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3 years ago

What real-world examples show no work being done? Can you think of examples other than resisting the force of gravity?

Physics

1 answer:

GalinKa [24]3 years ago

8 0

-- pushing on a brick wall

-- standing on your little brother's back so that he can't get up

-- taking a nap while on the job

-- squeezing anything that doesn't yield to your squeeze, such as a glass bottle or your girl friend

-- watching TV

-- solving math problems in your head

-- making pictures out of clouds in the sky

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A proton moves in a circular path perpendicular to a constant magnetic field. If the field strength of the magnet is increased,

zheka24 [161]

Answer:

The diameter of the circular path decrease

Explanation:

The magnitude of the magnetic force exerted on the proton is given by:

$F=qvB$

According to Newton's second law, this force is equal to the centripetal force. Therefore, we have:

$F=F_c\\qvB=ma_c$

Recall that $a_c=\frac{v^2}{r}$ . Replacing and solving for B:

$qvB=m\frac{v^2}{r}\\B=\frac{mv}{qr}$

Thus, the field stregth is inversely proportional to the radius of the path and since the radius is directly proportional to the diameter, if the field strength increases, the diameter decreases.

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3 years ago

Which of the following is the name of the process scientists use to gain

harkovskaia [24]

Answer:

Explanation:

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3 years ago

A(n) __________ refers to a substance or treatment that is often used in an experiment but does not have an actual medicinal or

sweet [91]

Answer:

placebo

Explanation:

3 0

1 year ago

Read 2 more answers

When is the kinetic energy of the ball zero and when is it at its highest? When is its potential energy at its lowest and at its

liubo4ka [24]

Answer:

if there is only one planet in the universe and the ball is there it will have 0 kinetic energy if the ball is in the very center of that planet only if the planet itself is absolutely motionless. its at its highest if the planet is moving away from the ball at a slightly faster speed forever. Between point A and B both potential energy and kinetic energy are at perfect 0.

Explanation:

never will have a measurable kinetic or potential energy status unless every single object is included in the calculation.

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3 years ago

A gas expands and does PV work on its surroundings equal to 319 J. At the same time, it absorbs 136 J of heat from the surroundi

LiRa [457]

Answer:

The change in energy of the gas during the process is $-1.83\times 10^{2}$ joules.

Explanation:

We can represent this process by the First Law of Thermodynamics, in which gas does work on its surroundings and absorbs heat from there to describe its change in energy. In other words:

$Q_{in} - W_{out} = \Delta E$