An 8.0g particle moving 1.2m/s collides with a 3.0g particle initially at rest. After the collision, each of the particles has a velocity that is directed 30 degrees from the original direction of motion of the 8.0g particle (one 30 degrees up, the other 30 degrees down). What is the speed of the 3.0g particle after the collision?

What happens when a rubber rod is rubbed with a piece of fur?

The heater element of a 120 v toaster is a 5.4 m length of nichrome wire, whose diameter is 0.48 mm. the resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ω·m. the toaster is operated at a voltage of 120 v. (a) what is the power drawn by the toaster? (b) if the cost of electricity is 12 ¢ per kilowatt-hour, and it takes 2 minutes to toast bread, how much does it cost for toasted bread? (c) when the heater element is at room temperature, is the resistivity in the nichrome wire greater than, less than, or equal to it’s resistivity when at operating temperature? explain.

What happens when the number of protons in an atom changes