A car coasts down a road into a valley and then coasts back up the next hill some distance
Where has its change in velocity been greatest? At the point at which it stops while going uphill? At the bottom of the hill? As it rolls back through the bottom to the other side? Explain.
The car's velocity has changed all along its path. Coming downhill, the car
speeded up. Going uphill, the car slowed down. At the bottom of the hill, the velocity
changed direction.
Without more information about the steepness of the hills, it is impossible to judge where
the change was greatest. We know we need to know how steep to know how fast the car's
velocity was changing from our experience. A car on a flat surface will not begin to roll. A
gentle incline can start the car rolling slowly. A steep incline can make the car roll quickly.
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When a particle is a distance r from the origin, its potential energy function is given by the equation U(r) = kr, where k is a constant and r =
(a) What are the SI units of k? (b) Find a mathematical expression in terms of x, y, and z for the y component of the force on the particle. (c) If U = 3.00 J when the particle is 2.00 m from the origin, find the numerical value of the y component of the force on this particle when it is at the point (-1.00 m, 2.00 m, 3.00 m). What will be an ideal response?
The angular size of the Sun as observed from Earth is about 0.5 degree.
Answer the following statement true (T) or false (F)
In the case of constant acceleration, the average velocity equals the instantaneous velocity:
a. at the beginning of the time interval. b. at the end of the time interval. c. half-way through the time interval. d. three-fourths of the way through the time interval.
In an elastic collision between two bodies of equal mass, with body 2 initially at rest, body 1 moves off at angle ? relative to the direction of its initial velocity and body 2 at angle ?. The sine of the sum of ? and ?, sin(? + ?), is equal to
A. 0. B. 0.500. C. 0.707. D. 0.866. E. 1.00.