Physics Answers

True or false the number of coils and the number of batteries are factors that can affect the strength of an

Electromagnet

A ray of light is incident through glass, with refractive index 1.52, on an interference separating glass and water with refractive index 1.32. What is the angle of refraction if the angle of incidence of the ray in glass is 25°?

What is the wavelength of EM radiation that ejects 2.00 -eV electrons from calcium metal, given that the binding energy is 2.71 eV? What type of EM radiation is this?

The temperature of 47 degree celsius was recorded as the highest temperature in Thailand in 52 years. What is the temperature in Kelvin

If you push against a stationary car, are you doing any work?

. A man lifts a box weighing 56N through a vertical height 1.3 m and then walks horizontally for 2.2 m at constant speed while holding the box. What is the work done by the student? *

The steel rail road track is 20 cm long at 10 degree celsius. How much longer is the track at 20 degree celsius? The coefficient of linear expansion of steel is 1.27x10-5 -K.

Dindy of mass 48 kg wears heels with an area of 2 cm² in contact with ground. Calculate the

pressure exerted by the girl on the ground.

A copper wire is 2.50 m long and has a diameter of 2.5 mm. How much current will it draw when connected to a 3.0 V source?

What is the mass of a lead sphere whose diameter is 0.50 m given density of steel is 7800 kg/m3 ?