How can one explain the fact that nearly all other galaxies appear to be moving farther away from us?

a) the universe is expanding b) the apparent motion is just an optical illusion

a block of wood of mass 10kg and dimension 40cmx25cmx10cm is placed on a table top. find the pressure exerted if the box lies on the tabletop with sides of dimensions; a. 10cmx25cm b. 40cmx10cm

Why do automobiles rust more easily in wet climates than drier climates?

A block slides down a slope inclined at 37 degrees. If the slope is frictionless and the block starts off at rest, how fast is it moving after it has traveled 1 meter along the plane? Apply energy-conservation principles to solve.

What may be a serious side effect of anti-depressants specific in adolescents? Stomach upset Hallucinations Migraines Suicidal ideation

What is a gravitational force? give two examples to illustrate it.

Calculate the wavelength and frequency of the radiation emitted by the electronic transition from the 10th to the 9th excited state of hydrogen.

An unknown fluid has a specific gravity of 0.750. What is the volume of 22.5 kg of this fluid? A. 10 L B. 20 L C. 30 L D. 40 L

What kind of tide is responsible for extreme tides

What does the speed of sound depend on? A. Medium that the sound travels through B. Acoustics C. Frequency of the sound D. Loudness of the sound

Which of these is not a source of the shock waves that lead to protostars?