An astronaut on another planet drops a 1-kg rock from rest and finds that it falls a vertical distance of 2.5 meters in one second. on this planet, the rock has a weight of: (hint: use d = 1/2 g t^2 to find g; then use w = mg to find weight.)

Which of these would be best explained by the Doppler effect? A) the change in frequency as you shorten a guitar string. B) the change in pitch heard as an ambulance approaches you. C) the change in volume as a train pulls away from the station.

In the case of friction, as well as the resistor, conservation of energy cannot be violated. If it appears energy is appearing from nowhere, there is something being overlooked.

In the absence of external forces, every particle continues in its state of rest or straight and uniform movement with respect to an inertial or Galilean reference system. summarize this phrase from galileo galilei in your own words

What is her mass on the moon, where g=1.62m/s2?

Eight grams of water changes from liquid to vapor at a pressure of one atmosphere. In the process, the volume changes from 0.8 cm³ to 674 cm³. The latent heat of vaporization of water is 2.26 * 10⁶ J/kg. Find the work done. Answer in units of J.

If almost any system in stable equilibrium is slightly disturbed, it will then exhibit simple harmonic motion because 1. the change in potential energy is proportional to the cube of the displacement from the equilibrium position. 2.

Is the following statement true or false? Nuclear fission occurs naturally in stars.

Why is it useful to calculate average speed?

Which describes freefall

Suppose you were examining a pulsing radio signal from a stellar remnant in a distant part of the Milky Way.