Silicon is the principal component of glass and has properties of both metals and non-metals. this makes silicon A) Metal B) Non-metal C) Metalloid D) Noble Gas

a plane is flying at 290km/h [E 42° S] relative to the air when the wind velocity is 65km/h [E 25° N]. Calculate the velocity of the plane relative to the ground

As the air on the surface of the earth warms what happens to the density of the air

When temperature increases, all BUT ONE of the following increases as well. That is A) wavelength. B) heat energy. C) kinetic energy. D) molecular motion.

An elevator weighing 15000 newtons s raised in 50 seconds. If the distance between stories is 3.0 meters how much power is required of the motor?

starla is making hot cocoa. She plans to multiply the recipe by 4 to make enough hot cocoa for the whole class l.

What evidence can you present for the possibility of time travel?

A ball is being rolled by a normal push of 1000N. it is opposed by friction which has a force of 0.3kN and air resistance which has a force of 23N. Calculate the resultant force.

What was the change in internal energy (chemical energy plus thermal energy) of the person pulling the block?

One of the longer sides of a kite is 39 feet. one of the shorter sides is 25 feet. half the length of the shorter diagonal is 15 feet. what is the area of the kite?

As the width of an opening in a barrier increases, how will the amount of diffraction of the planar waves change as they pass through the opening? A. It will increase. B. It will decrease. C. It will remain the same.