If the half - life of a sample of a radioactive substance is 30 seconds, how much would be left after 60 seconds?

A small car meshes with a large truck in a head-on collision. Which of the following statements concerning the magnitude of the momentum change during the collision is correct? (There could be more than one correct choice.

What will water (or air) do when it is less dense than the surrounding water (or air) ? Why?

What are the reactants in the following chemical equation NaCl+AgF=>NaF+AgCl

Match the following: 1. diagonal cross section of a cylinder 2. cross section parallel to the base of a cone 3. shape created when a semi-circle is rotated about the y-axis 4. diagonal cross section through the widest part of a sphere 5.

Block m1 of mass 2m and velocity v0 is traveling to the right (+x) and makes an elastic head-on collision with block m2 of mass m and velocity - 2v0 (i. e., traveling to the left). What is the velocity v1′ of block m1 after the collision?

Stress is a factor that contributes to heart disease risk. true or false

What is the difference between cementation and compaction?

Is it possible for a baseball to have as large a momentum as a much more massive bowling ball

A simple pendulum with length 1.6 m and mass 21 kg is pulled 20◦ from the vertical and released. If it is allowed to swing until it comes to rest, how much energy was converted into heat? The acceleration of gravity is 9.8 m/s 2.

A pulley system has an MA of 4. How much force would be necessary to pull a 200 newton box