Physics Answers

Two concentric solenoids carry currents in opposite directions. The inner solenoid has 50 turns per cm. The outer

solenoid has 20 turns per cm. The inner coil carries a current of 0.5 A. (a) Calculate the current needed in the

outer coil so that its fields cancels the field produced by the inner coil. (b) How large a field is produced by the

inner coil?

2. Starting from one oasis, a camel walks 25 km in a direction 30° South of West and then walks 30 km toward the North to a second oasis. What distance separates the two oases? You may use triangle method or component method.

A rectangular lot has an area of 30m^2. If its length is 10ft, what is its width in inches? 

A spring has a force constant of 80 N/m, it vibrates with a frequency of 7 Hz.

Calculate the,

a) period;

b) angular frequency;

c) mass of the spring.

The least wave length of the electro,magnetic spectrum

(P+a/V) (V-b) = RT

What is the work done by gravity when a wooden block of mass 2 kg slides 3 m down a slope inclined at 30°?

A. 3 J

B. 29.43 J

C. 6 J

D. 58.86 J

A basketball of mass 0.0400 kg is dropped from a height of 5.00 m to the ground and bounces back to a height of 3.00 m.

a. On its way down, how much potential energy does the ball lose?

b. On its way back, how much potential energy does the ball regain?

Calculate the molality of a sulfuric acid solution containing 24.4 g of sulfuric acid in 198 g of water. The molar mass of sulfuric acid is 98.09 g.

iron crystallizes in a bcc latics with a unit cell length of 5.20armstrong at 20 degree centigrate calculate the atomic radiun of iron crystal