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Information about forces from Collisions Suppose we drop a basketball (m = 0.63 kg) from a height of 1.0 m above the floor. It falls and rebounds off the floor to a height of 0.90 m. We estimate that the ball is in contact with the floor for 0.10 s based on the length of the sound produced by the bounce. (a) What is the change in momentum of the ball during the bounce? (b) What average force is exerted on the ball by the floor?
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Polymer Physics
Momentum is a Vector Find the horizontal and the vertical components of the momentum of a rocket at the point following its takeoff, where the mass of the rocket (including fuel) is 1.90 × 106 kg and its velocity is 4.20 × 102 km/h at an angle of 11.0° from the vertical.
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Polymer Physics
Change of Momentum A marble with a mass of 10.0 g is sliding at a constant speed of v= 2.00 m/s along a circular, horizontal, frictionless track, as shown in Figure 7-3(a). Find the change in the marble’s momentum as it goes from point A to point B. Express the change in vector form, and find the magnitude of the momentum change. Illustrate your solution with a diagram.
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Polymer Physics
Mass, Velocity, and Momentum Compare the magnitude of the momentum of a volleyball that leaves the server’s hands at 80.0 km/h with the momentum of a compact car travelling at 50.0 km/h. The mass of the volleyball is about 0.270 kg and the compact car has a mass of 7.40 × 102 kg.
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Polymer Physics
Finding the impulse A hockey puck is deflected by 32.0° from its original direction of motion so its speed does not change. (a) Create a sketch that shows the incident and scattered momenta as well as the change in momentum of the puck. (b) Use your sketch to calculate the magnitude of the impulse experienced by the hockey puck in terms of the magnitude of the incident momentum.
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Polymer Physics
Linear Model of impact force A golf ball with a mass of 46.0 g strikes a wall horizontally at a speed of 130. km/h and bounces straight back from the wall with the same speed. The collision takes 0.900 ms. (a) Find the impulse delivered to the ball by the wall. (b) Find the average force experienced by the ball during the collision. (c) Assuming that the force changes linearly with time, plot a force versus time graph. (d) Estimate the maximum value of the force of impact.
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Polymer Physics
Collision duration A very popular high school physics competition is the egg drop. Participants are challenged to build a structure to protect an egg from breaking when it is dropped. (a) Calculate the impulse required to stop a 50.0 g egg that has been dropped from a height of 3.00 m. (b) If the maximum force that can be exerted on an egg before it breaks is 100. N, determine the minimum collision time that the egg can withstand.
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Polymer Physics
Centre of Mass of two Particles Find the centre of mass of the system of two particles of masses m1 = 5m and m2 = m located a distance L apart, as shown in Figure 7-11(a).
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Polymer Physics
