What type of change had occurred when a nail rusts

A strong lightning bolt transfers about 24C to Earth. How many electrons are transferred? The elementary charge is 1.60218x10^-19 C

Rannan wants to perform a scientific experiment. He writes out a systematic process that involves him making observations and then forming his opinion about those observations.

A hiker determines the length of a lake by listening for the echo of her shout reflected by a cliff at the far end of the lake. She hears the echo 2.9 s after shouting. The speed of sound in air is 343 m/s. Determine the length of the lake.

A billiard ball moving at 6.00 m/s strikes a stationary ball of the same mass. after the collision, the first ball moves at 5.39 m/s at an angle of 26.0° with respect to the original line of motion.

If your friend asked, "Why are plastics good insulators?" you would reply: 1. In order for electricity to flow you must have atoms that are able to easily lose or accept an electron.

A protostar forms once the nebular cloud condenses and the core begins

Current is the flow of what?

Why might an electromagnet be used to pick up old cars in junk yards? a. Electromagnets are inexpensive and easily create revenue. b. Electromagnets are powerful and can be turned on and off easily. c.

The average radius of Mars is 3,397 km. If Mars completes one rotation in 24.6 hours, what is the tangential speed of objects on the planet's surface? Round your answer to the nearest whole number.

A car with a mass of 1,500 kg doubles its speed from 50 km/h to 100 km/h. by how many times does the kinetic energy of the car increase