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2 years ago

14

Why caring a body and moving with it is not a work done Why :

1 answer:

Alecsey [184]2 years ago

8 0

Answer:

Work done on an object is equal to

FDcos(angle).

So, naturally, if you lift a book from the floor on top of the table you do work on it since you are applying a force through a distance.

However, I often see the example of carrying a book through a horizontal distance is not work. The reasoning given is this: The force you apply is in the vertical distance, countering gravity and thus not in the direction of motion.

But surely you must be applying a force (and thus work) in the horizontal direction as the book would stop due to air friction if not for your fingers?

Is applying a force through a distance only work if causes an acceleration? That wouldn't make sense in my mind. If you are dragging a sled through snow, you are still doing work on it, since the force is in the direction of motion. This goes even if velocity is constant due to friction.

Explanation:

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Find the Input force, if the Mechanical Advantage of the simple machine used is 5 and Output force is 50 N.

galina1969 [7]

Answer:

6N

Explanation:

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3 years ago

Chemical energy is the stored form of chemical bonds containing combinations of which elements? Select THREE (3) elements. *

riadik2000 [5.3K]

Carbon hydrogen oxygen

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3 years ago

How much heat is given off when 210.0g of water at 0 degrees freezes into ice?

Sergio [31]

In the freezing physical change, when 210.0 g of water a 0 degrees freezes into ice, it gives off 71.0 kJ of heat.

<h3>What is freezing?</h3>

It is a physical change in which liquids give off heat to form solids.

We have 210.0 g of water at 0°C. We can calculate the amount of heat given off when it freezes into ice using the following expression.

Q = ΔH°fus × m

Q = 0.334 kJ/g × 210.0 g = 70.1 kJ

where,

Q is the heat released.
ΔH°fus is the latent heat of fusion.
m is the mass.

In the freezing physical change, when 210.0 g of water a 0 degrees freezes into ice, it gives off 71.0 kJ of heat.

Learn more about freezing here: brainly.com/question/40140

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2 years ago

V = d/t please help with my physics question!

Assoli18 [71]

Answer:

313, 0.60 s

Explanation:

wavelength

= speed/frequency

= 340/520

= 0.6538 m

Number of wavelengths

= 205/0.6538

= <u>313</u> (whole number)

Time delay

= distance/speed

= 204/340

= <u>0.60 s</u>

7 0

3 years ago

. A non-uniform positive line charge of length 2 m is put along the x-axis as shown in the figure, where x0=1.5 m. The linear

PilotLPTM [1.2K]

Answer:

$E = 7.2*10^{10}N/C$

Explanation:

The differential electric field $dE$ due to differential charge $dQ$ at distance $x$ from the origin is

$dE = k\dfrac{dQ}{x^2}$

but since $dQ = \lambda dx = 4x^2dx$ we have

$dE = k\dfrac{4x^2dx}{x^2}$

$dE = 4k\: dx$

integrating this from $x_0$ to $x_0+L$ we get

$E = \int^{x_0+L}_{x_0} {4k} \, dx$

$E = 4k[(x_0+L)-x_0]$

$E =4kL$

putting in $k = 9*10^9Nm^2/C^2$ and $L =2m$ we get

$\boxed{E = 7.2*10^{10}N/C.}$

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3 years ago