A teacher placed 80 g of ice in a sealed plastic container at room temperature.
How many grams of liquid water will be in the plastic container when the ice
has melted?
A. Slightly less than 80 g
B. Exactly 80 g
C. Slightly more than 80 g
D. The exact amount is unknown.

One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a small patch of light on the far wall. you see that the patch of light seems to be a circular diffraction pattern. it appears that the central maximum is about 1 cm across and you estimate that the distance from the window shade to the wall is about 3 m. what is (a) the average wavelength of sunlight? (b) the diameter of the pinhole?

1400 kg car has a speed of 27 m/s. if it takes 7 s to stop the car, what is the impulse and the average force acting on the car?

An inclined plane wrapped around a metal shaft is a a. lever b. screw c. pulley d. wedge