Which substance has the highest density at room temperature?
a. hydrogenc. waterb. oxygend. they are all the same

Ablock of mass 1.5 kg slides down an inclined plane that has an angle of 15. if the inclined plane has no friction and the block starts at a height of 3 m, how much kinetic energy does the block have when it reaches the bottom? acceleration due to gravity is g = 9.8 m/s2. a. 6.8 j b. 50.9 j c. 0 j d. 44.1 j

When an object is heated it contracts. a. true b. false

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?