A pivoted beam supports a load P at one end and a load Q at the other end. The weight of the beam can be ignored.

30 cm 70 cm

P Q

pivot

The beam is balanced.

Which row gives possible values for P and for Q?

P/N Q/N

A 21 7

B 21 9

C 30 10

D 30 70

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 11.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.80 m/s; (b) he is then lifted at the constant speed of 4.80 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 78.0 kg rescue by the force lifting him during each stage

Marvin records scientific data about lake superior. for which property has marvin forgotten to use an si unit of measurement? shore length high temperature low temperature annual precipitation

Another word for electromagnetic energy is a. heat b. force c. matter d. radiation