What is the mass number of a potassium atom that has 20 neutrons

If an object traveling in one direction has s positive velocity, what kind of velocity would the same object traveling in the opposite direction have?

A monochromatic beam of light has a frequency of 7.69 * 10^14 hertz. What is the energy of a photon of this light? (1) 2.59 * 10^-40 J (3) 5.10 * 10^-19 J (2) 6.92 * 10^-31 J (4) 3.90 * 10^-7 J

The active sections that are located along fault lines are called A. seismic gaps. B. seismic risks. C. stress accumulations. D. recurrence gaps

A 2.9 kg ball strikes a wall with a velocity of 8.6 m/s to the left. The ball bounces off with a velocity of 7.3 m/s to the right. If the ball is in contact with the wall for 0.

Why does a truck that is traveling in the opposite direction to you on the Street appear to be moving faster than it would if you were not moving

You are in the lab and are given two rods set up so that the top rod is directly above the bottom one. The two straight rods 50-cm long are separated by a distance of 1.5-mm each with 15 A of current passing through them.

What is the explanation for feather beds being warm

A student wearing frictionless in-line skates on a horizontal surface is pushed by a friend with a constant force of 47 N. How far must the student be pushed, starting from rest, so that her final kinetic energy is 354 J?

Suppose a rocket ship in deep space moves with constant acceleration equal to 9.8 m/s2, which gives the illusion of normal gravity during the flight.

A canoeist on a lake throws a 0.145 kg baseball at 20.0 m/s to a friend in a different canoe. Each canoe with its contents has a mass of 120 kg, and is at rest initially.