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Questions in physics

[Done] When you hit a nail into a board using a hammer, the head of the nail gets warm. In terms of kinetic and thermal energy, describe why you think this happens.

[Done] A stack of 55 business cards is 1.85 cm tall. Use this information to determine the thickness of one business card.

[Done] The planet Pluto has \(\frac{1}{500}\) the mass and \(\frac{1}{15}\) the radius of Earth. What is the value of \(g\) on the surface of Pluto? A. 0.3 m/s\(^2\) B. 1.6 m/s\(^2\) C. 2.4 m/s\(^2\) D. 4.5 m/s\(^2\) E. 7.1 m/s\(^2\)

[Done] What is a group of individuals of the same species living in the same geographic area called?

[Done] A fan uses 7 A when connected to a 110 V line. If electric power costs 10 cents per kilowatt-hour, what is the cost of running the fan for 13 hours?

[Done] The way the brain perceives the intensity of a sound is:

[Done] You drop your backpack out of a window from a height of 8.3 m. What is the impact speed of your backpack? A. 163 m/s B. 1.2 m/s C. 21.3 m/s D. 12.8 m/s

[Done] What is an example of a high amplitude sound, and an example of a low amplitude sound?

[Done] A 4-kilogram ball moving at 8 m/s to the right collides with a 1-kilogram ball at rest. After the collision, the 4-kilogram ball moves at 4.8 m/s to the right. What is the velocity of the 1-kilogram ball?

[Done] How do biotic and abiotic conditions change during secondary succession?