Reactance: At what frequency will a 20.0-mH inductor have an inductive reactance of 100 ??
A. 225 Hz
B. 655 Hz
C. 796 Hz
D. 457 Hz
E. None of the other answers is correct.
Answer: C
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A 2000-kg ore car rolls 50.0 m down a frictionless 10.0° incline. If there is a horizontal spring at the end of the incline, what spring constant is required to stop the ore car in a distance of 2.00 m?
a. 340 kN/m c. 1700 kN/m b. 68.1 kN/m d. 85.1 kN/m
Tutankhamen's gold coffin weighs 250 pounds. What is the mass of the coffin in kilograms?
A) 110 kg B) 550 kg C) 130 kg D) 95 kg E) 11 kg
Which of the following has the highest frequency?
a) Ultraviolet b) Microwaves c) X-rays d) Radiowaves
Find the net work done by friction on a box that moves in a complete circle of radius on a uniform horizontal floor. The coefficient of kinetic friction between the floor and the box is 0.25, and the box weighs 65N
A) 190 J B) 0 J C) 1,800 J D) 370 J