Mechanics | Relativity Answers

An object of mass 4 kg is moved on a horizontal surface with a constant acceleration of 0.2m/s^2 , by a horizontal force of 6 Newtons. Find the friction force acting on the object and the coefficient of friction.

Motion of a particle is determined by the equation

d x dx x t

dt dt

2

2

-

-

 4 8 20cos2

The particle starts from rest at x = 0. Find x(t).

An engine of a car of mass 1200kg produces a force of 5000N calculate the acceleration of the car if the is 2000N of air resistance acting against the car

A rocket of mass 2000kg produce a thrust of 3000N during take off calculate the acceleration of the rocket. Given g=10

how to use the parallelogram method to add more than two vectors. 

how to use the parallelogram method to add more than two vectors. 

An aircraft flying at an unknown initial velocity accelerates uniformly,at the rate of 5m/s².it reaches a velocity of 200m/s after accelerating over a distance of 3000 m. calculate the initial velocity of the aircraft

4. Experiments show that the actual number of muons that reach the base of Mt. Washington is 400.

a. According to your muon clock graph, how much time has elapsed if 400 muons reach the base of Mt. Washington?

b. By what factor do the times you found differ?

c. Suggest an explanation for this difference.

the position of a particle is given by the expression x = 4cos (3πt+πi), where x is in meters and t is in seconds. Calculate the frequency, the period of the motion and the amplitude of motions.

1. Suggest a way how to use the parallelogram method to add more than two vectors. 
2. Is it possible to add two vectors having different magnitudes and yield zero resultant? Support your answer. How about instead of only two vectors, we have three vectors to be added? Support your answer.
3. A given vector has at least one of its components not equal to zero. Is it possible for this vector to have zero resultant? Support your answer.