How do you know there was a chemical reaction? Check all indicators below. A solid precipitate formed. The color changed. A gas was produced. The reaction absorbed or released heat.

Michael Faraday was one of the first scientists to experiment with motors. How did Faraday design his first motor?

Why is chlorinated swimming pool water a homogeneous mixture?

The race officials want to set up portable bleachers near the finish line. Each set of bleachers is 4.50 meters long and 2.85 meters wide. How many square meters of open ground space do they need for each set?

What is the distance covered when the speed is 960km/hr and time is 1 hour and 50 minutes?

When using a film camera, what must you do to bring an object into focus? a. move the lens toward or away from the film. b. close the diaphragm. c. adjust the speed of the shutter. d. adjust the angle of the mirror.

Two water manometers are connected to a tank of air. One leg of the manometer is open to 100kPa pressure (absolute) while the other leg is subjected to 90kPa. Find the difference in deflection between both manometers, Delta h_a - Delta h_b.

Most geologists believe that the dinosaurs became extinct 65 million years ago when a large comet or asteroid struck the earth, throwing up so much dust that the sun was blocked out for a period of many months. A.

If you drop a silver dollar off a building and it hits the ground in 10 seconds, how fast was the coin going just before it hit?

What is the weight of an with a mass of 32kg

The index of refraction of silicate flint glass for red light is 1.620 and for violet light is 1.660. A beam of white light in this glass strikes the glass-air interface at a 25.50∘ angle of incidence and refracts out into the air.