An object is falling toward Earth's surface, and its acceleration due to gravity is measured. What is NOT needed to calculate Earth's mass?

Almost all metals occur naturally in the ... state?

Calculate the weight in newtons of a 2.4-kg melon. express your answer to two significant figures and include the appropriate units.

diffraction grating has 5150 lines per centimeter ruled on it. What is the angular separation between the first - and the third-order bright spots on the same side of the central maximum when the grating is illuminated by a beam of light with

The use of fingerprints in identification is not perfect because

Where does crystallization take place?

In a laboratory experiment, a diffraction grating produces an interference pattern on a screen. If the number of slits in (including the slit spacing) the same, then The fringes stay the same brightness and get closer together.

The gravitational potential has a zero value gravitational field in the same place is? Maximum or null indeterminate

In four-seater countries, temperature drops below 0 ° C during peak winter. Why only the frozen surface of the water instead of the whole river and the lake freezes?

Which type of circuit is more useful and why

how much current is in a circuit that includes a 9-volt battery and a bulb with a resistance of 3 ohms?