The position-time equation for a cheetah chasing an antelope is: xf = 1.6m + (1.7m/s2)t2
(a) What is the initial position of the cheetah?
(b) What is the initial velocity of the cheetah?
(c) What is the cheetah's acceleration?
(d) What is the position of the cheetah at t = 4.4s?

Abatter hits the baseball a with an initial velocity of v0 = 110 ft/sec directly toward fielder b at an angle of 23° to the horizontal; the initial position of the ball is 2.2 ft above ground level. fielder b requires 0.44 sec to judge where the ball should be caught and begins moving to that position with constant speed. because of great experience, fielder b chooses his running speed so that he arrives at the “catch position” simultaneously with the baseball. the catch position is the field location at which the ball altitude is 8.4 ft. determine the velocity of the ball relative to the fielder at the instant the catch is made.

The most important difference between a wedge and an inclined plane is a. their size b. their shape c. how they are used d. what they are made of

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.