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SIZIF [17.4K]
3 years ago
6

. What is the mass number of the isotope lithium-7?

Physics
2 answers:
Alex17521 [72]3 years ago
7 0

Answer:

7

Explanation:

isotopes are named after there mass number. because there mass number is different and protons no is same

lana66690 [7]3 years ago
4 0

Answer:

7

Explanation:

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C.There is an invisible magnetic field around the magnet where it exerts magnetic force

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2 years ago
A car tire rotates with an average angular speed of 32 rad/s. In what time interval will the tire rotate 3.5 times? Answer in un
stiks02 [169]

Answer:

\Delta t = 0.687\ s

Explanation:

given,

Angular speed of the tire = 32 rad/s

Displacement of the wheel = 3.5 rev

Δ θ = 3.5 x 2 π

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now,

Time interval of the car to rotate 7π rad

using equation

\omega_{avg} =\dfrac{\Delta \theta}{\Delta t}

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Time taken to rotate 3.5 times is equal to 0.687 s.

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The answer is B.

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3 years ago
Which item is necessary to make an electromagnet? Question 4 options: Render of a wooden cube with sharp edges, coordinating pat
BlackZzzverrR [31]

The electromagnet is a device that requires conducting wires wrapped around the iron core.

For making an electromagnet, the most necessary item is a copper wire.

What is an Electromagnet?

An electromagnet is a device that has conducting wires wrapped around an iron core. When electricity is passed through the wires, a magnetic field is generated. The setup acts as a strong magnet.

In order to make an electromagnet, a current-carrying wire is needed to wrap around a magnetic material. The current-carrying wires will play the role of conducting wires and the conducting wires are necessary to make an electromagnet. These wires can be made of copper.

Thus, we can conclude that for making an electromagnet, the most necessary item is a copper wire.

Learn more about the electromagnet here:

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