How are electromagnets different from regular magnets?

They can be turned on and off.

Their polarity can be reversed.

Their strength can be changed.

All of the above.

None of the above.

Near the end of a marathon race, the first two runners are separated by a distance of 41.6 m. The front runner has a velocity of 3.4 m/s, and the second a velocity of 4.85 m/s.

In September 2016 you purchased a 125 shares of Grainger stock for $224.84. It is now September 2019 and Grainger stock is currently priced at $295.56.

If you throw a baseball strait into the air with a speed of 35 m/s how high will it go

Hydroelectricity provides about 7 percent of the electricity generated in the united states. (a) explain how a hydroelectric power plant converts energy stored in water into electricity.

What will be the new volume when 128 mL of gas at 20.0°C is heated to 40.0°C while pressure remains unchanged? What will be the new volume when 128 mL of gas at 20.0°C is heated to 40.0°C while pressure remains unchanged? 64.0 mL 256 mL 120.

Which features involve compression? Select the three correct answers. A. Reverse faults B. Anticlines C. Folded mountains D. Normal faults E. Monoclines

You place a cup of 210 degrees F coffee on a table in a room that is 68 degrees F, and 10 minutes later, it is 200 degrees F. Approximately how long will it be before the coffee is 180 degrees F? Use Newton's law of cooling:

What change occurs to the mass of an object when an unbalanced force is applied to it? A. The mass increases. B. The mass decreases. C. The mass remains the same. D. The mass reduces to zero. E. The mass changes by an indeterminate amount.

The equilibrium price will rise, but equilibrium quantity may increase, decrease, or stay the same if a. demand increases and supply decreases. b. demand increases and supply increases. c. demand decreases and supply increases. d.

The nearest large galaxy to our own is about 2.5 million light-years away. how many meters is that