Physics Answers

The deepest point in the ocean is in the Mariana Trench, about 11 km deep, in the Pacific. The pressure at this depth is huge, about 1.13 x 10^8 Pa. (a) Calculate the change in volume of 1.00 m3 of seawater carried from the surface to this deepest point. (b) The density of seawater at the surface is 1.03 x 10^3 kg/m3. Find its density at the bottom. (c) Explain whether or when it is a good approximation to think of water as incompressible.

A piece of resistant wire of diametre of 0.8mm and resistant is 6ohm's has a resistivity of 8.8*10^4 metre.calculate the length of the wire take π=22/7

The angle of incidence is 40°, what is the value of the angle of refraction when the light travels from water to light flint glass?

A constant torque of 35 Nm is applied to a wheel whose moment of inertia is 1.5 kg m². Find the Angular Acceleration. Also, find the angular speed at the end of 25 seconds

The deepest point in the ocean is in the Mariana Trench, about 11 km deep, in the Pacific. The pressure at this depth is huge, about 1.13 x 10^8 Pa. (a) Calculate the change in volume of 1.00 m3 of seawater carried from the surface to this deepest point. (b) The density of seawater at the surface is 1.03 x 10^3 kg/m3. Find its density at the bottom. (c) Explain whether or when it is a good approximation to think of water as incompressible.l

A wooden bar mass of 2 kg and length of 1.0 m, is placed vertically on the ground. If the bar is released to fall to the ground and its foot is not move, Find a) Kinetic energy when the bar hit the ground b) Speed of the end point of the bar when its hit the ground

Find the momenta of the following problems.

a 20-kg bicycle moving at 7m/s northward

Unpolarized light with an intensity of 120 W falls on a polarizer and analyser. The angle between the transmission axes of the polarizer and analyser is 72°. What is the intensity of the light leaving the analyser, reaching the photocell?

Two vectors are given: 𝑥⃗ = 3𝑖⃗ + 2𝑗⃗, 𝑦⃗ = 2𝑖⃗ − 8𝑗⃗.

a) Draw these vectors in Cartesian coordinate system.

b) Represent both of these vectors in magnitude, direction notation.

c) Represent vector 2𝑥⃗ + 3𝑦⃗ in magnitude, direction notation.

In a dentist's office an X-ray of a tooth is taken using X-rays that have a frequency of 6.30 x 10¹⁸ Hz. What is the wavelength in vacuum of these X-rays?