Mechanics | Relativity Answers

A body of weight 64 N is pushed with just enough force to start it moving across a horizontal floor and the same force continue to act afterwards. If the coefficients of static and dynamic friction are 0.6 and 0.4 respectively, calculate the acceleration of the body.

A hollow cylinder of radius 10 cm rotates about its axis which is vertical. A small body remains in contact with the inner wall if the frequency of rotation is 200 per minute but falls at lower frequencies. Find the co-efficient of friction between the body and the cylinder.

A bullet, when fire at a fixed target, has its speed decreased to 50% after penetrating 15cm in to it. What additional thickness it will penetrate before coming to rest?

If an airplane is flying directly north at 300.0 km/h, and a crosswind is hitting the airplane at 50.0 km/h from the east, what is the airplane's resultant velocity?

An isolated charged conducting sphere of radius 12.0 cm
creates an electric field of 4.90 * 104
N/C at a distance
3.
21.0 cm from its center. (a) What is its surface charge density? (b) What is its capacitance?

a solid steel ball of volume 1 cm3 is recast into a hollow sphere so as to float on water. What should be the minimum volume of this hollow sphere when density of steel is 7.71 g/cm3 and that of water is 1g/cm3 ?

A car initially traveling eastward turns north by traveling in a circular path at uniform speed as in the figure. The length of the arc ABC is 240 m, and the car completes the turn in 39.0 s.find the magnitude.

Does the sun do any work on earth, when earth revolves around the sun in a perfectly circular orbit? Justify the answer.

Name the physical quantity which has unit but no dimesion

two forces 3N and 4N are acting at an angle 120* between them.find the resultant force in magnitude and direction.