Which activity is an example of a chemical change?

a. sugar dissolving in water

b. water evaporating into water wapor

c. lighting a match

d. freezing water

Why is it difficult to use the law of conservation of energy to calculate the effects of a collision? O A. Energy is not conserved. O B. Energy is only conserved during perfectly inelastic collisions. O C.

Rubbing your hands together warms them by converting work into thermal energy. If a woman rubs her hands back and forth for a total of 12 rubs, at a distance of 7.50 cm per rub, and with a frictional force of 45.

A person whose mass is m = 70.0 kg m=70.0 kg steps on a mechanical bathroom scale placed on an inclined plane that makes the angle α = 22.3 ∘ α=22.3∘ with the horizontal. What is the reading on the scale?

Which of these is not shared by bohrs model and the modern atomic model? A) both have electrons surrounding the atomic nucleus.

From the expression for EE obtained in Problem 22.42,22.42, find the expressions for the electric potential V as a function of r, both inside and outside the cylinder. Let V=0 at the surface of the cylinder.

An arrow is shot upward on mars from ground level with a velocity of 60 meters per second. Its height (in meters) after t seconds is given by 2 s (t) = 60t - 1.9t^2.

What are (a) the lowest frequency, (b) the second lowest frequency, (c) the third lowest frequency of transverse vibrations on a wire that is 10.0m long, has a mass of 100g, and is stretched under tension of 250 N?

Why is a rock salt crystal likely to shatter when struck

Find the speed required to throw a ball straight up and have it return 6 seconds later. neglect air resistance. how high does the ball go?

Do all electromagnetic waves travel at the speed of light, carry energy, and travel through a vacuum?