You walk into an elevator, step onto a scale, and push the "up" button. you recall that your normal weight is 639 n. when the elevator has an upward acceleration of magnitude 2.90 m/s2, what does the scale read?

2. As the density of the medium increases, the speed of light A, increases B. decreases C. remains the same

Which of the following would increase friction? A. Water B. Motor oil C. Sand D. Soap

An object's acceleration is never A. directly proportional to the net force. B. inversely proportional to the object's mass C. in the same direction as the net force. D. in the opposite direction as the net force.

Describe uniform velocity and variable velocity in short

A spring has a spring constant of 30000 N/m. How far must it be stretched (in meters) for its potential energy to be 47 J?

A thermometer measures its own temperature? What does it mean?

How do you find momentum

A 60-W light bulb and a 100-W light bulb are both rated at 120 V. Which light bulb has the larger resistance? the 60-W bulb

What is the innermost layer of the sun's atmosphere called?

Suppose 3 neutrons are released by an atom of U-235 in the first stage of a fission chain reaction. Each of these neutrons has enough energy to cause another fission reaction in another nucleus of U-235, releasing more neutrons.