1,000 J of energy are needed to melt 10 g of a solid substance that is already at its melting point. What is the heat of fusion of the substance? A. 10,000 J/g

B. 100 J/g

C. 0.01 J/g

D. 1,000 J/g

Which of the following are considered noble gases? a. bromine b. neon c. argon d. chlorine

A2000 kg car is rounding a curve of radius 200 m on a level road. the maximum frictional force the road can exert on the tires of the car is 4000 n. what is the highest speed at which the car can round the curve?

Lightning is an example of what phenomenon? a release of a large amount of energy an absorption of a large amount of energy a natural electric circuit a natural electric current