1. Homework Statement
A ball on a string moves in a vertical circle of radius R at a constant speed with a centripetal acceleration a. At its
lowest point, the ball is a negligible height above the ground. After several revolutions, the string breaks at the highest
point in the motion. In...
1. Homework Statement
Suppose a stone is thrown from a 45.0 m tall building at an angle 26.0° below the horizontal. If it strikes the ground 30.3 m away, find the following values. (a) time of flight
__________s
(b) initial speed
_________ m/s
(c) speed and angle of the velocity vector...
1. Homework Statement
At time t = 0, a hockey puck is sent sliding in the +x direction over a frozen lake, directly into a strong wind. Figure 2-13 gives the velocity v of the puck versus time, as the puck moves along a single axis. (The time axis is marked in increments of 0.25 s.) At t = 9.0...
1. Homework Statement
A speedboat moving at 31.0 m/s approaches a no-wake buoy marker 100 m ahead. The pilot slows the boat with a constant acceleration of -3.5 m/s2 by reducing the throttle.
(a) How long does it take the boat to reach the buoy?
______ s
(b) What is the velocity of the boat...
1. Homework Statement
Which of the following is true?
a. None of these answers are correct.
b. If a car is traveling eastward, its acceleration is eastward.
c. A particle with constant acceleration can never stop and stay stopped.
d. If a car is slowing down, its acceleration must be...
1. Homework Statement
A student at the top of a building of height h throws ball 1 upward with a speed of vi and then throws ball 2 downward with the same initial speed, vi. How does the final speed of ball 1, v1f, compare to the final speed of ball 2, v2f, when they reach the ground?
v1f =...
1. Homework Statement
A person takes a trip, driving with a constant speed of 90.5 km/h except for a 22.0 min rest stop. If the person's average speed is 73.4 km/h, how much time is spent on the trip and how far does the person travel?
2. Homework Equations
v = d/t
3. The Attempt...
1. Homework Statement
Two cars travel in the same direction along a straight highway, one at a constant speed of 55 mi/h and the other at 65 mi/h.
(a) Assuming that they start at the same point, how much sooner does the faster car arrive at a destination 10 mi away?
______ min...