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Vikentia [17]
3 years ago
5

A magnetic dipole

le" class="latex-formula"> placed in a magnetic field \vec{B} Explain why the potential U can be written as U=-\vec{m}\cdot\vec{B}.
Physics
1 answer:
ser-zykov [4K]3 years ago
7 0
We are asked to know the reason why magnetic dipole can be written as U = -m *B. The reason for this was that the negative sign is just showing or indicating the direction of the force. If it if negative, it means that the work done is opposite to the force field.
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A tennis ball is thrown vertically upward with an initial velocity of +6.2 m/s. What will the ball’s velocity be when it returns
anastassius [24]

Answer:

v_{f}=-6.2 m/s

Explanation:

The ball will rise decreasing its speed until it reaches the highest point where its speed will be zero. From this point the tennis ball will begin to fall again, in the free fall the tennis ball will gain speed but now in the opposite direction. When it returns to the same point where it was launched, its speed will be the same as the one that was launched but with the opposite sign.

v_{f}=-6.2 m/s

We can check this using the equation:

v_{f}^2=v_{i}^2+2gh

where v_{i}=+6.2 m/s

ang h is the height, but because the ball returns to the same point where it started, h =0

then

v_{f}^2=v_{i}^2

v_{f}=v_{i}

the initial and final velocity will be the same in number, but we know that the ball is going in the opposite direction, so the final velocity must have the opposite sign from the initial velocity

so if v_{i}=+6.2 m/s,

v_{f}=-6.2 m/s

4 0
2 years ago
An electromagnet does not attract a piece of iron.Is it true ? Give reason
Zina [86]

Answer:

False..

Explanation:

An electoMagnets attract iron due to the influence of their magnetic field upon the iron. ...

8 0
2 years ago
Which characteristic of enzymes allows it to be highly specific in the reactions they catalyze?
MaRussiya [10]
Its structure.

The function of the enzymes are determined by their structure.
7 0
3 years ago
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Elements known as noble gases do not have the ability or the room in their valence
Eva8 [605]

Answer:

true

Explanation:

noble gases are octet meaning they they have eight electrons in their outer shell so the are stable

4 0
2 years ago
calculate the energy dissipated by an electric iron which draws a current of 5A from a240v power supply for 25minutes​
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Explanation:

Given,

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Now,

Energy dissipated = IVT= 5×240×1500 = 1800000 J

4 0
2 years ago
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