Provide an example of a force that does work on a system. Then use the work-energy theorem to justify your example. Use your knowledge of the Law of Conservation of Mechanical Energy to evaluate the following scenarios about a frictionless roller coaster if the coaster starts from rest at the top of a hill and then rolls down the hill. A. Where is KE=PE? B. Where is KE=0? C. Where is PE=0?

In the following calculations, be sure to express the answer in standard scientific notation with the appropriate number of significant figures. 6.477 × 10 m² 4.7036 x 102 m x 10

An astronomical unit (AU) is the average distance between the Earth and the Sun, approximately 1.50 × 10° km. The speed of light is about 3.00 x 10° m/s. Express the speed of light in astronomical units per minute. Number Units

I need help on questions 1-3?

A jet airplane reaches 884./kmh on a certain flight. How long does it take to cover 227.m ?

answer 1-4

A map in a pirate’s log gives directions to the location of a buried treasure. The starting location is an old oak tree. According to the map, the treasure’s location is found by proceeding 7.45 paces North from the oak tree and then 6.62 paces Northeast. At this location, an iron pin is sunk into the ground. From the iron pin, walk 2.59 paces South and dig. How far (in paces) from the oak tree is the spot at which digging occurs?

The number of significant digits is set to 2

A person leaves home and walks 6 miles west, then 5 miles southwest. How far from home is she? Round to at least one decimal place. miles In what direction must she walk to head directly home? Round to at least one decimal place. degrees North of East

The number of significant digits is set to 2