Slanting Surfaces Without Friction: A 200-N sled of slides down a frictionless hillside that rises at 37° above the horizontal. What is the magnitude of the force that the hill exerts on the sled parallel to the surface of the hill?
A. 200 N
B. 120 N
C. 160 N
D. 150 N
E. 0 N
Answer: E
You might also like to view...
An open circuit consists of a 12-?F parallel plate capacitor charged to 200 V and a 10-? resistor. At the instant when a switch closes the circuit (with no battery in it) the displacement current between the plates of the capacitor is
a. 1.2 ?A. b. 2.4 × 10^?4 A. c. 2.4 mA. d. 10 A. e. 20 A.
Answer the following statement(s) true (T) or false (F)
1. The frequencies of the normal modes of a string that is free at both ends are the same as those of a string that is fixed at both ends
Three pith balls supported by insulating threads hang from a support. We know that ball X is positively charged. When ball X is brought near balls Y and Z without touching them, it attracts Y and repels Z. Since pith is an insulating material, we can conclude that
A. Y has a negative charge. B. Z has a negative charge. C. Y has a positive charge. D. Z has a positive charge. E. Z is neutral (has no net charge).
Two uniform rods, each of length 2.0 m, are bent to form semicircles. One rod has a charger per unit lent of 1.5 nC/m, and the other has a charge per unit length of –1.5 nC/m. The semicircles are joined to make a circle. What is the magnitude of the electric field at the center of the circle?
a. 42 N/C b. 84 N/C c. 34 N/C d. 68 N/C e. 0