Five natural materials in a room

A skier starts from rest at the top of a 42 m hill, skis down a 39° incline into a valley, and continues up a 36 m high hill. Both hill heights are measured from the valley floor. Assume that you can neglect friction and the effect of ski poles. 1.

3. what could you do to increase the precision of your measurements? What factors limit the precision of measurements?

Four students measured the acceleration of gravity. The accepted value for their location is 9.78 m/s2. Which student's measurement has the largest percent error?

If a heat engine pulls 4390.0 J of heat from the hot reservoir and exhausts 3582.2 J of heat to the cold reservoir, what was the work done by the engine? What is the efficiency of this engine in percent? (do not enter the percent sign)

On a 600-mile, a pilot can save 30 minutes by increasing her usual speed by 40 mph. find her usual speed

Which of the following best explains why the end of a spoon sticking out of a cup of hot water also gets hot? The hot water causes a chemical reaction to take place in the spoon.

Which of the following is an example of a research topic that is too broad? A. All about hip-hop music B. Hip-hop and the voice of outrage C. Rhyme and meter in hip-hop music D. Block parties and the origins of hip-hop

What's is the power output of an engine that does 60000 J of work in 10 seconds

Which of the following correctly identifies a voltage source and its method of developing electric potential? a. primary cell-heat action on a device b. thermocouple-chemical action c. dry cell-chemical action d. generator-genetic action

A car travels from boston