The Principle of Conservation of Linear Momentum

Two friends, Al and Jo, have a combined mass of 168 kg. At an ice skating rink they stand close together on skates, at rest and facing each other, with a compressed spring between them. The spring is kept from pushing them apart because they are holding each other. When they release their arms, Al moves off in one direction at a speed of 0.90 m/s, while Jo moves off in the opposite direction at a speed of 1.2 m/s. Assuming that friction is negligible, find Al's mass.

word problem

a. What is the frequency of this motion? b. When is the mass first at the position x= -7.8cm

Pressure

Suppose that when you ride on your 7.70-kg bike the weight of you and the bike is supported equally by the two tires. If the guage pressure in the tires is 70.5 lb/in^2 and the area of contact between each tire and the road is 7.13 cm^2, what is your weight? Show your work.

Archimedes principle and buoyancy

Archimedes principle and buoyancy

mathematical explanation

I need a mathematical explanation of part a in question 25 of the attached jpeg file. Find the height...