PHYSICS HIGH SCHOOL

Suppose that you hear a clap of thunder 16.2 s (seconds) after seeing the associated lightning stroke. The speed of sound waves in air is 343 m/s and the speed of light in air is 3.00*10^8 m/s. How far are you from the lightning stroke?

Answers

Answer 1
Answer: since the speed of sound is very high, we consider the time period of thunder and lightening negligible.

Now, d = vt

thus, d = 343 x 16.2

thus, d = 5556.6 metres

Thus, we are 5556.6 metres away from lightening ( approximately)

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Yellow light has a longer wavelength than green light. Which color of light has the higher frequency?

Answers

well wavelength=(speed of wave)/frequency
 so if wavelength is longer the frequency is shorter 
since yellow light has longer wavelength than green light
yellow light has a shorter frequency than green light
so green light has a higher frequency

A brass washer has an outside diameter of 4.50 cm with a hole of diameter 1.25 cm and is 1.50 mm thick. The density of brass is 8599 kg/m3. If you put this washer on a laboratory balance, what will it "weigh" in grams?

Answers

We will find the mass from 
mass = density x volume 
We are told the density and must find the volume from the dimensions given 
the volume of the washer will be the area x thickness (remembering to convert all measurements to meters) 
if the washer had no hole, its area would be pi (0.0225m)^2 (remember to convert to meters and to use radius) 
the area of the hole is pi(0.00625m)^2 
so the area of the washer is pi[(0.0225m)^2 - (0.00625m)^2] = 1.5x10^-3 m 
the volume of the washer is 1.5x10^-3 m x 1.5x10^-3 m = 2.25x10^-6 m^3 (the thickness of the washer is 1.5 mm = 1.5x10^-3m) 
thus, the mass of the washer = 8598kg/m^3 x 2.25x10^-6m^3 = 0.0189kg = 18.9 grams

When a wire is made smaller, the resistance increases. Which happens to the electric current?

Answers

Any time the resistance in a circuit increases, for any reason, the
current in the circuit decreases, unless the voltage is increased
to compensate for the greater resistance.

ICl has a higher boiling point than Br2. What is the best explanation for this?

Answers

Iodine Monochloride (ICI) is an interhalogen or compound. ICI has an intermolecular attraction which makes it more difficult to boil compare to Bromine (Br2). Brorime is among the halogens along with fluorine, chlorine, iodine and astatine. Bromine is a nonpolar substance while ICI is a polar compound.

The weight of a body floating in a liquid is​

Answers

Answer:

The apparent weight is the weight of the body minus the weight of the liquid displaced. The body will float only when both the weights are same. In this case, the given body of weight W is floating and hence the apparent weight is zero.

Answer:

Zero

Explanation:

The apparent weight is the weight of the body minus the weight of the liquid displaced. The body will float only when both the weights are same. In this case, the given body of weight W is floating and hence the apparent weight is zero.

Which alternative energy source would be expected to be the least dependent upon the weather?a. wind power
b. solar power
c. geothermal power
d. none of the above

Answers

Answer;

C. geothermal power

Explanation;

Geothermal power is considered to be a sustainable, renewable source of energy because the heat extraction is small compared with the Earth's heat content. It depends the least on weather.

Geothermal energy is the heat from the Earth. It's clean and sustainable. Resources of geothermal energy range from the shallow ground to hot water and hot rock found a few miles beneath the Earth's surface, and down even deeper to the extremely high temperatures of molten rock called magma.
Of the three sources listed, geothermal energy
is the least dependent on the weather.
(Once it's installed and running, that is.)
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