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Questions in physics

[Done] When a speeding truck hits a stationary car, the car is deformed, and heat is generated. What can you say about the kinetic energy of the system after the collision?

[Done] Form a hypothesis about how deeply water could erode and how deeply glaciers could erode.

[Done] How do you find an object's mass on an acceleration vs. force graph?

[Done] Will xenon react with nitrogen, and why?

[Done] Imagine two artificial satellites orbiting Earth at the same distance. One satellite has a greater mass than the other one. Which of the following would be true about their motion? 1. The satellite with the greater mass is being pulled toward Earth with less of a force than the other satellite. 2. The satellite with the greater mass is being pulled toward Earth with greater force than the other satellite. 3. The two satellites are being pulled with an equal force by the moon. 4. The two satellites are being pulled toward Earth with equal force.

[Done] List two examples of ways to increase efficiency in a machine.

[Done] How much tension is there in a rope that holds a 20-N bag of apples at rest?

[Done] Calculate the maximum kinetic energy of photoelectrons emitted from a metal plate when light of wavelength [tex]\lambda = 520 \, \text{nm}[/tex] is directed at the metal surface. - Work function ([tex]\Phi[/tex]) of the plate = [tex]1.1 \times 10^{-19} \, \text{J}[/tex] - Planck's constant ([tex]h[/tex]) = [tex]6.63 \times 10^{-34} \, \text{Js}[/tex] - Frequency ([tex]f[/tex]) = [tex]\frac{c}{\lambda}[/tex] - Speed of light in a vacuum ([tex]c[/tex]) = [tex]3.00 \times 10^{8} \, \text{ms}^{-1}[/tex] - Maximum kinetic energy ([tex]E_{k\text{max}}[/tex]) = [tex]hf - \Phi[/tex] Note: The wavelength must be converted to meters: [tex]\lambda = 520 \times 10^{-9} \, \text{m}[/tex] Calculate the value to verify your results.

[Done] How do I find displacement on a position-time graph?

[Done] What three factors set convection currents in motion?