A rifle with a weight of 30 N fires a 5.0 g bullet with a speed of 300m/s. (a) Find the recoil speed of the rifle. (b) If a700 N man holds the rilfe firmly against his shoulder, find there coil speed of the man and his rifle.

Reggie
2020-11-01
Answered

You can still ask an expert for help

Nathanael Webber

Answered 2020-11-02
Author has **117** answers

initially both gun and bullet are at rest

Jeffrey Jordon

Answered 2021-10-12
Author has **2262** answers

The change in the momentum of an isolated system is zero where the initial momentum equals the final momentum. The particles interact in the system without interact with the environment. So, the momentum is conserved and we use the law of conservation of momentum as given by equation (6.7) in the form

The system includes the riﬂe and the bullet. We are given the weight of the rifle by w= 30 N. So, we can calculate its mass as next

Initially, the bullet and the rifle are at rest, so their initial velocities are zero. Hence, the initial momentum of the system is zero

Now, we plug the values for

=- 0.49 m/s

The velocity of the rifle is

asked 2020-10-21

An 80.0-kg skydiver jumps out of a balloon at an altitude of1000 m and opens the parachute at an altitude of 200 m. (a) Assuming that the total retarding force on the diver is constant at 50.0 N with the parachute closed and constant at 3600 N with the parachute open, what is the speed of the diver whenhe lands on the ground? (b) Do you think the skydiver will be injured? Explain. (c) At what height should the parachute be opened so that the final speed of the skydiver when he hits the ground is 5.00m/s? (d) How realistic is the assumption that the total retarding force is constant? Explain.

asked 2020-10-27

Problem: A 0.500kg block attached to a spring with the length 0.60m and force constant k=40.0 N/m is at rest with the back of the block at point A on a frictionless, horizontal airtable. The mass of the spring is negligible. You pull the block tothe right along the surface with a constant horizontal forceF=20.0-6N.

Questions:

A.) What is the blocks

asked 2020-11-20

The drawing shows a version of the loop-the-loop trick for a small car. If the car is given an initial speed of 4 m/s, what is the largest value that the radius r can have if the car is to remain in contact with the circular track at all times?

asked 2020-12-05

A diving borad 3.00 m long is supported at a point 1.00 m fromthe end, and a diver weighing 500 N stands at the free end. The diving board is of uniform cross section and weighs 280N.

A. Find the force at the support point.

B. Find the force at the end that is beng held down.

asked 2021-02-11

Solve the following system of linear equations in two variables by Substitution method.

asked 2021-05-29

Complex number in rectangular form What is (1+2j) + (1+3j)? Your answer should contain three significant figures.

asked 2021-05-18

Find the absolute max and min values at the indicated interval

$f(x)=2{x}^{3}-{x}^{2}-4x+10,[-1,0]$