Explain why mercury is rarely used in modern thermometers

1 answer:

3 0

Answer: Mercury is rarely used in thermometers that take body temperatures because it is toxic, accidentally if by any chance a thermometer breaks orleaky, mercury gets inside body and can cause harm.

Explanation:

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Turning the barrel of a 50-mm-focal-length lens on a manual-focus camera moves the lens closer to or farther from the sensor to

Yuliya22 [10]

Answer:

Explanation:

To focus object at .7m , the image distance can be measured as follows

object distance u = .7m

focal length f = .05 m

image distance v = ?

from lens formula

$\frac{1}{v} -\frac{1}{u} = \frac{1}{f}$

$\frac{1}{v} +\frac{1}{.7} = \frac{1}{.05}$

$\frac{1}{v} =\frac{1}{.05} -\frac{1}{.7}$

v = .054 m

= 54 mm

when the object is at infinity , image is formed at focus ie at distance of

50 mm .

So lens position from sensor where image is formed , varies from 54 mm to 50 mm .

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3 years ago

Colton the Insulator of electricty.

maria [59]

Answer:

lemon juice , vinegar

Explanation:

Chemical Effects of Electric Current

Two substances other than water which conducts electricity are: (i) Lemon juice. (ii) Vinegar.

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3 years ago

A binary star system consists of two stars of masses m1 and m2. The stars, which gravitationally attract each other, revolve aro

mote1985 [20]

Answer: $a_{2}=\frac{m_{1}}{m_{2}} a_{1}$

Explanation:

The rest of the question is below:

Find a2, the magnitude of the centripetal acceleration of the star with mass m2.

Assuming both stars are describing a uniform circular motion, their acceleration vector is directed towards the center of mass of the system (that's why it's called centripetal acceleration).

Now, according to Newton's 2nd law, the force $F$ is directly proportional and in the same direction as the acceleration.