HRS - Ask. Learn. Share Knowledge. Logo

Questions in physics

[Done] The model of the universe that suggests the sun is the center of the universe was first proposed by: A. Brahe B. Kepler C. Ptolemy D. Copernicus Can someone also add a few facts about this suggestion and its author?

[Done] Suppose that you hear a clap of thunder 16.2 seconds after seeing the associated lightning stroke. The speed of sound waves in air is 343 m/s, and the speed of light in air is [tex]3.00 \times 10^8 \, \text{m/s}[/tex]. How far are you from the lightning stroke?

[Done] How do charges move through an insulated wire connected across a battery? Use the terms potential difference, current, conductor, and insulator in your answer.

[Done] How much kinetic energy does a 7.2-kg dog need to make a vertical jump of 1.2 m? The acceleration due to gravity is [tex]9.8 \, \text{m/s}^2[/tex].

[Done] What is the acceleration of a 0.30-kilogram ball that is hit with a force of 25 N?

[Done] If the standard kilogram bar kept in Paris were subjected to a net force of 1 newton, what acceleration would it have as a result?

[Done] Two strings of equal length are stretched out with equal tension. The second string is four times as massive as the first string. If a wave travels down the first string with velocity [tex]v[/tex], how fast does a wave travel down the second string?

[Done] How do matter and energy move through the water cycle?

[Done] The frequency of wave A is 250 hertz and the wavelength is 30 centimeters. The frequency of wave B is 260 hertz and the wavelength is 25 centimeters. Which is the faster wave?

[Done] Explain how the rabbit depends on energy from the sun.