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3 years ago

What is one advantage of using electromagnets instead of permanent magnets

2 answers:

5 0

The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet that needs no power, an electromagnet requires a continuous supply of current to maintain the magnetic field.

olganol [36]3 years ago

4 0

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You walk 10 miles north, 20 miles south, and 5 miles north. Taking north to be the positive y direction, define a position vecto

gulaghasi [49]

Considering north as positive Y axis

First 10 miles north means a positive 10 displacement along y direction

Second 20 miles south means a negative 20 displacement along y direction

Third 5 miles south means a positive 5 displacement along y direction

So total displacement = 10 - 20 + 5 = -5 miles displacement

So position vector of the final position = - 5 j

3 0

4 years ago

A spring attached to a mass is at rest in the initial

svet-max [94.6K]

Answer:

E=(1/2)kx^2

Explanation:

6 0

3 years ago

Read 2 more answers

The altitude of the International Space Station ttt minutes after its perigee (closest point), in kilometers, is given by \qquad

Dmitriy789 [7]

Answer:

T = 92.8 min

Explanation:

Given:

The altitude of the International Space Station t minutes after its perigee (closest point), in kilometers, is given by:

$A(t) = 415 - sin(\frac{2*\pi (t+23.2)}{92.8})$

Find:

- How long does the International Space Station take to orbit the earth? Give an exact answer.

Solution:

- Using the the expression given we can extract the angular speed of the International Space Station orbit:

$A(t) = 415 - sin({\frac{2*\pi*t }{92.8} + \frac{23.2*2*\pi }{92.8} )$

- Where the coefficient of t is angular speed of orbit w = 2*p / 92.8

- We know that the relation between angular speed w and time period T of an orbit is related by:

T = 2*p / w

T = 2*p / (2*p / 92.8)

Hence, T = 92.8 min

7 0

3 years ago

Orion, also called the Hunter, has three stars that make up Orion's belt.

ruslelena [56]

Answer - B. Betelguese.

I really hope this helps!!

8 0

3 years ago

A disc is thrown through the air for 1.5 min with a power output of 12.5 W. How much work is done when throwing the disc?

klasskru [66]

Answer:

work = 1125 [J]

Explanation:

To solve this problem we must remember the definition of power, which is defined as the relationship between work and time. The power can be calculated using the following equation:

Power = work/time

Power = 12.5 [w]

work = joules [J]

time = 1.5 [min] = 90 [s]

work = 12.5*90

work = 1125 [J]

7 0

3 years ago