Match the device with its task. i. Turbine
ii. Fan
iii. Compressor
iv. Pump
a. Increases the pressure of a gas slightly and is mainly used to move a gas
b. Increases pressure of gases and vapors
c. Increases pressure for liquids
d. Produces shaft work

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?

1. jay fills a wagon with sand (about 20 kg) and pulls it with a rope 30 m along the beach. he holds the rope 25° above the horizontal. the rope exerts a 20-n tension force on the wagon. how much work does the rope do on the wagon?

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e