A system absorbs 186 kj of heat and the surroundings do 110 kj of work on the system. what is the change in internal energy of the system? express the internal energy in kilojoules to three significant figures.

What cloud brings thunderstorms and lightning?

A balloon is moving with velocity 10 m/s. it releases a stone which comes down the ground in 5 sec. the height of the balloon from the ground at the moment when the stone was dropped is?

7. A neutral aluminum rod is at rest on a foam insulating base. A negatively charged balloon is brought near one end of the rod but not in direct contact with it. In what way, if any, will the charges in the rod be affected?

Places these waves in order from shortest wavelength to longest. •Light waves •Ocean waves •sound waves

Which element will have the greatest attraction for the calcium electrons (if they could combine) ? N P As

What is the most useful property of semi-metals

Which of the following is most likely to have a volume of 75 cm³? A. a stereo system B. a laptop computer C. a portable mp3 player D. a plasma screen television

What was Issac Newton's contribution to our understanding of the fundamental forces of the universe? (Gravity, electromagnetic, strong force, weak force)

Q1) A motor has a rating power of 20 W and motor is used for 10 s. Calculate the energy supplied to the motor,

Why can't the efficiency of a heat engine be 100%?