A train travels 79 kilometers in 4 hours and then 65 kilometers in 3 hours what is it average speed

Give two examples of work being done on a baseball

Maria and Sarah made a set of paper cup telephones. First the girls punched a hole in the bottom of each cup. Then they connected the cups with a very long piece of string, knotted in the bottom of each cup.

Determine the mechanical energy of this object: a 1-kg ball rolls on the ground at 2 m/s.

What happens when a blaring siren moves away from you

Which state has no active volcanoes A. California B. Hawaii C. New Youk D. Washington

A weather balloon is inflated to a volume of 2.2 x 10^3 L with 374 g of helium. What is the density of helium in grams per liter?

What is the result of a mutation during replication A: the strands are different B: the strands are identical c: the strands are broken D: the strands are continuous

What is ___ heating of a liquid__ gas to liquid

A gate in an irrigation canal is constructed in the form of a trapezoid 2 m wide at the bottom, 38 m wide at the top, and 2 m high. It is placed vertically in the canal so that the water just covers the gate.

A machine with a mechanical advantage of 10 is used to produce an output force of 250 newtons. What input force is applied to this machine