You ride your skateboard to school and tell all your friends your rode at speed of 25 miles per hour. They know this cannot be true because they know when you left the house and when you arrived at school
how far school is from your house and what time school starts
the distance between your house and school and how long it took you to get there
the distance between school and your house and the direction you traveled

Suppose you use a machine that gives you a mechanical advantage of 2 to achieve an output force of 30newtons what must the input force be

In order to place a satellite into orbit, it requires enough fuel to supply the necessary mechanical energy. into what types of mechanical energy does the fuel get transformed?

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?