HELP HURRY ASAP Question 2 of 10 Which two options describe physical properties of matter?
A. The amount of mass per unit volume
B. How easily a substance reacts with other substances
O c. Whether a substance is acidic or basic
D. Whether a substance forms a patina
E. The color of the light that is reflected off a substance's surface
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Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?

Agroup of students were investigating the force of gravity. they began by dropping a foam ball from a height of 3 meters into a bucket of sand. the ball hit the sand in 0.306 seconds. they dropped additional balls of approximately the same diameter, but of different masses. here is the data they collected. based on this experiment and the collected data, what would their conclusion be?

Explain why electric current cannot exist if a current doesn't have a voltage source.