Which of the following is a chemical change?

a. Freezing water

b. Melting ice

c. Bending a wire

d. Burning paper

What is the relationship between intensity of the energy radiated by the blackbody and the temperature in degrees Kelvin?

What would happen if you took a really strong metal box and you started teleporting in hundreds and hundreds of small cotton balls until there is no space left and when you are 100% sure there is no more space left u teleport in a small metal ball.

A 20-kg object is subjected to three forces which produce an acceleration a = - 8 m. s^-2 i + 6.0 m. s^-2 j on the object. Two of the forces are:F1 = 3.0 N i + 16.0 N jF2 = - 12.0 N i + 8.0 N jFind the third force.

Wind turbine B has blades twice as long as wind turbine A. If they are subjected to the same wind, what is the relationship between the power from turbine A (PA) and the power from turbine B (PB) ?

Kim holds a pinwheel in the air and says it can be used to model a source of energy. Identify the type of energy Kim's pinwheel models. Explain the type of energy source used.

How would life on earth be different if earth's axis were not tilted with respect to its orbit? A. There would be no seasons. B. There would be no day and night. C. All places would have the same climate. D. The seasons would be much shorter.

What will a spring scale read for the weight of a 75.0-kg woman in an elevator that moves upward with constant speed of 5.8 m/s?

What's the definition of: • cellular respiration • photosynthesis

What are the steps that are important to take for your safety during an earthquake? a. stay away from walls and windows c. stay away from electrical and gas lines b. get under a desk or table d. all of the above

You have an open air column of length 1.40 m in air at 24.2 °C. What is the frequency of the third harmonic?