An object is dropped from a height of 100m, how long it it in the air

What creates voltage difference in a battery?

Does the surrounding air become warm or cool when vapour phase of h2o condenses? explain.

The quantity t1/2=τ ln 2 is called the half-life of an exponential decay, where τ=RC is the time constant in an RC circuit. The current in a discharging RC circuit drops by half whenever t increases by t1/2. For a circuit with "R=1.0 kΩ and C=4.

How did people years ago find out which side of a magnet was north and which was south?

A trampoline has a spring constant of 3430 N/m how far will the trampoline sink when a 70 kg person steps on it

What is the effect of a magnetic field on a stationary electric charge on a moving electric charge?

A ball is thrown upwards with an initial velocity of 25. o m/s, what is the velocity of the ball at 11.9 m from the ground?

Can rocks be weathered by wind and chemicals in the air

1. if you rub a neutral glass rod with silk, the silk acquires a negative charge. if you rub a neutral glass rob with a rubber rob, the rubber rod acquired a negative charge.

What's a scientific inquiry