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Questions in physics

[Homework Help] What causes the Earth's crust to move?

[Homework Help] The frequency of violet light is [tex]7.5 \times 10^{14}[/tex] hertz. What is the wavelength?

[Homework Help] Which is an example of a physical change? A. Metal rusting B. Silver tarnishing C. Water boiling D. Paper burning

[Homework Help] You hear thunder 3 seconds after you see lightning. How far away is the storm?

[Homework Help] How much work does a person do in pushing a box with a force of 10 N over a distance of 4.0 m in the direction of the force?

[Homework Help] The density of ice is 0.92 g/cm\(^3\). An ice sculptor orders a one cubic meter block of ice. What is the mass of the block? Hint: 1 m\(^3\) = 1,000,000 cm\(^3\) Give your answer in grams and kilograms.

[Homework Help] A particle is moving along the x-axis so that its position at any time [tex]t \geq 0[/tex] is given by [tex]x(t) = 2te^{-t}[/tex]. A) Find [tex]v(t)[/tex]. B) Find [tex]a(t)[/tex]. C) At [tex]t = 0[/tex], is the particle slowing down or speeding up? Explain. D) At what time(s), if any, does the particle change directions? Justify your answer.

[Homework Help] A merry-go-round makes 18 rotations in 3 minutes. What is its angular speed in rotations per minute (rpm)?

[Homework Help] You are given two solid materials, one that is organic and one that is not organic. Describe three tests you could perform to help you decide which is which.

[Homework Help] A marble rolling at a speed of 2 meters per second falls off the end of a 1-meter high table. How long will the marble be in the air? a. What do you know? b. What do you need to solve for? c. What equation(s) will you use? d. What is the solution to this problem?