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olchik [2.2K]
4 years ago
12

An elevator held by a single cable is ascending but slowing down. Is the work done by tension positive, negative, or zero? What

about the work done by gravity? Explain
Physics
1 answer:
inessss [21]4 years ago
8 0

Explanation:

1.) Work = Force*Distance

2.) The direction of motion lies in the same direction as the tension in the cable. So the work done by tension would be positive.

3.) The direction of the weight (due to gravity) would act opposite to the direction of motion of the elevator, so work done by gravity becomes negative.

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Why electric field inside the conductor zerqual to zero
Arlecino [84]
In electrostatics free charges in a good conductor<span> reside only on the surface.

</span>
5 0
3 years ago
A 0.775-m3 rigid tank initially contains air whose density is 1.18 kg/m3. The tank is connected to a high-pressure supply line t
Rama09 [41]

Answer:

2.9 kg

Explanation:

Given that a 0.775-m3 rigid tank initially contains air whose density is 1.18 kg/m3.

According to the definition of density

Density = mass/volume

1.18 = mass / 0.775

Mass = 1.18 × 0.775

Mass = 0.9145 kg

Given that the tank is connected to a high-pressure supply line through a valve. The valve is opened, and air is allowed to enter the tank until the density in the tank rises to 4.95 kg/m3.

Using the same density formula

Density = mass/volume

4.95 = mass / 0.775

mass = 3.83625 kg

To determine the mass of air that has entered the tank, take away the mass of the air initial in the tank from the mass calculated

Mass = 3.83625 - 0.9145

Mass = 2.923kg

Therefore, the mass of air that has entered the tank is 2.9 kg approximately.

3 0
3 years ago
What would happen if there was no condensation stage in the water cycle?
slavikrds [6]
Without condensation, the water vapor could not turn into clouds and liquids then which means it could not fall back down through things like rain or hail. Eventually, all water on earth would then become water vapor and we wouldn't have any water in liquid form.
3 0
3 years ago
Tina and her puppy are tugging on a rope, each pulling on opposite ends.
anyanavicka [17]
Work is done when the ‘object moves in the same direction as the force’ an example being a man walking up a flight of stairs carrying a box of weight.

Work is not done when the direction of the applied force and the direction in which the object moves are PERPENDICULAR to each other. An example being A man carrying a load while walking, no work is done on the load in the upward direction as the load is only moving horizontally.

Thus the answer is whenever she pulls the puppy towards her

3 0
3 years ago
When a ray of light passes through a boundary between two transparent media, it changes direction. What is this phenomenon known
algol [13]

Answer:

The phenomenon is known as refraction. The correct option is B

Explanation:

Refraction is defined as the property of a change in the direction of light, when it passed from one medium to another. In the process of refraction, the direction to which the rsy of light follows changes as well as the velocity, but the frequency remains the same along the line of propagation.

The extent of propagation is determined by the nature of the medium allowing the propagation.If a ray of light hits the surface of a sheet of glass, some light will be reflected by the surface of the glass. However, much of the light will pass through the glass, because glass is transparent. This effect also o view with mediums such as water.

The reason why the light rays bends away from its normal direction is that light slows down when it passes from the less dense air into the denser glass or water.

Other properties of light includes:

--> light travels in a straight line

--> light can be reflected

--> light can be diffracted

--> light can be polarized

7 0
3 years ago
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