Physics Answers

a current of 3A flows past a particular point in a circuit. calculate the charge that passes if the time that the current flow is for 1s

A plate with an area A=0.09m"2 . An electric field E=80 N/C flows through the plate. The angle between the electric field and the surface of the plate is θ=50°.

Find the magnitude of the electric flow.

Water flows through a 2 cm radius hose at a speed of 4 m/s.

What must be the nozzle radius so that the water speed is at 16 m/s?

a) Calculate the intensity of a wave traveling in the air with an amplitude of 2 mm, a frequency of 400 Hz and at a speed of 150 m/sec.

Density of air at sea level is 1.225 Kg/m³.

A toroid core has N = 1200 turns, length L = 80cm, cross-sectional area A = 60cm2 , current I = 1.5A. Compute B and H. Assume an empty core. 

What is the frequency of an acrobat swinging on a trapeze if the cables are approximately 2.5 m long?

A shopper in a supermarket pushes a cart with a force of 35 N directed at an angle of 25° downward from the horizontal. Find the work done by the shopper on the cart as the shopper moves along a 50.0 m length of aisle.

If ΔT is the difference in temperature between a hot and a cold medium, the rate of heat transfer via conduction is proportional to ΔT to the power 

1

2

3

4

How much will a 1-km steel bridge expand due to a 10 K temperature change? 

1.2 m

12 cm

12 m

6 cm

An astronomical telescope has an angular magnification of 40 times. If the diameter of the objective is 12 cm and the length of the tube is 1m, calculate the focal length of the objective and the diameter of the exit pupil.