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43 Car safety The National Transportation Safety Board indicates that a person in a car crash has a reasonable chance of survival if his or her acceleration is less than
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- Review. A hockey puck struck by a hockey stick is given an initial speed i in the positive x direction. The coefficient of kinetic friction between the ice and the puck is k. (a) Obtain an expression for the acceleration of the puck as it slides across the ice. (b) Use the result of part (a) to obtain an expression for the distance d the puck slides. The answer should be in terms of the variables k and g only.arrow_forwardSuppose you are driving a car at a high speed. Why should you avoid slamming on your brakes when you want to stop in the shortest possible distance? (Newer cars have antilock brakes that avoid this problem.)arrow_forwardA magician pulls a tablecloth from under a 200-g mug located 30.0 cm from the edge of the cloth. The cloth exerts a friction force of 0.100 N on the mug and is pulled with a constant acceleration of 3.00 m/s2. How far does the mug move relative to the horizontal tabletop before the cloth is completely out from under it? Note that the cloth must move more than 30 cm relative to the tabletop during the process.arrow_forward
- A hockey puck struck by a hockey stick is given an initial speed v0 in the positive x-direction. The coefficient of kinetic friction between the ice and the puck is k. (a) Obtain an expression for the acceleration of the puck. (b) Use the result of part (a) to obtain an expression for the distance d the puck slides. The answer should be in terms of the variables v0, k, and g only.arrow_forwardWhat is the deceleration of the rocket sled if it comes to rest in 1.1 s from a speed of 1000 km/h? (Such deceleration caused one test subject to black out and have temporary blindness.)arrow_forward4. A puck was launched along the ice surface, which, after passing the path S = 400 m, stopped after t = 40 s. Determine the coefficient of friction μ washers on ice.arrow_forward
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- 2. A 60-kg woman holds a 9-kg package as she stands within an elevator which briefly acceleratesupward at a rate of g/4. Determine the force R which the elevator floor exerts on her feet and thelifting force L which she exerts on the package during the acceleration interval. If the elevatorsupport cables suddenly and completely fail, what values would R and L acquire? ( 3 decimal places in final answer pls)arrow_forwardThe head injury criterion (HIC) is used to assess the likelihood of head injuries arising from various types of collisions; an HIC greater than about 1000 s is likely to result in severe injuries or even death. The criterion can be written as HIC = (aavg/g)2.5Δt, where aavg is the average acceleration during the time Δt that the head is being accelerated, and g is the free-fall acceleration. Shown is a simplified graph of the net force on a crash dummy’s 4.5 kg head as it hits the airbag during a automobile collision. What is the HIC in this collision?arrow_forward2. When you apply a constant force to an object does the object move at a constant velocity or does its velocity increase? Explain why this occurs using your understanding of acceleration/force (gravity).arrow_forward
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