HELP ASAP PLEASE A hopper train car is used for transporting grain. Empty it has a mass of about 28,000 kg. Fully loaded this mass increases to about 91,000 kg. Explain in terms of f=ma (Newton's Second Law) the difference in force needed to accelerate the two different train cars.

Heena wants to measure the volume of a ball that is 24 cm across. how should she set up her equation?

You will be galileo perform the experiment to determine if objects with different mass fall at the same, or different, rates in the air and in a vacuum. (refer to the walk-through video to locate the online lab within the online textbook).

The california mussel (mytilus californianus) attaches itself to a rock or other solid surface with a bundle of filaments known as the byssus. imagine that 15.0 j of work is done to stretch the distal end of the byssus. it releases 10.8 j of thermal energy as it relaxes. what is the resilience of the distal end of the byssus?