopters E. +2.7 diopters
Two parallel rays (also parallel to the optic axis) reflect from a concave mirror. They intersect at
A) the center of curvature. B) the focal point. C) a point behind the mirror. D) infinity.