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Questions in physics

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

[Done] A vector quantity c) always zero 65. The balls of iron and aluminium of same diameter are dipped in water. Which is the correct state? a) The upthrust on the iron ball will be more than the aluminium ball. b) The upthrust on aluminium ball is more than the iron ball. c) The upthrust on both balls will be the same. d) None of the above

[Done] In practice, photovoltaic systems suffer numerous losses that reduce the actual electricity produced by potential power output. A. no more than 5% B. approximately 15% C. as much as 20% or more D. no less than 50%

[Done] What is the wavelength of a photon with an energy of 3.38 $x 10^{-19} J$? A. 588 nm B. 510 nm C. 460 nm D. 416 nm

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

[Done] What is the wavelength of light with a frequency of [tex]$7.21 \times 10^{14}$[/tex] Hz? A. 628 nm B. 721 nm C. 237 nm D. 416 nm

[Done] How much heat is required to raise the temperature of 1 kg of water from 20°C to 70°C? (Specific heat 4200 J/kg°C) A. 210,000 J B. 252,000 J C. 180,000 J D. 50,000 J

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

[Done] Sound Wave A is moving through a medium that is decreasing in temperature. Sound Wave B is moving from a liquid to a gas medium. Which statement can be made about both waves? A. They will speed up. B. They will increase the density of their medium. C. They will slow down. D. They will decrease the density of their medium.

[Done] Enter the following expression in the answer box below: $\sqrt{\frac{2 g \lambda^3}{m}}$, where $\lambda$ is the lowercase Greek letter lambda.