Which of these is an indication that a chemical reaction has occurred?

1) melting of a substance

2) boiling of a substance

3) formation of a precipitate

4) freezing of a substance

What additional steps might be included in the eap for a wave pool, a winding river and the landing zone of a speed slide?

What is the speed of a transverse wave in a rope of length 2.00 m and mass 60.0 g under a tension of 500 n?

Which of these is a unit of measurement for volume? a. gram b. centimeterc. cubic centimeter d. square centimeter

Calculate the increase in potential energy of a 60.0-kg man who climbs a ladder 10.0 meters high

What can electromagnetic waves travel through?

A uniform, thin, solid door has height 2.20 m, width 0.870 m, and mass 23.0 kg. (a) find its moment of inertia for rotation on its hinges. (b) is any piece of data unnecessary

How does wavelength and frequency affect the speed?

A cyclist turns a corner with a radius of 37 m at a speed of 22 m/s. What's the cyclist acceleration? If the cyclist and cycle have a combined mass of 90 kg, what is the force causing them to turn?

A gas had a initial volume of 168 cm at a temperature of 255 k and a pressure of 1.6 atm the pressure of the gas decreased to 1.3 atm and the temperature of the gas increases to 285 k

A train travels 90 kilometers in 1 hours, and then 60 kilometers in 3 hours. What is its average speed