a custodian pulls a vacuum 13.5 m with a 33.9 N force at a 55 degree angle, against a 14.1 N friction force. Find the work done by the custodian.

A man uses a lever jack to lift a 2.00 x 10^3 kg car to change a tire. Each stroke of the jack lifts the car a distance of 5.00 x 10^-3 m. The vertical displacement of the handle is 0.75 m for each stroke.

According to the chart, which region of the country would be considered the most heavily religious? A) Midwest B) Northeast C) South D) West

Which of the following is an example of diffraction? A. Hearing a band play through an open doorway without seeing them. B. Sitting in a room and watching a band play. C. Playing in a band. D. None of these examples show diffraction.

An object is inside a room that has a constant temperature of 292 K. Via radiation, the object emits three times as much power as it absorbs from the room.

Which of these statements are true about scientific theories and laws? Theories are untested. Laws are untested. Laws are often expressed as math formulas. A law is the same as a theory. Theories are not opinions.

What holds the atoms together in a covalent bond

The sun is the centermost star of our solar system. a. True b. False

When an electron moves from a lower to a higher energy level

Which of the following is all matter made of? A. Hot particles B. Cold particles C. Constantly moving particles D. Nonmoving particles

Which of the following has longest wavelength, a) blue light b) red light c) x-rays d) gamma rays?