Sam and Loretta saw a cool experiment on TV and wanted to try it on their own. First, they poured sand into a plastic cup until it was half full. Next, they used a thermometer to take the sand’s temperature. They then taped a cup upside down on top of the cup with sand in it. Sam and Loretta took turns shaking the cup. They shook it 100 times, un-taped it, and took the sand’s temperature. The temperature was 10 degrees C. They re-taped it, shook it 500 times, un-taped it and took the sand’s temperature. The temperature was 15 degrees C. They re-taped it, shook it 1000 times and then un-taped it and took the sand’s temperature. The temperature was 20 degrees C. 1. What was the Independent Variable for this experiment?

A33.1 g copper object is launched from a 1.5 m 30° steel incline positioned on the floor by being pulled up a string attached to a 50.0 g mass suspended vertically over a pulley. the object is projected towards a glass table where it lands when it is at the point along its trajectory with the lowest speed. it comes to a halt when it clears the opposite edge of the table. it then falls and lands on 9 physics texts each 5 cm thick that are stacked on the floor on the opposite side of the table. assume that the table does not have a ledge and the rectangular object experiences 0.05 n of air resistance as it falls towards the books. how far and how long did the object travel and how fast does it hit the books. assume that at the moment the copper object leaves the incline, the massless string and ideal pulley break off

What makes thermal imaging cameras useful? they can detect differences in color. they can detect differences in wave speeds. they can detect differences in temperature. they can detect mechanical waves.

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?