Mechanics | Relativity Answers

A large disc has mass 2kg,radius 0.2m and initial angular velocity 50rad/s and a small disc of mass 4 kg,radius0.1m and initial angular velocity 200rad/s.find the common final angular velocity after the disc are pushed into contact:is the kinetic energy conserved during this process?

Two Forces one vertical upwards and one horizontal to the left acts on an object. The magnitude of the vertical force is 45N and the magnitude of the horizontal force is 65N. Calculate the magnitude and direction of the net force acting on this object

Two students are 20 years old and one of them decide to leave for space travel

on a rocket made by Tesla, which can travel at a constant speed of 90 percent of

the speed of light. According the time measurement of the traveling student, the

time spent in space was 10 years. Calculate the age of the non-travelling student

when the travelling student travel back to earth.

What is curve of prohectile motuon.

You are standing on a slope of 20∘ to the horizontal and are going to throw a ball at vi = 13 m/s up the incline 

If you throw the ball at θ = 45 ∘ with respect to the horizontal, at what distance up the incline from your feet does it land? Assume the ball leaves your hand directly overhead, h = 2.1 m above the slope.

Explain the importance of these concept (moment of inertia) in dealing with problems concerning rotating body

 Show that the velocity of impact at the ground of an object thrown

vertically upward is equal to the initial velocity of the upward throw.

A trains from rest at station A and it took 150 seconds to reach station B. The speed-time curve of the motion is given below. Find the a) distance of the railway track connecting the stations and b) the acceleration of the train within the time interval 20-80 seconds.

What is the final temperature of 8575 cal of heat when removed from 15.0 g steam at 100⁰C?

You are on planet Dither, whose inhabitants often change their minds on how to choose a reference axis. At time t= 0, while standing 3.0 m to the left of the origin of a reference axis for which the positive direction points to the left, you launch a toy car that moves with increasing speed to the right. The car's x

x coordinate (x component of the position) is given by x(t)=p+qt+rt

2

x(t)=p+qt+rt2, where p

p= +3.0m

m, q

qq= -2.0m/s

m/s, and r

rr= -2.0m/s

2

m/s2.

What is the equation of the car's x coordinate if the reference axis is flipped so that the positive direction points to the right?

Express your answer in terms of some or all of the variables p q t r