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Driving down the road, you hit the brakes suddenly. As a result,
your body moves toward the front of the car. Explain, using
Newton’s laws.
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- In the movie The Rocketeer, a teenager discovers a jet-powered backpack in an old barn. The backpack allows him to fly at incredible speeds. In one scene, however, he uses the backpack to rapidly accelerate an old pickup truck that is being chased by “bad guys.” He does this by bracing his arms against the cab of the pickup and firing the backpack, giving the truck the acceleration of a drag racer. Is the physics of this scene “Good,”“Bad,” or “Ugly?” Draw and Explain.A force of 500 N acts for a time interval of 0.001 s on an object of mass 2 kg that was initially at rest. Calculate the speed of the object after the force acts.Required to answer. Single choice.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.
- A “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?Can you give a practical example of how a body can still accelerate even without changing its speed? If you can, give me an example and an explanation of itA car traveling at 20 m/s runs into a bridge abutment and crumples for 1.2 m before coming to a full stop. If we estimate the process as constant deceleration motion, what is the average force exerted on the car, which weighs 1500 kg, during the collision process?
- A 2110 kg car traveling at 8.4 m/s collides with a 2730kg car that is initially at rest at the stoplight. The cars stick together and move 3.30 m before friction causes them to stop. Determine the coefficient of kinetic friction between the cars and the road, assuming that the negative acceleration is constant and that all wheels on both cars lock at the time of impact.A hammer of mass m = 0.465 kg is moving horizontally at a velocity of v = 4.5 m/s when it strikes a nail and comes to rest after driving the nail a distance Δx = 0.95 cm into a board Part A) what is the duration of the impact, in seconds, assuming the acceleration of the hammer is constant? Part B) what is the average force, in newtons, exerted on the nail?Superman must stop a 130-km/hkm/h train in 110 mm to keep it from hitting a stalled car on the tracks. The train's mass is 3.6 ×× 105 kgkg. Determine the force that must be exerted on the train. Compare the magnitudes of the force exerted on the train and the weight of the train (give as %%). How much force does the train exert on Superman?
- . In the movie The Rocketeer, a teenager discovers a jet-powered backpack in an old barn. The backpack allows him to fly at incrediblespeeds. In one scene, however, he uses the backpack to rapidly accelerate an old pickup truck that is being chased by “bad guys.” Hedoes this by bracing his arms against the cab of the pickup and firing the backpack, giving the truck the acceleration of a drag racer. Isthe physics of this scene “Good,” “Bad,” or “Ugly”? Explain.A man is texting on his phone as he drives his car at 40 kmph, he suddenly notices a child is crossing the road so he rams his brake bringing the car to stop in 2s. If the car’s mass is 4000 kg and he weighs 60 kg, what was the retarding force on the car?A cyclist is coasting at 18 m/s when she starts on a 450 m long slope that is 40 m high. The cyclist and her bicycle have a combined mass of 75 kg. A steady 15 N drag force due to air resistance acts on her as she coast all the way down to the bottom. a) Draw a useful picture depicting this situation. Clearly label all lengths and relevant vector quantities (velocity, force). b) How much enercy does the cyclist have at the top of the slope? c) How much work does the drag on the cyclist as she goes down the slope? Clearly indicate sign of work. d) What is the cyclist's speed at the bottom of the slope?