If you push for an hour against a stationary wall, you do no work

If you lift a five pound object 18 inches how many joules of energy did yo use?

A sister spins her brother in a circle of radius R at angular speed wi. Then the sister decreases her angular speed to wi, with the same radius. How does the magnitude of the brother's centripetal acceleration change when the sister slows down?

If an acid is combined with a base of equal strength, the result will most likely be

Density: Two blocks, A and B, are put in a tank of water. Block A has a density of 1.21 g/cm³. Block B has a density of 1.37 g/cm³. Which will float higher in the water?

Find the acceleration of an 800-kg car that has a net force of 4,000 N acting upon it.

Let T be a linear transformation from a vector space V with dimension 11 onto a vector space W with dimension 7. What is the dimension of the nullspace of T?

What is the fundamental unit for measuring mass in the metric system?

Why are some craters on the moon bigger than others

What object oriented feature can we use to have a single test program, with one set of method calls in which the user can decide which bag implementation (array - or link-based) needs testing?

What might motivate someone to study forensics