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scZoUnD [109]
3 years ago
15

What is Electromagnet? What is Voltage?

Physics
1 answer:
vampirchik [111]3 years ago
8 0

Answer: a core of magnetic material

Explanation:

A core of magnetic material surrounded by a coil of write through which an electric current is passed to magnetize the core

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Explain why is not advisable to use small values of I in performing an experiment on refraction through a glass prism?
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Explain<span> why it is </span>not advisable to use small values<span> of incident ray in </span>performing experiment<span> on the</span>refraction through a glass prism<span>.</span>
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The flash unit in a camera uses a 3.0 V battery to charge acapacitor. The capacitor is then discharged through a flashlamp.The d
Varvara68 [4.7K]

Answer:

C=2.54\cdot 10^5\ F

Explanation:

<u>Energy Stored on a Capacitor</u>

This energy is stored in the electric field present when a voltage V is applied to a capacitor C. It can be computed by the formula

\displaystyle  E=\frac{CV^2}{2}

We can compute the energy by knowing the power dissipated in the flashlamp is P=8 W in a time of 7 \mu s=7\cdot 10^{-6}\ sec

\displaystyle  E=\frac{P}{t}=\frac{8\ W}{7\cdot 10^{-6}\ sec}=1.14\cdot 10^6\ J

Solving the first equation for C

\displaystyle  C=\frac{2E}{V^2}

\displaystyle  C=\frac{2\times 1.14\cdot 10^6}{3^2}

\boxed{C=2.54\cdot 10^5\ F}

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Hypothesis why would momentum not be conserved when 2 vehicles collide?
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The momentum does not stop till both objects are at a complete stop
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w = 39,240 N

First list what you know. You know the elephants mass and it’s height. You also know gravity on Earth. I will use g = 9.81.
m = 4,000 kg
h = 20 m
g = 9.81 m/s^2

You need to find the elephants weight. Weight = mass x gravity
w = mg
w = (4000 kg)(9.81 m/s^2)
w = 39,240 N (N = newtons)

Now, knowing the elephants weight, you can calculate its GPE.
Gravitational Potential Energy = weight x height

GPE = wh
GPE = (39,240N)(20m)
GPE = 78,380 J (J = joules)
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3 years ago
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