What is an object that allows some electrons to go through it

What is kinetic energy of a 7.26kg bowling ball that is rolling at a speed of 2m/s?

Give the general name for the type of quantity that has magnitude and acts in a particular direction.

A diver swims in a pool that is 30 m deep. the diver swims 20 m above the bottom. if the diver descends to 10 m above the bottom, what is the absolute pressure?

Technician a says that the coolant heat storage tanks used in some hevs are made of an inner and outer casing with pressurized gas in between for insulation.

1. I drop a little rock from the top of the tower and it takes 1.65 seconds to hit the ground. Calculate the velocity in m/s after 1.10 seconds of freefall and calculate the velocity at impact in mi/hr.

The driver of a car traveling at 32 m/s applies the brakes and undergoes a constant deceleration of 2.25 m/s^2.

You are going to develop some photographic film that involves a chemical reaction between the developer, which you will mix yourself, and a chemical on the surface of the film.

Would time travel mean that parallel universes would be created off our linear time sequence to ensure the universe doesn't collapse itself because of significant events being drastically changed in the way it shapes the universe?

What is the central core of hair

A star with the same mass of the sun has a newly discovered planet whose semi-major axis of 2.48 au and an eccentricity of 0.08. what is the aphelion distance of the new planet