PROBLEM The driver of a1.00x10*3)kg car traveling on the interstate at 65.0 m/s (nearly 80.0 mph) slams on his brakes to avoid hitting a second vehicle in front of him, which had come to rest because of congestion ahead (Fig. 2.7) After the brakes are applied, a constant kinetic friction force of magnitude8.00x10*3 N acts on the car. Ignore air resistance. (a) At what minimum distance should the brakes be applied to avoid a collision with the other vehicle? (b) If the distance between the vehicles is initially only 30.0 m, at what speed would the collision occur?

PROBLEM The driver of a1.00x103)kg car traveling on the interstate at 65.0 m/s (nearly 80.0 mph) slams on his brakes to avoid hitting a second vehicle in front of him, which had come to rest because of congestion ahead (Fig. 2.7) After the brakes are applied, a constant kinetic friction force of magnitude8.00x103 N acts on the car. Ignore air resistance. (a) At what minimum distance should the brakes be applied to avoid a collision with the other vehicle? (b) If the distance between the vehicles is initially only 30.0 m, at what speed would the collision occur?

Name: 1 EXAMPLE 2.2 Collision Analysis oeupd onnoGOAL Apply the work-energy
Uploaded: 2024-03-20T06:57:57.000Z
Channel: Bartleby
Description: 1 EXAMPLE 2.2 Collision Analysis oeupd onnoGOAL Apply the work-energy theorem with a known force.PROBLEM The driver of a1.00x10*3)kg car traveling on the interstate at 65.0 m/s(nearly 80.0 mph) slams on his brakes to avoid hitting a second vehicle i

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter9: Energy In Nonisolated Systems

Section: Chapter Questions

Problem 6PQ

See similar textbooks

Similar questions

If only one external force acts on a particle, does it necessarily change the particles (a) kinetic energy? (b) Its velocity?
Give an example of something think of as work in everyday circumstances that is not work in the scientific sense. Is energy transferred or changed in form in your example? If so, explain how this without doing work.
The "shot" used in the shot-put event is a metal ball with a mass of 7.3 kg. When thrown in Olympic competition, it is accelerated to a speed of about 14 m/s. As an approximation, let's say that the athlete exerts a constant force on the shot while throwing it and that it moves a distance of 3 m while accelerating. (a) What is the shot's kinetic energy? (b) Compute the force that acts on the shot. (c) It takes about 0.5 s to accelerate the shot. Compute the power required. Convert your answer to horsepower.
Question 5: a. (i) Give an example of an object that has three forces acting on it, and (1) accelerates, (2) moves atconstant (nonzero) velocity, and (3) remains at rest. (ii) In terms of work done distinguish betweenconservative and non-conservative force.b. The drawing shows a sulfur dioxide molecule, SO2. It consists of two oxygen atoms and a sulfuratom. A sulfur atom is twice as massive as an oxygen atom. Using this information and the dataprovided in the drawing, find the center of mass of the sulfur dioxide molecule. Express youranswers in nanometers (1 nm = 10_9 m).
Part 1. A 3 kg package of tamales (see the figure below) slides along a floor with speed v1 = 5 m/s. It then runs into and compresses a spring, until the package momentarily stops. Its path to the initiallyrelaxed spring is frictionless, but as it compresses the spring, a kinetic frictional force from the floor, of magnitude 15 N, acts on the package. If k = 8 000 N/m, by what distance d is the spring compressed when the package stops? What makes up the system in this problem and state a reasonable assumption about this system? Consider the following for a rotational motion:r = 6 m, θ = 0.5t2, where t is in seconds and θ is in radians.Find the magnitudes of (a) tangential acceleration at t = 4 s, and (b) radial acceleration at t = 4 s.[1+1]
4) A force F pointing upward acts on an object while the object moves to the right. Does the force produce work on the object? Justify your answer.
2. A child and a sled with a combined mass of 50.0 kg slide down on a frictionless slope. If the sled starts from rest and has a speed of 3.0 m/s speed at the bottom, what is the height of the hill?
9. In the Incline Energy lab, partners Anna Litical and Noah Formula give a 1.00-kg cart an initial speed of 2.35 m/s from a height of 0.125 m above the lab table. Determine the speed of the cart when it is located 0.340 m above the lab table.
A freight train consists of two 9.00 ✕ 105 kg engines and 50 cars with average masses of 3.50 ✕ 105 kg. (a) What force (in N) must each engine exert backward on the track to accelerate the train at a rate of 4.00 ✕ 10−2 m/s2 if the force of friction is 7.50 ✕ 105 N, assuming the engines exert identical forces? This is not a large frictional force for such a massive system. Rolling friction for trains is small, and consequently, trains are very energy-efficient transportation systems. (Enter the magnitude.) b) What is the magnitude of the force (in N) in the coupling between the 37th and 38th cars (this is the force each exerts on the other), assuming all cars have the same mass and that friction is evenly distributed among all of the cars and engines? (Assume both engines are at the front of the train.)
1) A 1622 kg car has a speed of 11.3 m/s whenit hits a tree. The tree doesn’t move and thecar comes to rest.Find the change in kinetic energy of the car.Answer in units of J. 2)Find the amount of work done by the car asits front is pushed in.Answer in units of J. 3)Find the magnitude of the force that pushedthe front of the car in by 37 cm .Answer in units of N.
A small object of mass ?=0.0250kg is moving in the positive x-axis with velocity ??=12.0m/s. What constant force, directed to the negative x-axis, is needed to stop the object in a distance ?=15.0cm?Assume that is the only force acting on the object. You must use the Work-Kinetic Energy theorem to solve the problem, not Newton’s 2nd law.
2.) A child applies a push on his toy car causing it to move horizontally. He controls his applied push such that the x-component Fx varies with the toy’s displacement according to the graph below. What is the total work done by Fx as the toy car moves from x = 0 to x = 12m?