If a piece of iron is placed in pure nitrogen, nothing happens. If the in is exposed to air, it begins to rust. What conclusion can you make about air, based on this observation?

Explain what the star looks like to Jane Explain what the star looks like to John Explain why the stars look different between Jane and john

About 35% of the energy from the Sun that reaches our atmosphere is A) reflected. B) obstructed. C) absorbed by land. D) absorbed by oceans.

A rock is thrown off a cliff at an angle of 57° above the horizontal. the cliff is 135 m high. the initial speed of the rock is 24 m/s. (assume the height of the thrower is negligible.

What happens as a result of an increase in the intensity of a sound wave? - the frequency of a soundwave increases. - the velocity of the sound wave decreases. - the energy of the soundwave increases. - the amplitude of the soundwave decreases

As the electric current in a lightbulb is slowly increased the filament glows kore and more brightly. Why does this happen

Why did scientists choose carbon as a base for the atomic mass unit? Which isotope of carbon did they use?

What organelle is found in all animal cells and some plant cells

Basic of Archimedes's principle of how fluid can make body to float and sink.

A bullet is accelerated down the barrel of a gun by hot gases produced in the combustion of gun powder. What is the average force (in N) exerted on a 0.0500 kg bullet to accelerate it to a speed of 625 m/s in a time of 1.10 ms (milliseconds)

Your boss at the Cut-Rate Cuckoo Clock Company wants to save money on materials. You are asked to reduce the balance wheel, which is cylindrical, dimensions to one-third their original values.