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BIO Human Biomechanics. The fastest pitched baseball was measured at 46 m/s. A typical baseball has a mass of 145 g. If the pitcher exerted his force (assumed to be horizontal and constant) over a distance of 1.0 m, (a) what force did he produce on the ball during this record-setting pitch? (b) Draw free-body diagrams of the ball during the pitch and just after it left the pitcher’s hand.
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University Physics with Modern Physics Plus Mastering Physics with eText -- Access Card Package (14th Edition)
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- (a) Find an equation to determine the magnitude of the net force required to stop a car of mass m, given that the initial speed of the car is v0 and the stopping distance is x . (b) Find the magnitude of the net force if the mass of the car is 1050 kg, the initial speed is 40.0 km/h, and the stopping distance is 25.0 m.arrow_forwardYou push an object, initially at rest, across a frictionless floor with a constant force for a time interval t, resulting in a final speed of v for the object. You then repeat the experiment, but with a force that is twice as large. What time interval is now required to reach the same final speed v? (a) 4 t (b) 2 t (c) t (d) t/2 (e) t/4arrow_forwardA block with mass m1 hangs from a rope that is extended over an ideal pulley and attached to a second block with mass m2 that sits on a ledge slanted at an angle of 20 (Fig. P5.49). Suppose the system of blocks is initially motionless and held still, and then it is released. If m1 = 7.00 kg and m2 = 2.00 kg, find the magnitude of the acceleration of the blocks, assuming there is no friction between the second block and the ledge. FIGURE P5.49 Problems 49 and 50.arrow_forward
- An object of mass m = 1.00 kg is observed to have an acceleration a with a magnitude of 10.0 m/s2 in a direction 60.0 east of north. Figure P4.29 shows a view of the object from above. The force F2 acting on the object has a magnitude of 5.00 N and is directed north. Determine the magnitude and direction of the one other horizontal force F1 acting on the object. Figure P4.29arrow_forwardFIGURE P5.49 Problems 49 and 50. Suppose the system of blocks in Problem 49 is initially held motionless and, when released, begins to accelerate. a. If m1 = 7.00 kg, m2 = 2.00 kg, and the magnitude of the acceleration of the blocks is 0.134 m /s2, find the magnitude of the kinetic frictional force between the second block and the ledge. b. What is the value of the coefficient of kinetic friction between the block and the ledge?arrow_forwardA 821-kg car starts from rest on a horizontal roadway and accelerates eastward for 5.00 s when it reaches a speed of 30.0 m/s. What is the average force exerted on the car during this time?arrow_forward
- Superman must stop a 105-km/h train in 100 m to keep it from hitting a stalled car on the tracks. The train's mass is 3.6 × 105 kg. A.) Determine the force that must be exerted on the train. Express your answer to two significant figures and include the appropriate units. Enter positive value if the direction of the force is in the direction of the initial velocity and negative value if the direction of the force is in the direction opposite to the initial velocity. FTS =_____________________ ______________________ B.) Compare the magnitudes of the force exerted on the train and the weight of the train (give as %%). Express your answer using two significant figures. FTS/mg = _______________________% C.) How much force does the train exert on Superman? Express your answer to two significant figures and include the appropriate units. Enter positive value if the direction of the force is in the direction of the initial velocity and negative value if the direction of the force is…arrow_forwardA lunar lander in powered descent at 100 m above the surface of the moon slows down from a velocity of 20 m per s to 0.5 m per s at constant acceleration. Assume that the lander has a mass of 20,000 kg and that burning the fuel does not change the mass. Answer the following questions. a) What is the acceleration of the lander? b) How long will it take the lander to change velocity from 20 m per s to 0.5 m per s? c) What is the thrust (T) of the engines?arrow_forward10 of 31 Listen Study the scenario. A car is moving along a frictionless surface with a speed of 2 m/s to the left. You and your friend each come over and push the car at the same time. You exert a force of 6 N to the left, while your friend exerts a force of 6 N to the right. According to Newton's first law, how will this action affect the car's motion? The car will speed up because your force is in the same direction of the car's motion, making it speed up. The car will stop immediately because two balanced forces will cause an object to stop moving. The car will continue moving to the left but at a slower speed because your friend's force is going to make the car slow down. The car will continue to move 2 m/s to the left because there are balanced forces acting on it.arrow_forward
- A 63.0 kgkg parachutist falling vertically at a speed of 6.50 m/sm/s hits the ground, which brings him to a complete stop in a distance of 0.87 mm (roughly half of his height). 1) Assuming constant acceleration after his feet first touch the ground, what is the average force exerted on the parachutist by the ground? Express your answer with the appropriate units.arrow_forwardA cart of mass m can move without friction on an airtrack. Initially, it is at rest. Then, for a limited time At, it is pushed down the track with a constant force F. Which of the following statements are true? True: The higher the mass of the cart, the harder you have to push to achieve the same final speed in the same amount of time. False: When you stop pushing, the cart starts slowing down again. True: While the cart is pushed, it has a constant acceleration. Computer's answer now shown above. You are correct. Previous Tries Your receipt no. is 151-8623 final speed. Leaving all other quantities unchanged, what happens in the scenarios below? If you double the force, you reach four times the • If you push twice as long, you cover the same • If you use a cart with half the mass, you reach If you push twice as long, you reach the same Submit Answer Incorrect. Tries 2/6 Previous Tries distance during pushing. final speed. double the final speed.arrow_forwardA “sun yacht” is a spacecraft with a large sail that is pushed by sunlight. Although such a push is tiny, it can be used to send the spacecraft outward from the Sun in a cost-free but slow propulsion. Suppose that the spacecraft has a mass of 900 kg and receives a push of 20 N,a) What is the magnitude of the resulting acceleration?b) How far will it travel in 1 day? c) How fast will it then be moving?arrow_forward
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