In the nucleus of an atom, there are 18 protons and 20 neutrons. What are the atomic number and mass number of this isotope?

Heat is also called A electrical energy B nuclear energy C chemical energy D thermal energy

Which equation describes average speed? A-Average speed = Total distance x Total time B-Average speed = Sum of instantaneous speeds C-Average speed = Total distance : Total time D-Average speed = Total time : Total distance

In a digital multimeter, what changes inside the meter when you push the button to change from 200v range to the 20v range? by what factor does it change? does it increase or decrease?

Two particles are separated by a certain distance. the force of gravitational interaction between them is f0. now the separation between the particles is tripled. find the new force of gravitational interaction f1.

Gravity is affected by

Why does ice generally have very little friction when it is in contact with other materials?

A stationary speed gun emits a microwave beam at 2.10*10^10Hz. It reflects off a car and returns 1030 Hz higher. What is the speed of the car?

Discuss the changes in potential energy and kinetic energy and total energy for skateboarder going up and down on a half pipe ramp

The diagram below shows rock is affected when water enters cracks in rock, freezes and becomes ice

A vertical piston-cylinder device contains a gas at a pressure of 100 kPa. The piston has a mass of 5 kg and a diameter of 12 cm. Pressure of the gas is to be increased by placing some weights on the piston.