If a helicopter's mass is 4,500kg and the net force on it is 18,000 N upward, what is its acceleration?

The early workers in spectroscopy (Fraunhofer with the solar spectrum, Bunsen and Kirchhoff with laboratory spectra) discovered what very significant fact about the spectra produced by hot gases, such as elements heated in a flame?

As a spherical ammonia vapor bubble rises in liquid ammonia, its diameter changes from 1 cm to 3 cm. Calculate the amount of work produced by this bubble, in kJ, if the surface tension of ammonia is 0.07 N/m.

What remains constant during the trajectory of an object

6 foot waves carries more energy than a 3 foot waves

Is it possible to walk for ten seconds at high speed and have 0 velocity? If so, provide an example. If not, explain why.

Why does it seem harder to start sliding a couch across a carpeted floor than it oes to keep it moving?

Energy due to the motion of an object is called

What is a thick cuticle layer in drought conditions?

All atoms of an element have the same?

Select the correct answer. When waves travel through water, why do the moving water particles continue to return to their starting position? A: Waves transfer matter, but not energy. B:Waves transfer both matter and energy.