Which of the following quantities are unknown?

Physics

1 answer:

Novay_Z [31]4 years ago

6 0

Answer:

unknow e and f

Explanation:

In experiments with alpha particles that are obtained by the method of radioactive decay of atoms, some parameters are known

a) Known. The initial velocity is given by the energy of the particles entities by the atomic nuclei

b) Known. The particle charge always 2e, helium core

c) Known. It is set in the given experiment, in general it is selected as zero

d) Known. Placed by the experimenter

e) Unknown. The speed depends on the interactions with the system

f) Unknown. It depends on the interactions with the system, because the position depends on the interactions

g) Known. It is always the value of a helium nucleo

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2. A police car drives from a police station to a distance of 170 km in 4 hours. He then stops at a gas station for 1 hour to fi

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Answer:

a.42.5 km/h or .71 km/m

b. 66.7 km/h or 1.1repeating km/m

c.41.5 km/h or .69 km/m

Explanation:

These are all average speed problems, meaning you divide the distance traveled by the time $s=\frac{d}{t}$

A. 170km/4hrs or 170km/240 mins

B. 100km/1.5hrs or 100km/90mins

C. The only tricky thing here is the question seems like it wants the speed for all of the information given, so you do include the one hour that he stops

270km/6.5 hrs or 270km/390 mins

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4 years ago

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kvasek [131]

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3 years ago

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loris [4]

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A river with a flow rate of 7 m3/s discharges into a lake with a volume of 9,000,000 m3. The concentration of a particular VOC i

soldi70 [24.7K]

Answer:

The concentration downstream reduces to 0.03463mg/L

Explanation:

Initially let us calculate the time it is required to fill the lake, since for that period of time the pollutant shall remain in the lake before being flushed out.

Thus the detention period is calculated as

$t=\frac{V}{Q}\\\\t=\frac{9000000}{7}=1.285\times 10^{6}seconds\\\\\therefore t = 14.872days$