A1,000 kg boulder rolls 75 m down a mountain doing 735,000 j of work. what force was acting on the boulder?
a. 9.8 n
b. 7,500 n
c. 9,800 n
d. 73,500 n

Describe the path of a ray that approaches a mirror parallel to the principal axis.

The x-coordinate of a particle in curvilinear motion is given by x = 3.1t3 - 4.9t where x is in feet and t is in seconds. the y-component of acceleration in feet per second squared is given by ay = 2.3t. if the particle has y-components y = 0 and vy = 5.0 ft/sec when t = 0, find the magnitudes of the velocity v and acceleration a when t = 1.8 sec. sketch the path for the first 1.8 seconds of motion, and show the velocity and acceleration vectors for t = 1.8 sec. answers: v = ft/sec a = ft/sec2

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island