Other Physics Answers

A spinning wheel has a moment of inertia of 2.50kg.m^2 about its axis of rotation starting from rest,how much constant torque is required to bring it to an regular speed of 300 rpm in 10.0s?.

A figure skater begins spinning counterclockwise at an angular speed of 4.3 π rad/s. During a 5.0 s interval, she slowly pulls her arms inward and finally spins at 7.7 π rad/s. What is her average angular acceleration during this time interval? Answer in units of rad/s 2 .

A block rest on a horizontal board. the board is gradually tilted upward and the block just

begin to slide when the angle of inclination is 21°,

a. Find the coefficient of static friction between the block and the board

Starting with the definition 1in.=2.54cm

1in.=2.54cm, find the number of kilometers in 1.40 mi

Four point charges (two with q= 2.50 x 10^–6 C and two with q= –2.50 x 10^–6 C) are situated at the corners of a square of side 1.00 m as shown. Find the resultant force that the charge at A will experience due to the charges as the other corners of the squares.

a) A +100-μC charge produces 1.5 T field 2 cm from the charge. Determine the magnitude of velocity of the charge. b) What magnetic field is produced by a charge twice that in part a) 4 cm away from it?

At what depth in the ocean would the water pressure be three times atmospheric pressure? What would be the force on a portion of the hull of a submarine that is 10 cm by 10 cm? If a bubble of air has diameter 5.0 cm starting at that depth, what will be its diameter just as it reaches the surface (assume temperature stays the same)?

Charges of +2.0, +3.0, and -8.0C are placed at the vertices of an equilateral triangle of side 10 cm. Calculate the magnitude of the force acting on the -8.0C charge due to the other two charges.

2. Suppose the distance in question 1 is tripled. What happens to the forces between the two objects?

If you divide the total distance traveled on a car trip (as determined by the

odometer) by the time for the trip, (a) are you calculating the average speed or the

magnitude of the average velocity? (b) Under what circumstances are these two

quantities the same?