Which substance requires the most heat to melt 1 kg of the substance? A. Copper B. Mercury C. Gold D. Helium

Speed (S) of a moving object is calculated from

How many additional valence electrons does fluorine need to have a full valence shell? A. One B. Two C. Eight D. Seven

If the distance between the two mass double what happens to the gravitational force

A basketball player pushes down with a force of 34 N on a basketball thats inflated 9x10^4 Pa. What is the contact diameter between the ball and the floor?

A gardener bought a package containing 3 squash seeds and 3 bean seeds. If just one seed is selected from the package what are the chances that it is a bean seed?

What is the oxidation state of a hydrogen atom bound to an iron atom.?

What evidence can you present for the possibility of time travel?

A ball is being rolled by a normal push of 1000N. it is opposed by friction which has a force of 0.3kN and air resistance which has a force of 23N. Calculate the resultant force.

What was the change in internal energy (chemical energy plus thermal energy) of the person pulling the block?

One of the longer sides of a kite is 39 feet. one of the shorter sides is 25 feet. half the length of the shorter diagonal is 15 feet. what is the area of the kite?