Car A rear ends Car B, which has twice the mass of A, on an icy road at a speed low enough so that the collision is essentially elastic. Car B is stopped at a light when it is struck. Car A has mass m and speed v before the collision. After the collision
a. each car has half the momentum.
b. car A stops and car B has momentum mv.
c. car A stops and car B has momentum 2mv.
d. the momentum of car B is four times as great in magnitude as that of car A.
e. each car has half of the kinetic energy.
d
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A coil is wrapped with 300 turns of wire on the perimeter of a square frame (side length = 20 cm). Each turn has the same area as the frame, and the total resistance of the coil is 1.5 ?. A uniform magnetic field perpendicular to the plane of the coil changes in magnitude at a constant rate from 0.50 T to 0.90 T in 2.0 s. What is the magnitude of the induced emf in the coil while the field is changing?
A. 2.4 V B. 1.6 V C. 3.2 V D. 4.0 V E. 8.4 V
In a supermarket, you place a 5 lb (22.3 N) bag of oranges on a scale. The scale starts to oscillate at 2.70 Hz. What is the force constant of the scale?
A) 654 N/m B) 602 N/m C) 327 N/m D) 819 N/m E) 409 N/m
Describe the orbits of the Trojan asteroids
What will be an ideal response?
Components: The magnitude of a vector an only zero if all of its components are zero.
A. True B. False