If 50% of a radioactive element remains after 4000years what is the half life

The rubbing of one obejct or surface aganist another

You're driving along at 25m/s with your aunt's valuable antiques in the back of your pickup truck when suddenly you see a giant hole in the road 55 m ahead of you. fortunately, your foot is right beside the brake and your reaction time is zero!

What is planetary transit

A 12.70 g bullet has a muzzle velocity (at the moment it leaves the end of a firearm) of 430 m/s when rifle with a weight of 25.0 N. Calculate the recoil speed (in m/s) of the rifle.

Burning oil and coal adds to the atmosphere. A) phosphorous B) carbon dioxide C) oxygen

Is the muzzle velocity a scalar or vector quantity?

How many day does it take the sun to came out?

Using the word "more" to mean "I want another cookie" is an example of a (n) :

Ohm's law is I = V : R. What is the current of a circuit with a 3.0-volt battery and 1.0 ohm of resistance? The current of a circuit with a 3.0-volt battery and 1.0 ohm of resistance is (blank) amps.

Why do marine west coast climates have much precipitation