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3 years ago

An ___________ is a current-carrying wire wrapped around an iron core.

Physics

2 answers:

mestny [16]3 years ago

4 0

That could be an electromagnet,
and it could also be an solenoid.

Rasek [7]3 years ago

4 0

Your answer is simply, a <span>electromagnet.</span>

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Two cyclists, who weigh the same and have identical bicycles, ride up the same mountain, both starting at the same time. Joe rid

RSB [31]

Answer:

Option-A

Explanation:

In the given question, two cyclists of equal weight are riding the same mountain with cycles of the same weight but Joe reaches the top before Bob.

This scenario can be explained in terms of power and if we ignore the force of wind resistance and friction. Power refers to the work done per unit time, therefore, P= W/t. Since Joe rides up straight earlier than Bob shows that Joe has exerted more power than Bob that is the amount of work done by the Joe is greater than Bob.

Thus, Option-A is the correct answer.

7 0

4 years ago

The electrons in the beam of a television tube have a kinetic energy of 2.20 10-15 j. initially, the electrons move horizontally

dalvyx [7]

(a) The electrons move horizontally from west to east, while the magnetic field is directed downward, toward the surface. We can determine the direction of the force on the electron by using the right-hand rule:
- index finger: velocity --> due east
- middle finger: magnetic field --> downward
- thumb: force --> due north
However, we have to take into account that the electron has negative charge, therefore we have to take the opposite direction: so, the magnetic force is directed southwards, and the electrons are deflected due south.

b) From the kinetic energy of the electrons, we can find their velocity by using
$K= \frac{1}{2}mv^2$
where K is the kinetic energy, m the electron mass and v their velocity. Re-arranging the formula, we find
$v= \sqrt{ \frac{2K}{m} }= \sqrt{ \frac{2 \cdot 2.20 \cdot 10^{-15} J}{9.1 \cdot 10^{-31} kg} }=6.95 \cdot 10^7 m/s$

The Lorentz force due to the magnetic field provides the centripetal force that deflects the electrons:
$qvB = m \frac{v^2}{r}$
where
q is the electron charge
v is the speed
B is the magnetic field strength
m is the electron mass
r is the radius of the trajectory
By re-arranging the equation, we find the radius r:
$r= \frac{mv}{qB}= \frac{(9.1 \cdot 10^{-31} kg)(6.95 \cdot 10^7 m/s)}{(1.6 \cdot 10^{-19} C)(3.00 \cdot 10^{-5} T)}=13.18 m$

And finally we can calculate the centripetal acceleration, given by:
$a_c = \frac{v^2}{r}= \frac{(6.95 \cdot 10^7 m/s)^2}{13.18 m}=3.66 \cdot 10^{14} m/s^2$

5 0

4 years ago

Which of the following is a source of thermal energy that is absorbed by Earth's atmosphere?

Mazyrski [523]

Answer:

100% of the energy entering earth's atmosphere comes from the sun. ~50% of the incoming energy is absorbed by the earth's surface i.e. the land and oceans.

8 0

3 years ago

Please help <br> Physics is so confusing

crimeas [40]

Answer:

below

Explanation:

sin a = 4/5

a = 53.1

tan theta = 3/4

theta = 36.89

4 0

3 years ago

A laser dazzles the audience in a rock concert by emitting green light with a wavelength of 533 nm . Calculate the frequency of

atroni [7]

Answer:

f = 5.63 x 10¹⁴ Hz

Explanation:

Given,

speed of light, c = 3 x 10⁸ m/s

wavelength,λ = 533 n m = 5.33 x 10⁻⁷ m

frequency, f = ?

using formula of frequency

$f = \dfrac{c}{\lambda}$

c is the speed of light

$f = \dfrac{3\times 10^{8}}{5.33\times 10^{-7}}$

f = 5.63 x 10¹⁴ Hz

hence, the frequency of the light is equal to f = 5.63 x 10¹⁴ Hz

5 0

4 years ago