Which elements do hydrogen fuel cells combine to produce electricity?

A solo trumpet in an orchestra produces a sound intensity level of 84 db. fifteen more trumpets join the first. how many decibels are produced

Explain the process of adaptive radiation. Give an example.

How do objects become negatively charged using the contact method

As a result of air at the top of a barometer the height of the mercury column is 73.5cm when it should be 75.0 cm the volume of the space above the mercury is 8.0cmcube. Calculate the correct barometric height when the barometer reads 74.

How much force is needed to accelerate a bicycle and rider with a total mass of 80 kg at a rate of 2.0 m/s2? A. 20 N B. 160 N C. 320 N D. 40 N

What studies outer space, the solar system and objects in it

Which of these is the most likely reason why the Steady State Theory of origin of the universe has been rejected?

The formula for calculating power is work divided by time (power = work : time). What are two ways of stating the same relationship? work = power : time, work = power * time, time = work : power, time = work * power, power = work * time

What does newton's first law predict will happen to a person riding in a car that is moving in circular motion?

One of the main reasons steel is used more widely than iron is because it's lighter softer stronger than iron