1. In the laboratory, the life time of a particle moving with speed 2.8 x 10^10 cm/s is found to be 2.5 x 10^-7.

Calculate the proper life of the particle.

Concerning the planetary orbits, why was Copernicus somewhat inaccurate? A. He suggested the orbits were elliptical. B. He suggested the orbits were circles. C. He suggested the orbits were identical. D. He suggested the orbits were equidistant.

It takes 50.0 J to push a large box 4.00 m across a floor. Assuming the push is in the same direction as the move, what is the magnitude of the force on the box?

What is the distance between the sun and the earth?

In an AC circuit that contains a resistor, a capacitor, and an inductor, impedance replaces the DC concept of resistance. Explain briefly the difference between the two quantities.

Why are atoms in a covalent bond usually a certain distance away from each other?

How do particles move when a transverse wave passes through a medium?

Which of the following is an elastic collision? A vase falling to the floor and shattering B. Two cars colliding and sticking together C. A wad of gum sticking to a window D. A tennis racquet hitting a ball

What evidence shows that our universe is expanding?

Which of the following is used to determine if a star is moving closer to Earth?

The approximate length of an unsharpened No. 2 pencil is (1) 2.0 * 10^-2 m (3) 2.0 * 10^0 m (2) 2.0 * 10^-1 m (4) 2.0 * 10^1 m