Which country sent the first artificial satellite into orbit?

What is the speed of a proton after being accelerated from rest through a 5.6x107 V potential difference?

Determine the momentum of a 12 kg cart moving at 5 m/s

A wave that is traveling toward an interface is called the ... ?

A current of I = 3.8 A is passing through a conductor with cross sectional area A = 2.5 x 10^-4 m^2. The charge carriers in the conductor, electrons, have a number density n = 1.3 x 10^27 m^-3. (a) Express the drift velocity of electrons through 1.

You (60 kg) and your friend (80 kg) are both floating on separate tubes next to each other on the San Marcos River. Now you push your friend with 10 Newton. Select all correct statements. A.

What force is responsible for your sensation of weight?

Science fiction movies that include explosion sound effects for battles in space are not scientifically correct. Why is this? A. The sound from an explosion can only be transmitted by air. B.

What is the kinetic energy of a 1,900 kg car moving at 89 km/h?

Why do we study black holes

Calculate the kinetic energy of a charging elephant if its mass is 5,000kg and it moves at 8m/s