Which category of materials allows electrons to travel through them freely

Can reflection occur for all waves?

He mass of Mars is 6.42 * 1023 kg. Its moon Phobos is 9378 kilometers away from Mars and has a mass of 1.06 * 1016 kg. What is the gravitational force between Mars and Phobos? 5.16 * 1015 N 5.16 * 1021 N 4.84 * 1022 N 4.84 * 1025 N

Is the amount of energy in a sound wave per unit of time and is also related to the loudness of a sound.

What type of energy is the energy of motion? A. stored B. Static C. Potential D. Kinetic

A 0.065-kg tennis ball moving to the right with a speed of 15 m/s is struck by a tennis racket, causing it to move to the left with a speed of 15 m/s. if the ball remains in contact with the racquet for 0.

Suppose gene A on the left chromosome is damaged and no longer functions. what form of the trait would show? Why?

I'm completely lost in physics, the Kinematics and dynamics units ... My exam is coming up ... If a biker travelling at 6.4m/s sees biker B 34m ahead on the road travelling 4.7m/s. How far will biker B get before biker A catches him?

When scientists record the volume of a gas, why do they also record the temperature and the pressure

Why is velocity most important in space launch?

A person walks up a stalled escalator in 25 s. When standing on the same escalator, now moving, she is carried up in 16 s. How much time in seconds would it take her to walk up the moving escalator?