Which protects a cell and forms it's boundary

Batteries are made of two metals with different electron affinities. What does the phrase "electron affinity" mean and how does this affinity affect the voltage of the battery?

A light bulb is plugged into a 120-volt outlet and has a 0.7 a current in it. what is the power rating of the light bulb?

Calculate the potential energy of a 20-kg sled at 40 meters

Humpty Dumpty (12 kg) sat on a wall (2 m high). What was his potential energy, before his great fall? A. 235.2 J B. 235.2 N C. 24 J D. 246.1 W

Suggest a form of renewable energy that could be used to power an electric ticket machine that only needs to work during daylight hours

If you are asked to determine an objects speed, what information must you have? A: distance and period of time B: distance and direction C: period of time and direction D: distance and change in position

What is the kinetic energy of a 1150 kg sports car traveling down the road with a speed of 29 m/s?

3. A 2,000-kilogram railroad car moving at 5 m/sec to the east collides with a 6,000-kilogram railroad car moving at 3 m/sec to the west. If the cars couple together, what is their velocity after the collision?

A pendulum swings with amplitude. 02 m and period of 2 s what is its maximum speed

What bone cells respond to stress?