You have a set of calipers that can measure thickness of a few inches with an uncertainity of ±0.005 inches. you measure the thickness of a deck of 52 cards and get 0.590 inch. a) if you now calculate the thickness of 1 card, what is my answer (including uncertainty)
b) you can improve this result by measuring several decks together. if you want to know the thickness of 1 card with an uncertainty of only 0.2 in., how many decks do you need to measure together?

A26 cm object is 18 cm in front of a plane mirror. a ray of light strikes the object and is reflected off the mirror at a 42-degree angle. what is the angle of reflection? degrees what type of image is formed? what is the size of the image? cm

Abatter hits a 0.140-kg baseball that was approaching him at 30 m/s and, as a result, the ball leaves the bat at 40 m/s in the reverse of its original direction. the ball remains in contact with the bat for 2.0 ms. what is the magnitude of the average force exerted by the bat on the ball?

Materials will have different energies associated with the electrons inside them. this is related to how strongly bound they are by their work function. if we sandwich a material with a very low energy between two materials with a high energy, we create a trap for an electron. if this trap is very narrow in one direction in comparison to the others, this is approximately a 1-dimensional box that confines the electron. what is the lowest energy of an electron in the box if the thinnest direction across the materials is 4.81 nm?