What forces were acting on the objects dropped in the air? What forces act when dropped in a vacuum?

If your weight is force created by gravity on your body, and therefore is the Earth pulling you down, what is the reaction force?

A cylinder of gas is compressed by a piston from an initial volume of 125 liters to a final volume of 90 liters. The compression occurs at a constant pressure, and the work done on the gas by the piston is 10^4 joules.

The main difference between turbojets and rocket engines is the fact that

How do geologist determine the age of a fault line? What types of evidence is specifically used?

G 1470-kilogram truck moving with a speed of 24.0 m/s runs into the rear end of a 1110-kilogram stationary car. if the collision is completely inelastic, how much kinetic energy is lost in the collision?

An electric circuit consists of a variable resistor connected to a source of constant potential difference. If the resistance of the resistor is doubled, then

What would happen if an electron was added to an atom

Is a stick living, non living or Dead?

A ball player catches a ball 3.24 s after throwing it vertically upward. With what speed did he throw it?

Most metallic ores are produced by which two of processes? a) Metamorphic and Sedimentary b) Igneous and Metamorphic c) Igneous and Sedimentary d) Cementation and Compaction