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Questions in physics

[Answered] What is the S.I. unit of momentum?

[Answered] What does a mechanical advantage of less than one mean? What is gained?

[Answered] What instrument uses lenses or mirrors to collect and focus light from distant objects?

[Answered] What measures the radiation given off by Earth?

[Answered] Are there any cases in which the electrostatic force between two objects is zero according to Coulomb's Law?

[Answered] Why do we see the color black?

[Answered] The apparent change in frequency of a source of sound due to the relative motion between the source and a listener is called the Doppler effect.

[Answered] Which represents a type of electromagnetic wave? A. Slinky wave B. Jump rope wave C. Shortwave radio waves D. Ocean wave

[Answered] Is sand made of cells?

[Answered] What are the three types of acceleration?