Two cars collide with each other. Before the collision, one car (m = 1300 kg)

is going north at 30 m/s and the other car (m = 900 kg) is going south at 15

m/s. What is the momentum of the system made up of the two cars after the

collision?

Calculate the intensity of the sound waves from an electric guitar's amplifier at a distance of 5.0 m when its power output is equal to each of the following values: a. 0.25 W b. 0.50 W c. 2.0 W

Why does a cheetah run really fast?

The inner and outer surfaces of a 4-m x 10-m brick wall of thickness 20 cm are maintained at temperatures of 168C and 48C, respectively.

an ice cube of density 0.9g/cm3floats in fresh water of density 1g/cm³ what fraction of volume of ice is submerged?

Which of the following is a scalar quantity? A. 8 miles to the south B. 100 feet C. 95 mph west D. 14 m/s up

Which statement would be a valid argument in favor of using nuclear power? There are few negative impacts from mining the fuel. Reactors are safe from natural disasters. There are little to no waste products from fission.

How would you convince somebody that the momentum of an isolated system is constant?

Object A has a charge q on it, object B has a charge q on it, and Object C has a charge 2q on it. These charges are arranged, one each, at the vertices of an equilateral triangle. Which charge has the greatest magnitude electric force on it? a. Ab.

How can Newton's laws be used when addressing the motion of objects?

A plastic rod rubbed with a duster attracts bits of paper becauseof a what force