How many days will it take for one half of the original amount of a radioactive substance to decay if the half-life is 30 days?

a. 3 days

b. 15 days

c. 30 days

d. 60 days

Which is true energy cant be created but can disappear into nowhere or energy is able to be transferred from one into another or all moving objects including atoms have potential energy or an arrow stretched back on a bow is an example of kinetic

The solo instrument in spring from the four seasons by vivaldi is the:

If Dave drives a car for 85 km/hr for 3 hours how for does he travel?

A ball is launched with an initial velocity of 28.5 m/s at a 45° angle from the top of a cliff that is 10.0 m above the water below. Use g = 9.80 m/s2 to simplify the calculations.

A device that uses electricity and magnetism to created motion

Add the following displacement vectors: 12 m south and 15 m 55° E of N?

And electric current is produced by which of the following processes? A. Electrical resistance B. Transfer of protons C. Convection currents D. Electromagnetic induction

The basic building block of life is

What is the reason for Mary's resemblance to her mother. Mary's relatives and friends feel she had her mothers feature

Is a balance scale used to describe how much matter is in an object