Why would adding oil to the moving parts of a machine increase its efficiency?

Question 79 : You have noticed dust, debris, and toner particles inside a laser printer. You need to vacuum the inside of the laser printer. What should you do first?

An electric heating element has a resistance of 16 Ω and is connected to a voltage of 120 V. How much current will flow in this circuit? a) I=E/Rb) I=120/16c) I=7.5 A

A pipe 0.570 m long and closed at one end is filled with an unknown gas. The third lowest harmonic frequency for the pipe is 780 Hz.

You drop a 2 kg book to a friend who stand on the ground at distance D=10.0 m below, if your friends out streched hand at distance d=1.50 m above the ground.

A sample of glass has a mass of 15 g and takes up 14.3 cm 3 of space. What is the density? If you drop a piece of the same glass into a graduated cylinder and the water level rises 13 ml, what is the mass of the glass?

Which electromagnetic wave has the shortest wavelength? (A. Radio waves b. X-rays c. infrared rays or d. Visible light)

Which mixture can be separated based on differences in particle size of the components

What happens in an open circuit

When analyzing forces, it is allowable to break the motion and forces into horizontal and vertical components.

What is the density of a rock which has a mass of 35 grams and a volume of 7.0 cubic centimeters?