Let h = 25.5 m and vi = 11.8 m/s. Find the speed of the ball...
Let h = 25.5 m and vi = 11.8 m/s. Find the speed of the ball just before it hits the ground. vf = m/s Find the ball's mechanical energy at the release point. KEi + PEi = J Find the ball's mechanical energy just before it hits the ground. KEf + PEf = J Remarks Notice that the final speed does not depend on the initial release angle. Kinetic energy is not a vector. The initial kinetic energy of the ball depends on the ball's initial speed, not it's velocity.
Homework Answers
If a ball rolls off the edge of a table at velocity u, what happens to...
If a ball rolls off the edge of a table at velocity u, what happens to its angular velocity ? Say if I wanted to calculate the velocity of the ball as it strikes the ground using energy methods, would I use PEi + KEi = PEf + KEf and I plug in u for the initial kinetic (1/2mu^2), mgh for initial potential, then 1/2mv^2 + 1/2 I*w^2 for the final kinetic ? And then solve for v ? Or...
Suppose you throw the 0.12-kg ball at this minimum speed. Your friend misses the catch. What...
Suppose you throw the 0.12-kg ball at this minimum speed. Your friend misses the catch. What is the ball's kinetic energy just before it hits the ground (2 s.f.)?
Problem 2: I throw a ball, mass m-5.0kg, at an initial speed of 3.0m/s, at an...
Problem 2: I throw a ball, mass m-5.0kg, at an initial speed of 3.0m/s, at an initial height of 1.7m, but at an angle of 37' with respect to the horizontal. It lands on the ground, at a final height of zero. (a) What is the initial velocity? (This is a VECTOR. Define ti as the horizontal, and +j as the vertical.) (b) What is the time when the ball obtains its maximum height? (c) What is the maximum height...
Problem 2: I throw a ball, mass m-5.0kg, at an initial speed of 3.0m/s, at an...
Problem 2: I throw a ball, mass m-5.0kg, at an initial speed of 3.0m/s, at an initial height of 1.7m, but at ar angle of 37" with respect to the horizontal. It lands on the ground, at a final height of zero. (a) What is the initial velocity? (This is a VECTOR. Define ti as the horizontal, and +j as the vertical.) (b) What is the time when the ball obtains its maximum height? (c) What is the maximum height...
A ball is shot from the ground into the air. At a height of 9.80 m,...
A ball is shot from the ground into the air. At a height of 9.80 m, its velocity is v = (8.50i + 4.00j) m/s, with i horizontal and j upward. To what maximum height does the ball rise? What total horizontal distance does the ball travel? What is the magnitude of the ball's velocity just before it hits the ground? What is the angle (below the horizontal) of the ball's velocity just before it hits the ground?
A soccer ball is kicked from the ground with an initial speed of 19.5 m/s at...
A soccer ball is kicked from the ground with an initial speed of 19.5 m/s at an upward angle of 45°. A player 55 m away in the direction of the kick starts running to meet the ball at that instant. What must be his average speed if he is to meet the ball just before it hits the ground?
A ball of mass 0.165 kg moving with speed of 2.37 m/s hits a wall and...
A ball of mass 0.165 kg moving with speed of 2.37 m/s hits a wall and bounces back with the same speed in the opposite direction. What is the change in the ball's kinetic energy?
The driver of a 840.0 kg car decides to double the speed from 22.4 m/s to...
The driver of a 840.0 kg car decides to double the speed from 22.4 m/s to 44.8 m/s. What effect would this have on the amount of work required to stop the car, that is, on the kinetic energy of the car? KEi= ×105 J KEf= ×105 J (select)3,4,8 or 2 times as much work must be done to stop the car.
You throw a ball vertically from an apartment balcony to the ground 13.6 m below. Find...
You throw a ball vertically from an apartment balcony to the ground 13.6 m below. Find the ball's initial velocity if it hits the ground 1.08 s after you release it. magnitude? direction? ---Select--- upward downward
A ball is dropped from 1.524 m and hits the floor with impact speed. Use conservation...
A ball is dropped from 1.524 m and hits the floor with impact speed. Use conservation of energy to calculate the ball's speed when it hits the ground, the impact speed.
Suppose you throw the 0.12-kg ball at this minimum speed. Your friend misses the catch. What is the ball's kinetic energy just before it hits the ground (2 s.f.)?
Problem 2: I throw a ball, mass m-5.0kg, at an initial speed of 3.0m/s, at an initial height of 1.7m, but at an angle of 37' with respect to the horizontal. It lands on the ground, at a final height of zero. (a) What is the initial velocity? (This is a VECTOR. Define ti as the horizontal, and +j as the vertical.) (b) What is the time when the ball obtains its maximum height? (c) What is the maximum height...
Problem 2: I throw a ball, mass m-5.0kg, at an initial speed of 3.0m/s, at an initial height of 1.7m, but at ar angle of 37" with respect to the horizontal. It lands on the ground, at a final height of zero. (a) What is the initial velocity? (This is a VECTOR. Define ti as the horizontal, and +j as the vertical.) (b) What is the time when the ball obtains its maximum height? (c) What is the maximum height...
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