When a car decelerates, its front end goes down. Explain
What will be an ideal response?
The frictional force between the road and the tires required to decelerate the car acts below the center of mass of the car. For a car traveling to the left, this translates into a counterclockwise torque. The normal forces on the front and back tires are redistributed to produce a clockwise torque. This requires an increase in the normal force at the front and a decrease in the normal force at the back. As a result, the car dips down at the front.
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In an elastic collision, one ball has initial velocity v and strikes another, much less massive ball, that is initially at rest in a head-on collision. The velocity of the second ball after the collision is equal to:
A. v B. 2v C. v/2 D. -v E. something else
What do we mean by inflation, and why might it have occurred at the end of the GUT era?
What will be an ideal response?
A block of mass 4.0 kg rests on a horizontal surface where the coefficient of kinetic friction between the two is 0.20 . A string attached to the block is pulled horizontally, resulting in a 3.0-m/s2 acceleration by the block. Find the tension in the string. (g = 9.80 m/s2)
a. 12 N b. 7.8 N c. 20 N d. 4.2 N
A certain nucleus containing 8 protons and 7 neutrons has a radius R. Which of the following values would be closest to the expected value of the radius of a nucleus having 51 protons and 69 neutrons?
A) 1.85R B) 2.00R C) 2.14R D) 6.38R E) 8.00R