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3 years ago

1. Water boils at 100°C at sea level. If the water in this experiment did not boil at 100°C, what could be the reason?

Physics

2 answers:

umka2103 [35]3 years ago

8 0

Answer:

It may not be at the sea level

Explanation:

The reason here is water only boils at sea level. This means that if you move water to a different height, say top of a mountain, the boiling temperature of water would change. This is due to the pressure drop at high place. The drop of pressure would make it harder to transform water liquid to gas, thus requiring more temperature.

yulyashka [42]3 years ago

8 0

Answer:

The experiment is not performed at sea level.

And also there may be presence of impurities in the water used for the experiment

Explanation:

The boiling point of pure water at sea level is 100°C, but the boiling point can be affected mainly by two factors;

i) Pressure

ii) impurities

At higher altitudes ( above sea level) the atmospheric pressure is reduced (the higher you go the lower the atmospheric pressure), thereby leading to reduced boiling point of water (at lower pressure water boils faster). While if the altitude is lower than sea level atmospheric pressure is higher so water boils at higher temperatures (above 100°C).

Secondly, presence of impurities(e.g salt) in water increases the boiling point of water in most cases.

Therefore, if water does not boil at 100°C it may be as a result of the elevation (altitude) or the water may contain impurities.

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An object of mass m is traveling around a circle of radius v. What happens to the centripetal force if the radius is cut in half

german

Answer:

Centripetal force doubles

Explanation:

Since centripetal force is given by

$F=\frac {mv^{2}}{r}$

Where F is the centripetal force, m is the mass, v is the centripetal velocity and r is circle radius.

When the radius is reduced to half then the centripetal force will be

$F=\frac {mv^{2}}{0.5r}=\frac {2mv^{2}}{r}$

Evidently, the centripetal force is doubled compared to the initial.

Note that while the question gives letter v for radius, I used v for velocity and r for radius since these are the standard letters for abbreviating formula of centripetal force.

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3 years ago

If a spring stores 5 j of energy when its compressed by 0.5 m. what is the spring constant

aliya0001 [1]

The elastic potential energy stored in a spring is given by:

$E=\frac{1}{2}kx^2$

where k is the spring constant, and x=0.5 is the compression of the spring. Re-arranging the formula and using E=5 J, we find the spring constant:

$k=\frac{2E}{x^2}=\frac{2(5 J)}{(0.5 m)^2}=40 N/m$

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3 years ago

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The business practice of hiring workers in another country is known as globalization. insourcing. subcontracting. outsourcing.

tatiyna

outsourcing.

Explanation:

The business practice of hiring workers in another country is known as outsourcing.

Outsourcing involves the art of looking for cheap labors outside the shores of a country.

Since the same work can be done with a lesser cost, companies can decide to look beyond their boundaries.
Outsourcing is thriving in the aspect of remote works in the technological sector.
Some companies can decide to manufacture their goods outside of their base to due availability of cheap labor elsewhere.

Learn more:

Outsourcing brainly.com/question/5274596

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3 years ago

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Two trucks with equal mass are attracted to each other with a gravitational force of 5.3 x 10 -4 N. The trucks are separated by

HACTEHA [7]

Answer:

7327 kg or 7.3 tons

Explanation:

We have Newton formula for attraction force between 2 objects with mass and a distance between them:

$F_G = G\frac{M_1M_2}{R^2}$

where $G =6.67408*10^{-11} m^3/kgs^2$ is the gravitational constant on Earth. $M = M_1 = M_2$ is the masses of the 2 objects. and R = 2.6m is the distance between them.