Một electron được gia tốc trong điện trường được tạo bởi một hiệu điện thế 2000 V. Nếu thay đổi hiệu điện thế từ 2000 V lên 8000 V thì vận tốc của electron tăng lên:

Oxygen undergoes an isentropic expansion from 120 degree c and 280 kpa absolute to 140 kpa absolute. determine the final temperature of the oxygen and the amount of work per kg of o_2 produced in the process if it is adiabatic.

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?