What is the difference between a rock that shows porphyry and a rock called tuff?

Which of the following is a compound? A) oxygen B) water C) nitrogen D) air

What are the opposite ends of a magnet called?

Calculate the amount of energy produced in joules by 100 - watt light bulb lit for 2.5 hours.

A balloon that weighs 1 n is suspended in air, drifting neither up nor down. (a) how much buoyant force acts on it? (b) what happens if the buoyant force decreases? (c) if the buoyant force increases?

If an automobile is able to travel 400 km on 47.2 l of gasoline, what is the gas mileage in miles per gallon?

A galilean telescope adjusted for a relaxed eye is 36cm long. If the objective lens has a focal length of 40cm, what is the magnification?

If a car goes along a straight road heading east and speeds up from 45 ft/s to 60. ft/s in 5 sec, calculate the acceleration

To generate higher profit margins, producers must work to increase their total supply. increase their total expenses. decrease their customer base. decrease their production costs

Solar energy isn't usually used as the only power source for a reason because what

What particle can be stopped by skin