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Questions in physics

[Homework Help] If a rock is thrown vertically upward from the surface of Mars with velocity of [tex]$25 m / s$[/tex], its height (in meters) after [tex]$t$[/tex] seconds is [tex]$h=25 t-1.86 t^2$[/tex]. (a) What is the velocity (in [tex]$m / s$[/tex]) of the rock after 2 s? (b) What is the velocity (in [tex]$m / s$[/tex]) of the rock when its height is 70 m on its way up? On its way down? (Round your answers to two decimal places.)

[Homework Help] Select the correct answer. What can be found by counting the number of troughs per second in a wave diagram? A. amplitude B. direction C. frequency D. speed E. wavelength

[Homework Help] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Homework Help] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Homework Help] Action and reaction forces are described by which of Newton's laws of motion? A. first B. second C. third D. fourth

[Homework Help] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Homework Help] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Homework Help] Which protective device shuts off an electrical circuit when it is destroyed? A. Ground-fault circuit-interrupter B. Fuse C. Circuit breaker D. None of the above

[Homework Help] Which statement describes the magnetic field inside a bar magnet? A. It points from north to south. B. It points from south to north. C. It forms loops inside the magnet. D. There is no field within the magnet.

[Homework Help] Through which type of material does sound tend to travel at the highest speed? A. Solids B. Liquids C. Sound travels at the same speed in every material. D. Gases