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Questions in physics

[Answered] State whether the following statements are true or false. 1. On the solstices, the sun's rays are perpendicular to the equator, and someone residing on the equator would see the midday sun directly overhead. A. True B. False 2. Photovoltaic systems suffer numerous losses that reduce the actual electricity produced. A. True B. False 3. All photovoltaic cells made of silicon produce a voltage of about 0.5 volts per cell regardless of cell size. A. True B. False

[Answered] Draw a vacuum flask and label it fully. State the functions of the following parts of the flask: a) The cork cover b) The silvered surfaces c) The vacuum inside the double wall.

[Answered] What is required in order to determine whether or not an object moves? A. a reference point B. distance C. displacement D. standard units

[Answered] Describe how sonar works. Write your ideas in a sensible order using correct spelling and grammar. One mark will be given for writing in correct English.

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

[Answered] Which formula can be used to find velocity if kinetic energy and mass are known? [tex]v=\sqrt{\frac{1}{2}(K E)(m)}[/tex] [tex]v=\sqrt{\frac{2 m}{K E}}[/tex] [tex]v=\sqrt{K E(m)}[/tex] [tex]v=\sqrt{\frac{2 K E}{m}}[/tex]

[Answered] Which statement describes the relationship of voltage and current? A. Voltage is directly proportional to current because I = B. Voltage is inversely proportional to current because I = X- C. Voltage is directly proportional to current because I = VR. D. Voltage is inversely proportional to current because I = VR.

[Answered] When all the colors of light are mixed, what is the resulting color? A. blue B. red C. white D. black

[Answered] A particle is thrown horizontally from the top of a tower 80 m high with speed 10 m/s. How long does it take to hit the ground? (g = 10 m/s²) A. 4 s B. 2 s C. 8 s D. 16 s

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