🏷️ LIMITED TIME OFFER: GET 20% OFF GRADE+ YEARLY SUBSCRIPTION →
Log in
Physics
12
answers
1
watching
492
views

What is his net force? How do I show his net force?

1) Greg is Diving off the 20m board. As he falls, gravity pulls him with a weight of 800 N. 100 N of friction is pushing against his motion. What is his net force?

 

Watch
12
answers
1
watching
492
views

For unlimited access to Homework Help, a Homework+ subscription is required.

Unlock all answers

Get 1 free homework help answer.
Already have an account? Log in
Share
Avatar image
Read by 1 person
Already have an account? Log in
Share
Avatar image
Read by 1 person
Already have an account? Log in
Share
Avatar image
Read by 1 person
Already have an account? Log in
Share
Avatar image
Read by 1 person
Already have an account? Log in
Share
Avatar image
Read by 1 person
Already have an account? Log in
Share
Avatar image
Read by 1 person
Already have an account? Log in
Share
Avatar image
Read by 1 person
Already have an account? Log in
Share
Avatar image
Read by 1 person
Already have an account? Log in
Share
Avatar image
Read by 1 person
Already have an account? Log in
Share
Avatar image
Read by 1 person
Already have an account? Log in
Share
Avatar image
Read by 1 person
Already have an account? Log in
Share

Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

A 75.7kg man steps off a platform 3.09m above the ground. He keepshis legs straight as he falls, but at the moment his feet touch theground his knees begin to bend, and, treated as a particle, hemoves an additional 0.650m before coming to rest.

-What is his speed at the instant his feet touch the ground?

-Treating him as a particle, what is the magnitude of hisacceleration as he slows down if the acceleration isconstant?

-Treating him as a particle, what is the direction of hisacceleration as he slows down if the acceleration isconstant?

-Draw a free-body diagram of this man as he is slowing down.

-Use Newton's laws and the results of part B to calculate the forcethe ground exerts on him while he is slowing down. Express thisforce in newtons.

-Use Newton's laws and the results of part to calculate the forcethe ground exerts on him while he is slowing down. Express thisforce as a multiple of the man's weight.

-What is the magnitude of the reaction force to the force you foundin part E?

-What is the direction of the reaction force to the force you foundin part E?

A brave but inadequate rugby player is being pushed backward by an opposing player who is exerting a force on 800 N on him. The mass of the losing player plus equipment is 90.0 kg, and he is accelerating at 1.20 m/s2 backward. 

(a) What is the force of friction between the losing player's feet and the grass? 

(b) What force does the winning player exert on the ground to move forward is his mass plus equipment is 110 kg?

(c) draw a sketch of the situation showing the system of interest used to solve each part. 

For this situation, draw a free-body diagram and write the net force equation. 

The Great Sandini is a 60.0 kg circus performer who is shot from a cannon (actually a spring gun). You don't find many men of his caliber, so you help him design a new gun. This new gun has a very large spring with a very small mass and a force constant of 1100 N/m that he will compress with a force of 4400 N. The inside of the gun barrel is coated with Teflon, so the average friction force will be only 40.0 N during the 4.00 m he moves in the barrel.

(a) At what speed will he emerge from the end of the barrel, 2.50 m above his initial rest position?

(b) Below is a list of variables representing some of the relevant quantities in this problem. Which ones are known quantities? Choose all that apply.

1.  final height

2.  mass of the body in motion

3.  final speed

4.  initial speed

5.  distance traveled between initial and final state

6.  force constant of spring

7.  initial height

8.  magnitude of compressing force

9.  magnitude of friction

 

Weekly leaderboard

Home
Homework Help 3,900,000
Physics 110,000
Start filling in the gaps now
Log in