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A boxer stops a punch with his head. To approximate the force of the blow, treat the opponent's glove, hand, and forearm as aparticle of mass 1.68 kg moving with aninitial velocity of 21.5 m/s.a) Estimate the force exerted on the head if the hand moves forward 8.0 cm whiledelivering the blow and then coming to rest.b) Estimate the force exerted on the head if the head is deliberately moved back during the punch so that the hand moves forward 16 cm while decelerating.
You measured the speed of sound to be 384.9 m/s. Your lab partner measured it to be 342.2 m/s. What was the percent difference between these values
A small ferryboat is 4.00 m wide and 6.00 m long. When a loaded truck pulls onto it, the boat sinks an additional 4.60 cm into the river
An air conditioner connected to a 150 V rms ac line is equivalent to a 9.8 resistance and a 1.97 inductive reactance in series. What is the impedence of the air conditioner
The critical angle for total internal reflection at a liquid-air interface is 40.0. If a ray of light traveling in the liquid has an angle of incidence at the interface of 38.0, what angle does the refracted ray in the air make with the normal
A 1000 kg boat moves through the water with two forces actingon it. One is a 3000 N forward push by the water on the propellor,and the other is an 2400 N resistive force due to the water aroundthe bow.
You are driving to grocery store at 15 m/s .You is 140 m from an intersection when the traffic light turns red. Suppose that your reaction time is 0.70 s. and that your car brakes with constant acceleration. How far are you from the intersection whil..
An ideal heat-engine is to be used in an environment where the ambient temperature is 22.5 °C. What should be the minimum temperature of the hot heat reservoir
A skier of mass 70.0 kg is pulled up a slope by a motor-driven cable. A motor of what power is required to perform this task
According to safety standard for air bags, the maximum acceleration during a car crash should not exceed 60 g and should last for no more than 36 ms.
A 1590 kg car has just passed a diner. The closest the car came to the diner was R = 12.5 m, find the current magnitude of the angular momentum of the car about ther dinner
A box of 300N weight is at rest at the bottom of the plank that is 5.00m long and rises 30 degrees above ground. find the velocity of the box at the top of the plank
The driver of a car (total mass 1250kg) traveling 144km/h slams on the brakes and brings the car to a stop in 40.0m. Calculate the force required to stop the car
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