An atom of lead has the atomic number 82 and a mass number of 207. How many neutrons does this atom of lead have?

Mass = 386g volume = 20cm3 what is the density=

Which one of the following is a example of chemical energy?

The ozone layer is found in which layer of the atmosphere? question 4 options:

All planets have magnetic fields. T or F

True or false? Any change in an objects motion is called velocity

The power rating of a vacuum cleaner is 0.8 kilowatts. If you use the vacuum cleaner for 2.5 hours, how much energy does it use?

Which has more gravitational potential energy - - a cliff diver at the top of the cliff or a cliff diver at the bottom of the cliff?

A skydiver with a mass of 60 kg jumps from an airplane. Five seconds after jumping the force of air resistance is 300 N. What is the acceleration of the sky diver, five seconds after jumping?

How many basic wave forms are there? A.) 1 B.) 2 C.) 3 D.) 4

How much power is reqired to lift a 10-n box 2 meters