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Questions in physics

[Homework Help] An infrared wave traveling through a vacuum has a frequency of $4.0 \times 10^{14} Hz$. What is the wave's wavelength? A. $7.5 \times 10^7 m$ B. $7.5 \times 10^{-7} m$ C. $1.2 \times 10^{14} m$ D. $1.2 \times 10^{-14} m

[Homework Help] The potential energy, [tex]P[/tex], in a spring is represented using the formula [tex]P=\frac{1}{2} k x^2[/tex]. Lupe uses an equivalent equation, which is solved for [tex]k[/tex], to determine the answers to her homework. Which equation should she use? [tex]k=2 P x^2[/tex] [tex]k=\frac{1}{2} P x^2[/tex] [tex]k=\frac{2 P}{x^2}[/tex] [tex]k=\frac{p}{2 x^2}[/tex]

[Homework Help] Any external force that acts against movement is called A. gravity B. efficiency C. resistance D. momentum

[Homework Help] Any external force that acts against movement is called: A. gravity B. efficiency C. resistance D. momentum

[Homework Help] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Homework Help] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Homework Help] What do you mean by a series combination of cells? Two cells of different emfs and internal resistances are connected in series and parallel. Find expressions for the equivalent emf and equivalent internal resistance of the combination.

[Homework Help] What is the energy of light with a frequency of [tex]$3 \times 10^9 Hz$[/tex]? [tex]\begin{array}{c} h=6.626 \times 10^{-34} J \cdot s \\{[?] \times 10^{[?]} J}\end{array}[/tex]

[Homework Help] Select the correct answer. A force of 15 newtons is applied to both Object A with a mass of 25 kilograms and Object B with a mass of 50 kilograms. What is true about the acceleration of Object A and Object B? A. Acceleration of Object A is four times that of the acceleration of Object B. B. Acceleration of Object A is the same as the acceleration of Object B. C. Acceleration of Object A is half the acceleration of Object B. D. Acceleration of Object A is twice that of the acceleration of Object B

[Homework Help] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?