Classical Mechanics Answers

An object slides down at the top of a hill starting from rest it takes 8 seconds to slide down 100 meters at an angle of 60. Then what will be the coefficient of kinetic friction?

During a time interval of 90 minutes a car

(a) Runs at 50 km/hr for the first 20 min,

(b) Accelerates uniformly to 90 km/hr for the next 10 min,

(e) Runs at the speed of 90 km/hr in the next 40 min, and (d) Decelerates uniformly to a stop in the remaining 20 min.

Calculate the (a) acceleration (b) deceleration (e) average speed during entire period.

Tom who is traveling at a speed of 67 km/hr sees Jerry 178 m away on the road. What is the minimum constant acceleration must Tom have to avoid Jerry assuming he doesn't move.

A 10Mg truck rolling at a constant speed of 30 kph along a horizontal rail comes to an incline of slope sin 0.1. Calculate how far it will coil up the slope before coming to a halt, (a) ignoring all resistive forces, and (b) assuming the rolling vesistance is 5% of the normal reaction of the truck

5kg weight who mation is constrained by vertical guides is dropped from reit 0.5 m onto a vertically aligned spring whose stiffness is 10 Nm How fast is the weight travelling when the spring has been compressed by 50 mm

A cube of mass 10 kg is at rest on a horizontal surface when it is subjected to a horizontal force P that varies with time t as P = 20t. If the static and kinetic coefficients of friction are both 0.4, calculate the velocity of the cube after 5 s.

A force of P N acting on a body of 5 kg travelling with a velocity of 5 ms increases its velocity to 10 ms. If the force acts in the direction of motion for a period of 5 s, what is the value of P?

A 500 Mg fug is Towing a 1000 Mg barge at a steady speed of 3 ms when the towline, which is horizontal, is winched in at a rate of 0.5 ms. What is the tug's speed during this operation!

A railway truck of 100 kg mass travelling with a velocity of 7 ms collides with a second truck of 200 kg mass and the two couple automatically and move off together. Calculate the velocity of the coupled trucks, and the energy lost to the system, if the second truck has a speed of 5 ms (al in the same direction, (b) in the opposite direction and ic) is initially stationary

A car preceding down a 1 in 10 incline at 6.5kph when it's brake are abruptly applied. How far does it skid along the road before stopping If the wheels lock and the coefficient of friction between tyres and the road is 0.7?