The atmosphere is a mixture of gases. It is mostly composed of

In which century was the DNA database established? The DNA database was established in the century

A boy is running a 100 m relay. What is main kind of energy does he possess at this time. a) gravitational b) kinetic c) elastic potential

A spaceship is traveling directly away from earth with speed 4t2+6 km/s. At time t=0 is is 250 km from earth. How far is it from earth one minute after time t=0? Include units in your answer.

A white dwarf can dramatically increase in brightness only if it (a) has another star nearby; (b) can avoid nuclear fusion in its core; (c) is spinning very rapidly; (d) is descended from a very massive star.

Air that contains all of the moisture that it can hold is known as

Is platinum carbonate naturally occurring or human made?

A 230-km-long high-voltage transmission line 2.0 cm in diameter carries a steady current of 1,100 A. If the conductor is copper with a free charge density of 8.

A student uses an audio oscillator of adjustable frequency to measure the depth of a water well. Two successive resonant frequencies are heard at 187 Hz and 209 Hz. What is the depth of the well? The speed of sound in air is 344 m/s.

A 0.025-kilogram bullet is fired from a rifle by an unbalanced force of 200. newtons. if the force acts on the bullet for 0.1 second, what is the maximum speed attained by the bullet?

What two models are used to describe how light behaves