A high-speed photograph of a club hitting a golf ball is shown in the figure below. The club was in contact with a ball, initially at rest, for about 0.0016 s. If the ball has a mass of 55 g and leaves the head of the club with a speed of 2.9 x 102 ft/s, find the average force (in kN) exerted on the ball by the club. kN Ted Kinsman/Photo Researchers, Inc.
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- 7. During a snowball fight, a 0.30-kilogram snowball traveling at a speed of 17.0 m/s hits a student in the back of the head. If the contact time is 0.10 s, what is the magnitude of the average force on the student's head? N ssf f60° Ossi 09 JS 50 ssf60Consider the following question: A car moving at 10 m/s crashes into a tree and stops in 0.26 s. Calculate the force the seatbelt exerts on a passenger in the car to bring him to a halt. The mass of the passenger is 70 kg. Would the answer to this question be different if the car with the 70-kg passenger had collided with a car that has a mass equal to and is traveling in the opposite direction and at the same speed? Explain your answer.A car (VW) and a truck (C) collide inelastically (stick together). The impact is made in a very short time of Δt = 0.1 s. Initial speeds:UVW = 40.0 m / sUC = 30.0 m / sMasses:MVW = 900.0 kgMC = 2000.0 kg d) Determine the average vector accelerationAVW = AC = e) Vector average force on C and VW. (Do you notice something important in the results?).FVW = FC = f) For the case of truck C, determine its : ΔP = Solve all subsections
- A rocket is fired in a gravity-free environment in deep space. The rocket has an initial mass of 9500 kg and ejects gas with a velocity of 2450 m/s. The rocket fires for 4.40 s. Calculate the mass (in kg) of the gas that must be ejected in the time given to give the rocket an acceleration of 49.50 m/s2Most of us know intuitively that in a head-on collision between a large dump truck and a subcompact car, you are better off being in the truck than in the car. Why is this? Many people imagine that the collision force exerted on the car is much greater than that exerted on the truck. To substantiate this view, they point out that the car is crushed, whereas the truck is only dented. This idea of unequal forces, of course, is false; Newton's third law tells us that both objects are acted upon by forces of the same magnitude. The truck suffers less damage because it is made of stronger metal. But what about the two drivers? Do they experience the same forces? To answer this question, suppose that each vehicle is initially moving at 7.70 m/s and that they undergo a perfectly inelastic head-on collision. Each driver has mass 72.0 kg. Including the masses of the drivers, the total masses of the vehicles are 800 kg for the car and 4,000 kg for the truck. If the collision time is 0.110 s,…In a game of baseball, a 1.0-kg ball is pitched to Sarah at 20 m/s. She hits the ball back to the pitcher at the same speed. If her bat was in contact with the ball for 0.10 s, what is the magnitude of the average force the bat exerted? a) 40 N b) 400 N c) 200 N d) 800 N
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