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Questions in physics

📝 Answered - 1. Fill in the blanks. a. Any quantity that can be measured is called a ________ quantity. b. Physical quantities which do not depend on each other are called ________ quantity. c. Volume is an example of ________ physical quantity. d. ________ is finding out the exact value of an unknown quantity by comparing it with a fixed known quantity of the same kind. e. Millimetre is a ________ of metre.

📝 Answered - 12. The fifth state of matter is: 1) Solid 2) Gas 3) Plasma 4) Plasma 13. Bose Einstein Condensate was first produced by: 1) Eric Cornell 2) Carl Wieman 3) Lise Meitner 4) Both 1 and 2 14. The process by which a solid changes to liquid by absorbing heat, is called: 1) Boiling 2) Vapourisation 3) Melting 4) Heating

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

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

📝 Answered - Find the applied voltage when the current is 30 A and the resistance is [tex]$4 \Omega$[/tex]. Select one: A. [tex]$30 \Omega$[/tex] B. [tex]$60 \Omega$[/tex] C. [tex]$120 \Omega$[/tex] D. [tex]$180 \Omega$[/tex]

📝 Answered - Janet installed a dimmer on the lights in her bedroom. She slid the dimmer switch up, causing the resistance in the circuit to decrease. Assuming the voltage is constant, what will Janet's actions have on the circuit? Select all the correct answers. A. The voltage will increase from 120 to 240 volts. B. The lights will brighten. C. The current will decrease. D. The current will increase. E. The lights will dim.

📝 Answered - Astronomers have divided the sky into 88 constellations. True or False

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

📝 Answered - Anya recorded the temperatures of four different smooth materials after they were placed under a heat lamp for thirty minutes. | Material | Temperature (°F) | | -------- | ------------------ | | W | 87 | | X | 99 | | Y | 75 | | Z | 105 | Which conclusion is best supported by the information in the chart? A. Material W is less absorbent than material Z. B. Material $Y$ is the least reflective. C. Material $X$ is more reflective than material $W$. D. Material Z is the least absorbent.

📝 Answered - Sound intensity model: [tex]L=10 \log \left(\frac{I}{I_0}\right)[/tex] [tex]L =[/tex] loudness, in decibels [tex]( dB ) ; I =[/tex] sound intensity, in watts [tex]/ m ^2 ; I_0=10^{-12}[/tex] watts [tex]/ m ^2[/tex] The loudness of a jack hammer is 96 dB. Its sound intensity is about ____ The loudness of a compactor is 94 dB. Its sound intensity is about ____ The sound intensity of the jack hammer is about ____ times the sound intensity of the compactor. The loudness of a pile driver is 112 dB. About how many times the sound intensity of the jackhammer is the sound intensity of a pile driver? Round to the nearest ten. ____