Why do elements need to be heated to emit color?

A car travels at uniform acceleration over a distance of 440.0 m. Its final velocity after 20.0 s is 33.0 m/s. What is its initial velocity?

Suppose a cart is being moved by a force. If suddenly a load is dumped into the cart so that the carts mass doubles, what happens to the carts acceleration?

Which of the following is a unit of speed? A) h B) nm C) cm/y D) km/s^2

A 1.90-m-long barbell has a 25.0 kg weight on its left end and a 37.0 kg weight on its right end. if you ignore the weight of the bar itself, how far from the left end of the barbell is the center of gravity?

Into what three areas are the natural sciences commonly divided

What is 1.33Ω plus 2Ω?

As a fire truck approached Mary, the pitch of the siren got higher. once the fire truck passed and moved away, the sirens pitch got lower. this change in pitch is because in the sound waves

Find the magnitude of the sum of these two vectors

Light waves that cross from an air medium to a water medium will A. O be focused into a straight line. B. O lose energy and dissipate. C. O change length and direction. D. O reflect off the water's surface.

What is a possible cost of using nonrenewable energy resources? A. Costs more money B. Less water pollution C. Sustainable energy D. Greenhouse gases