A 2 kg object travels at 10 m / s and collides with a second 10 kg object that was at rest. After the collision, the 2 kg object moves backwards at 2 m / s.

a) Calculate the initial momentum and kinetic energy. Which of the two quantities is always conserved in a collision?

b) How much is the speed of the second object after the crash worth?

c) How much energy degrades during the crash?

d) If it were an elastic shock, what would be the final speeds?

The charge on an electron is 1.60218 × 10−19 c and its mass is 9.10939 × 10−31 kg. how strong a magnetic field must be experienced by the electron if its path is a circle of radius 5.5 cm? answer in units of t.

An ice-making machine inside a refrigerator operates in a carnot cycle. it takes heat from liquid water at 0.0 degrees celsius and rejects heat to a room at a temperature of 19.2 degrees celsius. suppose that liquid water with a mass of 76.3kg at 0.0 degrees celsius is converted to ice at the same temperature. take the heat of fusion for water to be l_f = 3.34*10^5 j/kg. how much energy e must be supplied to the device? express your answer in joules.

What is the thinnest soap film (excluding the case of zero thickness) that appears black when illuminated with light with a wavelength of 480 ? the index of refraction of the film is 1.34, and there is air on both sides of the film. express your answer in nanometers. hint 1. how to approach th