Suppose a vacuum cleaner uses 120 J of electrical energy is 45 J are used to pull air into the vacuum cleaner how efficient is the vacuum cleaner

What Is Dipole moment?

Which of the following groups of atoms are most likely to have similar properties? nickel (28), calcium (20), bromine (35) aluminum (13), germanium (32), antimony (51) oxygen (8), selenium (34), tellurium (52)

Read the excerpt from Dr. Martin Luther King's "Letter from Birmingham Jail." If I sought to answer all the criticisms that cross my desk, my secretaries would have little time for anything other than such correspondence in the course of the day,

A solid block of metal has a density of 6 kg/m^3. what happens to the density if the block is cut in half?

Determine the kinetic energy of a 3.2 kg roller coaster car that is moving with a speed of 15.6 m/s.

Molecules at room temperature move freely. What happens to the molecules when heat is removed until it freezes? Molecules group together Molecules slow down and contract Molecules speed up and expand Molecules move freely

A spring is used in a lab. It is vibrated at different frequencies and the wavelength is recorded. Using the graph of the data, what is the relationship found between frequency and wavelength? A) Frequency and wavelength are inversely related.

How do you describe the frequency of waves perceived by the observer from the moment the source appears to the moment it disappears?

What causes the stars to appear to move across the night sky?

Two waves collide and the temporary combined waves that results is smaller that the original wave. which term describes this interaction? A. destructive interference B. standing wave formation C. diffraction D. constructive interference