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Questions in physics

[Answered] Which of the following colors has the highest frequency? A. Blue B. Yellow C. Red D. Green

[Answered] Which process happens in the star? a) Electron excitation b) Nuclear fusion c) Nuclear fission d) Diffusion

[Answered] The average deviation of a set of measurements allows one to assess the a) error involved in the measurements b) accuracy of the measurement c) closeness of each measurement to the actual value d) precision of the measurements e) probability of the measurements being wrong

[Answered] What are the three A’s of time management?

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

[Answered] Particles with which electric charges will attract one another? a) positive and positive b) positive and negative c) negative and negative d) both positive and positive and positive and negative

[Answered] How much energy does a [tex]$9 x 10^{-8} m$[/tex] wavelength photon have? A. [tex]$5.96 x 10^{-41} J$[/tex] B. [tex]$2.21 x 10^{-18} J$[/tex] C. [tex]$1.988 x 10^{-49} J$[/tex] D. [tex]$7.36 x 10^{-27} J$[/tex]

[Answered] A 0.2 kg block of ice at 0°C is dropped carefully into a styrofoam calorimeter cup with an unknown mass of water at 20°C. When thermal equilibrium is reached, the final temperature is measured to be 5°C. What was the mass of water initially in the cup? (Specific latent heat of fusion of ice = 334000 J/kg, specific heat capacity of water = 4200 J/kg K)

[Answered] A particle is moving along the [tex]$x$[/tex] axis such that its position is given by [tex]$x=4 t^2-16 t+12$[/tex]. i. Find the instantaneous velocity when [tex]$t=5 s$[/tex]. ii. Find the instantaneous acceleration when [tex]$t =5 s$[/tex]. iii. At what time is the particle stationary?

[Answered] Dewayne reviews Kepler's laws by making the table shown. | Kepler's Law | Description | |---|---| | W | The orbital period is related to the average distance from the Sun. | | X | Orbits are ellipses with the Sun at a focus. | | Y | A planet sweeps out equal areas in equal time frames as it orbits the Sun. | Which label belongs in each cell of the table? W: First X : Second Y: Third W: Third X : Second Y: First W: Third