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Questions in physics

[Done] An air mass entering Alaska from the northern Pacific Ocean would most likely be labeled on a weather map as: (1) cP (2) cT (3) mP (4) mT

[Done] State the law of universal gravitation, and use examples to explain how changes in mass and changes in distance affect gravitational force.

[Done] While in Canada, the engineer buys a new electric toothbrush. When she returns home, she designs another transformer so she can use the toothbrush in India. This transformer also has an input coil with 240 turns. How many turns should the output coil have?

[Done] Water that flows downhill along Earth's surface is called:

[Done] What is capacitance?

[Done] A machine does 1,500 joules of work in 30 seconds. What is the power of this machine?

[Done] The resistance of moving surfaces produces ________. Friction always results in a loss of ______ in the form of _____, which enters the atmosphere. Friction can sometimes be the result of the attraction of different substances which are in contact with one another. True or false? Oil or water clinging to the surface of a jar is an example of ______________.

[Done] Which has a greater buoyant force: light corn syrup or vegetable oil?

[Done] Explain why cool rock material sinks when convection takes place in the mantle.

[Done] A railroad car with a mass of [tex]1.94 \times 10^4 \, \text{kg}[/tex] moving at [tex]3.28 \, \text{m/s}[/tex] joins with two railroad cars already joined together, each with the same mass as the single car and initially moving in the same direction at [tex]1.02 \, \text{m/s}[/tex]. What is the velocity after the collision and the total kinetic energy lost?