A stuntman of mass 55 kg is to be launched horizontally out of a spring- loaded cannon. The spring that will launch the stuntman has a spring coefficient of 266 N/m and is compressed 5 m prior to launching the stuntman. If friction and air resistance can be ignored, what will be the approximate velocity of the stuntman once he has left the cannon? A. 4 m/s B. 7 m/s C. 11 m/s D. 15 m/s

The bouncing of a falling object from the ground can give us clues about the ground forces on the object during the bounce. A steel ball is dropped from a height h1= 1.6 m as shown in the figure below. It bounces off the ground with a velocity v2. You can split this problem into two different motions. 1) Dropping the ball from h1;  and 2) ball in contact with the ground;   Solve each as a separate problem by identifying the initial and final velocity for each part. Make sure you have the correct signs for the velocity. (a) Calculate the velocity v1 as the ball hits the ground.   On the diagram indicate the positive and negative directions. Identify the initial velocity and final velocity for this part. Show the useful description, the physics concepts, principles, or equations, all mathematical steps, and any cross-checks or making sense of the answer.   (b) Assume that the ball is in contact with the ground for t=0.1 s. If v2= 4.5 m/s, calculate average acceleration of the ball during…

Block X Block Y 10. Vx M Figure 1. Before the collision Block X Block Y VXY. M Figure 2. After the collision Block X slides along a horizontal surface with a speed Vx toward block Y that is initially at rest, as shown in Figure 1. After block X collides with block Y, the two blocks remain stuck together and travel at a velocity of VXY, as shown in Figure 2. Frictional forces are considered to be negligible. Which of the following claims is correct regarding the momentum of the system containing only block X and the system that contains block X and block Y? A The system containing block X is an open system, and the system of both blocks is an open system. The system containing block X is an open system, and the system of both blocks is a closed system. The system containing block X is a closed system, and the system of both blocks is an open system. D The system containing block X is a closed system, and the system of both blocks is a closed system.

A 10 kg block of ice is at rest on a frictionless horizontal surface. A 1597 N force is applied to the block for 10 ms. During this time interval, the change of the velocity of the block is: 1.06 m/s Q3.19 m/s 2.28 m/s O 1.60 m/s O 0.80 m/s Time left 0:21:26 Clear my choice

An antitank weapon fires a 3.00-kg projectile which acquires a speed of 50.0 m/s after traveling 90.0 cm down a launching tube. Assuming the projectile was accelerated uniformly, what was the average force that acted on it? a. 4.17×(10^3)N b. 3.62×(10^3)N C. 2.82×(10^3)N d. 2.00×(10^3)N

A 0.1 kg ball is launched from a vertical cannon, 0.7 m high and 0.05 m wide. The cannon exerts a 146 N force on the ball for a period of 0.03 s. What is the final height ofthe ball?

A cat kicks a 0.43 kg chees block that was initially at rest. the net force is 20. What is the cheeses speed at t= 20 ms

A0.28-kg rock is thrown vertically upward from the top of a cliff that is 31 m high. When it hits the ground at the base of the cliff, the rock has a speed of 30 m/s . You may want to review (Pages 234 -241) - Part A Assuming that air resistance can be ignored, find the initial speed of the rock. Express your answer using two significant figures. ? m/s Submit Requeet Answer Part B Find the greatest height of the rock as measured from the base of the cliff. Express your answer using two significant figures. Hmar = Submit Requeet Anewer

A water slide is connected so that a swimmer, starting from rest at the top of the slide, leaves the end of the slide travelling horizontally. one person hits the water 6m from the end of the slide in a time 0.4 seconds after leaving the slide. ignoring friction and air resistance, find the height H. b) how does the answer change if the swimmer leves the end at an angle of 10 degrees above the horizontal?

Two blocks with different mass are attached to either end of a light rope that passes over a light, frictionless pulley that is suspended from the ceiling. The masses are released from rest, and the more massive one starts to descend. After this block has descended a distance 1.40 m , its speed is 3.00 m/s. If the total mass of the two blocks is 18.0 kg, what is the mass of the more massive block? Take free fall acceleration to be 9.80 m/s2.