Physics Answers

In the process of rubbing the lenses of the eyeglasses, 6.28x1010 electrons were transferred. What is the change in their masses?

A star having rotational inertia of 10 1049 kgm2 is rotating at an angular speed of 2.0 revolutions per month about its axis. The only force on it is the force of gravitation. When its nuclear fuel is exhausted, it shrinks to a neutron star having rotational inertia of 6.0 x 1048 kgm². Determine the angular speed of the neutron star in revolutions per month.

A star having rotational inertia of 10 1049 kgm2 is rotating at an angular speed of 2.0 revolutions per month about its axis. The only force on it is the force of gravitation. When its nuclear fuel is exhausted, it shrinks to a neutron star having rotational inertia of 6.0 x 1048 kgm². Determine the angular speed of the neutron star in revolutions per month.

The max magnetic field strength of an electromagnetic field is 5 x 10^-6 T. Calculate the maximum electric field strength if the wave is traveling in a medium in which the speed of the wave is 0.75c

An object with radius = 80 cm, starts from rest and rotates through an angle of 900 degrees in 2 minutes.

Determine the angular displacement, in radians (use pi = 3.14, answer to 1 decimal place)

A force function is given by the equation. Find the work done by this force when displacing an object from to.

Formula 1 cars should be fast to win a race. How much should the power (in horsepower) of a Formula 1 racing car should be to provide  energy in a horizontal level racetrack in 3 minutes

A car has a mass of 1500 kg moves with a speed of 40 m/s. If the car speeds up to 50 m/s. How much is the work done by the car engine?

a machinist was tasked to insert an aluminum piston into a steel cylinder. the inside diameters of the cylinder and of the piston are 0.500 m and 0. 4998 m, respectively, at 25 degree Celsius. To what temperature must the be heated to obtain a perfect fir?

the distance between two consecutive threads on micrometer screw gauge is