Why is friction between moving parts of machines undesirable?

Which of the following are true for E = mc2? a. developed by John Dalton b. implies that a small change in mass produces a great deal of energy c. mainly used for nuclear reactions d. shows the relationship between meters and energy

Which phenomenon occurs when the moon and Earth are aligned with the sun? A. Retrograde motion B. Solstice C. Equinox D. Eclipse Eclipse occurs when the moon and Earth are aligned with the sun.

What gas is released when you burn coal with high amounts of sulfur in it?

Which statement best describes the effect of scientific advances on society? A. They always have a positive impact on society. B. They are inspired by the needs of society. C. they do not affect society beyond the community level. D.

consider a silver wire with a radius of 4.0 x 10^-3 meter. determine the cross sectional area of this wire

What type of waves move energy forward, but the source makes up and down

Why do helium balloons float? Talk about density of atoms and compare to elements in the air.

Identify and describe the metal in table salt

150kg object takes 1.5minutes to travel 2,500 meter straight path it begins the trip traveling 120m/s and decelerates to a velocity of 20m/s whats its acceleration

Which statement is true about the solar system