An 80 kg water skier is being pulled by a speedboat. The force causes her to accelerate at 5 m/s2. calculate the net force that causes the acceleration. (don't forget the unit of measurement)

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

You have two photos of a person walking. one shows the person at the corner of third and main streets, the other shows the person at the corner of tenth and main streets. there are lampposts at every corner in this town, and the first picture shows it to be 10: 32: 00 exactly. the second picture shows it to be 10: 49: 30. you know three facts: (1) all of the clocks are synchronized; (2) there are exactly 12 equal-sized blocks per kilometer in this town; and (3) the streets that cross main in this area are numbered consecutively, with no interruptions. what is the person’s average speed in kilometers per hour?

Why should the wavelength scale of spectroscope be calibrated