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Naya [18.7K]
3 years ago
6

On Earth, friction can be _____ but not removed.

Physics
1 answer:
Whitepunk [10]3 years ago
4 0

Answer:

reduced

Explanation:

The use of bearing surfaces that are themselves sacrificial, such as low shear materials, of which lead/copper journal bearings are an example

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a/ Compute the quantity of heat released by 25.0 g of steam initially at 100.0oC, when it is cooled to 34.0°C and by 25.0 g of w
Svetach [21]

Answer:

When put into steam

Explanation:

When a certain amount of steam at boiling temperature condenses (turning into water), the amount of heat released is

Q_1 = m\lambda_v

where in this case

m = 25.0 g = 0.025 kg is the mass of steam at 100.0°C

\lambda_v=2.256\cdot 10^6 J/kg is the latent heat of vaporization of water

So,

Q_1=(0.025)(2.256\cdot 10^6)=56400 J

Instead, the amount of heat released when the water at 100.0°C is cooled down to 34.0°C is given by

Q_2=mC\Delta T

where

m = 25.0 g = 0.025 kg is the mass of water

C=4.19\cdot 10^4 J/kg K is the specific heat of water

\Delta T=100-34=66^{\circ}C is the change in temperature

Therefore,

Q_2=(0.025)(4.19\cdot 10^3)(66)=6913 J

Since Q_1>Q_2, we can say that your hand will burn more in the first case.

5 0
3 years ago
An engine performs 2700 J of work on a scooter. The scooter and rider have a combined mass of 150 kg. If the scooter started at
Finger [1]
Due to the principle of conservation of energy, the work done by the engine to move the scooter converts into kinetic energy of the scooter:
W=K= \frac{1}{2} M v^2
where M is the combined mass of scooter and rider, and v is the velocity of the scooter. Therefore, we can find the velocity as:
v=  \sqrt{ \frac{2W}{M} } =  \sqrt{ \frac{2\cdot 2700 J}{150 Kg} }=6 m/s
6 0
4 years ago
Which statement descThe image shows the right-hand rule being used for a current-carrying wire.
Makovka662 [10]
Answer:

The second option.
When the current flows up the wire, the magnetic field flows out on the left side of the wire and in on the right side of the wire.

Explanation:

The first figure that I copy here with is the figure corresponding to this question.

The thumb is pointing upward.

The rule is that the thumb aims to the direction of the flow of current and the other fingers give the field lines.

The second figure that I attach is a free image from internet and it shows the direction of both the current and the fiedl lines.

So, the conclusion is that the current goes upward the wire and the field lines go out of the paper (screen) for the points to the left of the wire and in on the right side of the wire.

4 0
4 years ago
Read 2 more answers
What happens when a colder drier air mass pushes against a warmer moister air mass
andrew-mc [135]
A cold<span> front </span>occurs when a cold air mass advances into a region occupied by a warm air mass<span>. If the boundary between the </span>cold<span> and </span>warm air masses<span> doesn't move, it is called a stationary front. This is due to the (usually) higher humidity in the </span>air<span> of </span>warm<span> fronts compared to that of </span>cold<span> fronts.

Hope this helps</span>
6 0
4 years ago
What happens to the wavelength of a wave when the frequency of the wave is doubled but the wave speed stays the same?
slava [35]
Speed= freq x wavelength
if freq is doubled the wavelength will halve for constant speed
5 0
3 years ago
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