Physics Answers

A uniform magnetic field its intensity is 3x10-3 T passes an area of the coil with 100 turns which makes 60 angles with the coil. What is the area of the coil if the magnetic flux is 0.15 Wb?

Light traveling in glass n=3/2 is incident on-air n=1. What is the angle of incidence that causes the light to experience total internal reflection?

At 0.0°C and 1.00 atm, 1.00 mol of a gas occupies a volume of 0.0224 m³.

a) What is the number density?

b) Estimate the average distance between the molecules.

c) If the gas is nitrogen (N₂), the principal component of air, what is the total mass? Molar mass of Nitrogen is 14.00674 g/mol.

d) If the gas is nitrogen (N₂), the principal component of air, what is the mass density? Molar mass of Nitrogen is 14.00674 g/mol.

In a certain bimetallic strip, the brass strip is 0.100% longer than the steel strip at a temperature of 287°C. At what temperature do the two strips have the same length? Coefficients of linear expansion for steel α = 12.0 × 10⁻⁶ K⁻¹ and for brass α = 19.0 × 10⁻⁶ K⁻¹

A scuba diver is in fresh water has an air tank with a volume of 0.0100 m³. The air in the tank is initially at a pressure of 1.00 × 10⁷ Pa. Assume that the diver breathes 0.500 L/s of air. Density of fresh water is 1.00 × 10³ kg/m³.

How long will the tank last at depths of 4.10 m?

Incandescent lightbulbs are filled with an inert gas to lengthen the filament life. With the current off (at T = 20.0°C), the gas inside a lightbulb has a pressure of 126 kPa. When the bulb is burning, the temperature rises to 83.7°C. What is the pressure at the higher temperature?

The density of copper at 293 K is 8,940 kg/m³ and its linear expansion coefficient is 17.0 x 10⁻⁶ K⁻¹. Consider a hot cube of copper that is 1.0 cm on a side when its temperature is 1.356 K. What is the cube’s mass? 

An object is placed at a distance of 4.5 cm to the left of a convex lens A of focal length 4 cm . The screen is removed and the image is used as an object for diverging lens B of focal length 2 cm so that a real image is formed at a distance of 8 cm from lensB .

Find distance between lens A and lens B.

A solid cylinder of mas 4kg and radius 40cm rotates about its axis with a frequency of 1/pi what is its rotational kinetic energy?

An airplaine in taking off from a field makes a run of 2300ft and leaves the ground in 15.0s from the start. (a) what its acceleration assumed constant? (b) with what speed does it leaves the ground?