Learning Materials
Features
Discover
Chapter 4: Q7. (page 101)
What average force is required to stop a 950-kg car in 8.0 s if the car is traveling at 95 km/h?
The average force on the car is 3135 N.
Over 30 million students worldwide already upgrade their learning with 91影视!
All the tools & learning materials you need for study success - in one app.
Get started for free
A person pushes a 14.0-kg lawn mower at constant speed with a force ofdirected along the handle, which is at an angle of 45.0掳 to the horizontal (Fig. 4鈥�58). (a) Draw the free-body diagram showing all forces acting on the mower. Calculate (b) the horizontal friction force on the mower, then (c) the normal force exerted vertically upward on the mower by the ground. (d) What force must the person exert on the lawn mower to accelerate it from rest to 1.5 m/s in 2.5 seconds, assuming the same friction force?
FIGURE 4-58 Problem 50.
Draw the free-body diagram for a basketball player (a) just before leaving the ground on a jump, and (b) while in the air. See Fig. 4鈥�46.
A 14.0 kg bucket is lowered vertically by a rope in which there is 163 N tension at a given instant. What is the acceleration of the bucket? Is it upward or downward?
A 1280 kg car pulls a 350-kg trailer. The car exerts a horizontal force ofagainst the ground in order to accelerate. What force does the car exert on the trailer? Assume an effective friction coefficient of 0.15 for the trailer.
(a) What is the acceleration of two falling sky divers (total mass = 132 kg including parachute) when the upward force of air resistance is equal to one-fourth of their weight? (b) After opening the parachute, the divers descend leisurely to the ground at constant speed. What now is the force of air resistance on the sky divers and their parachute?
See Fig. 4鈥�44.
What do you think about this solution?
We value your feedback to improve our textbook solutions.
Explanations 
Textbooks 
Flashcards 
91影视 AI 
Notes 
Study Plans 
Study Sets 
Find a degree 
Magazine