Purchase Solution

Physics: Speed of car at bottom of driveway; initial speed of bullet

Not what you're looking for?

Ask Custom Question

20 A 2.10 x 10³ kg car starts from rest at the top of a 5.0 m long driveway that is sloped at 20° with the horizontal. If an average friction force of 4.0 x 10³ N impedes the motion, find the speed of the car at the bottom of the driveway.

21. An 8.00 g bullet is fired into a 2.5 kg block that is initially at rest at the edge of a 1.0 m high table. The bullet remains in the block, and after impact the block lands 2.00 m from the bottom of the table. Determine the initial speed of the bullet.

Purchase this Solution
Solution Summary

The expert examines a speed of car at bottom of driveway and the initial speed bullet.

Solution Preview

20.
Gravity force acting on the car to move it down to slope is:
Fg = m x g x sin 20
Fg = 2.1 x 10^3 x 9.81 x 0.342
Fg = 7045 N

Friction force acting on the car is resisting the movement so the net force:
Fnet = ...

Purchase this Solution
Free BrainMass Quizzes
Classical Mechanics

This quiz is designed to test and improve your knowledge on Classical Mechanics.

The Moon

Test your knowledge of moon phases and movement.

Basic Physics

This quiz will test your knowledge about basic Physics.

Variables in Science Experiments

How well do you understand variables? Test your knowledge of independent (manipulated), dependent (responding), and controlled variables with this 10 question quiz.

Introduction to Nanotechnology/Nanomaterials

This quiz is for any area of science. Test yourself to see what knowledge of nanotechnology you have. This content will also make you familiar with basic concepts of nanotechnology.

View More Free Quizzes
Related BrainMass Solutions

  • 7 Problems in Mechanics: Force and motion, work power energy

    What was the force exerted on the bullet in bringing it to rest? Question 2: A big car of mass 2m travels at speed v, and a small car of mass m travels with a speed 2v. Both skid to a stop with the same coefficient of friction.

  • physics problems related to momentum and impulse

    98388 Physics questions 28-A 7.0 g bullet is fired into a 1.5 kg ballistic pendulum. The bullet emerges from the block with a speed of 200 m/s, and the block rises to a maximum height of 12 cm. Find the initial speed of the bullet?

  • Impulse Momentum, Conservation of Linear Momentum, & Collisions

    At what speed was the utility vehicle traveling? Solution: Initial momentum of car = 1100 x 32 = 35200 kg.m/s Let speed of the sports vehicle = v.

  • Physics: Momentum and Speed

    a) Initial momentum of the bullet = 0.005 x 109.5 = 0.548 kg.m/s Initial momentum of the block = 0 As the bullet gets embedded in the block, the velocity of both will be the same after the collision. Let the common speed be v.

  • collision between a bullet and block

    Both of the answers are expressed in terms of the initial speed of the bullet. The solution explains on the collision between a bullet and a block, which is at rest at the edge of a frictionless table.

  • Impulse and force exerted by a bat

    Hence, Initial momentum of the bullet + Initial momentum of the can = Final momentum of the bullet + Final momentum of the can 0.002 x 900 + 0 = 0.002 x 720 + 0.11v where v = speed of the can after the bullet exits from it v = 3.27 m/s The can

  • 23 problems on kinamatics & Newton's laws of motion

    Zero Question 13 : See attachment Question 14: A Stone is thrown horizontally with an initial speed of 7.5 m/s from the edge of the cliff. A stopwatch measures the stone trajectory from the top of the cliff to the bottom to be 2.5 s.

  • Postulates of the Special Theory of Relativity

    When train is moving, add the speed of the train to the speed of the bullet. The speed will equal to the speed of bullet when train is at rest. Thus, the bullet will move faster when fired from the moving train. 3.

  • Linear momentum, bullet's energy, and billiard ball rebound

    A 5-g bullet with a speed of 200m/s is fired horizontally into a 0.75 kg wooden block at rest on a table.

View More Related Solutions