A pulley system lifts a 500-lb. block 2.0 feet with an effort of only 50 lb. If the 50 lb. moves 30 feet, calculate the efficiency of the pulley system.

A 500 kg satellite is placed in a circular orbit 7500 km above the surface of the earth. At this elevation, the acceleration of gravity is 4.09 m/s2. Knowing that its orbital speed is 20,000 km/h, determine the kinetic energy of the satellite

A toaster can be considered to be a heat engine that does no work. Heat flows through the toaster coils without being transformed into mechanical energy. What is the thermal effeciency of this example of a heat engine? a) 0.50 b) 1 c) 0 d) - 1

The electromagnetic spectrum diagram is put together by comparing what two things?

Winter storms get their energy from the clash of two?

What element is used as a source of radiation in smoke detectors?

Define the term volt.

A baseball player was hit by a baseball in the left eye and complains of double vision. What should you do? A. Restrict spinal movement B. Assess pupillary response C. Perform a detailed exam D. Apply ice to orbit

An approaching storm is moving at 15 km an hour what do you need to know to determine its velocity

How did astronomers precisely determine the length of an Astronomical Unit in the 1960s?

If a 1.50 kg mass revolves at the end of a string 0.50 m long, and its tangential speed is 6.0 m/s, calculate the centripetal force.