The temperature of 50.0 grams of water was raised to 50.0°C by the addition of 4200 Joules of heat
energy. What was the initial temperature of the
water?

When a comet collides with earth, it adds material to our planet and causes great damage. therefore, a collision like this is a a. destructive force b. constructive force c. geologic process and event d. constructive and destructive force

The first element on the periodic table of elements is carbon. a. true b. false

Atrain travels 74 kilometers in 3 hours, and then 81 kilometers in 5 hours. what is its average speed?