A long wire carries a current of 3.0 A along the axis of a long solenoid (radius = 3.0 cm, n = 900 turns/m, current = 30 mA). What is the magnitude of the magnetic field at a point 2.0 cm from the axis of the solenoid? Neglect any end effects
a. 34 ?T
b. 64 ?T
c. 30 ?T
d. 45 ?T
e. 4.0 ?T
d
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The gauge pressure inside a pressure cooker is 13 psi. What is the net force on the lid of the pressure cooker if the lid's area is 110 square inches?
Observer A sees a pendulum oscillating back and forth in a relativistic rocket and measures its period to be TA. Observer B moves along with the rocket and measures the period of the pendulum to be TB
What is true about these two time measurements? A) TA > TB B) TA = TB C) TA < TB D) TA could be greater or smaller than TB depending on the direction of the motion.
The tension in a string from which a 4.0-kg object is suspended in an elevator is equal to 44 N. What is the acceleration of the elevator?
a. 11 m/s2 upward b. 1.2 m/s2 upward c. 1.2 m/s2 downward d. 10 m/s2 upward e. 2.4 m/s2 downward
Two areas in which fusion is the source of energy are __________ and __________
Fill in the blank(s) with correct word