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Tatiana [17]
3 years ago
6

A coil of wire can become a temporary magnet if connected to a battery O True O False

Physics
1 answer:
GrogVix [38]3 years ago
4 0

Answer:

true

Explanation:

An Electromagnet is called as a temporary magnet, because electromagnet is made up of insulated copper wire wrapped around soft iron, which allows current to flow in it and at that moment iron gains it magnetic properties and when the current is switched off, then there will be no flow of current and hence iron loses its magnetic properties.  

Hence it works temporarily as long as electric current flows in a conductor and hence known as temporary magnet. .

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It has been suggested that rotating cylinders about 9 mi long and 5.9 mi in diameter be placed in space and used as colonies. Wh
mezya [45]

Answer:

\omega = 4.5\times 10^{-2} rad/s

Explanation:

Given data:

Rotating cylinder length = 9 mi

diameter of cylinder is 5.9 mi

we know that linear acceleration is given as

a =  r ω^2

where ω is angular velocity

so\omega = \sqrt{\frac{a}{r}}

r = \frac{5.9}[2} \frac{1609 m}{1 mi} = 4.746\times 10^{3} m

\omega = \sqrt{\frac{9.80}{4.746\times 10^{3}}}

\omega = 4.5\times 10^{-2} rad/s

7 0
3 years ago
A boy sits motionless partway down a playground slide. The force of friction balances the force of gravity. A girl hands the boy
DanielleElmas [232]

C.  

The force of friction = coefficient of friction * normal force.  

Adding the book to the boy increases the normal force and the component of the gravitational force directed down the slide.  This in turn increases the force of friction as can be seen by the relationship from the above equation.  For a stationary object, the force of static friction is always equal to the force applied (in this case, it is the component of the gravitational force directed down the slide).  That means that so long as the boy is not moving and his mass increases, the frictional force is increasing also to balance the increased downward gravitation force directed down the slide.

5 0
3 years ago
The acceleration of gravity on the surface of Earth is 9.8 m/s / s . On the Moon the acceleration of gravity is 1/6 of this valu
qwelly [4]

Answer:

60(9.8 / 6) = 98 N

Explanation:

4 0
3 years ago
You compress a spring by a distance of 0.2 m. The spring has a spring constant of 37 N/m. When you release the spring, it snaps
Serggg [28]
At that point it is no longer trying to uncompress nor is it trying to stretch.  This is the same thing as a pendulum at the bottom of its swing, no longer falling but not yet rising against gravity.  Thus the kinetic energy there is the same as the potential energy when it is compressed.  The energy of compression is
\frac{1}{2}k x^{2}
This gives E=0.5(37)(0.2)²=0.74J
This is the same as the kinetic energy when it is at natural length
7 0
3 years ago
Read 2 more answers
A flea walking along a ruler moves from the 45 cm mark to the 27 cm mark. It does this in 3 seconds. What is the speed? What is
ad-work [718]

Answer:

Explanation:

In the calculation of distance we do not take into account the direction of movement .So only magnitude of movement is taken care of.

On the other hand , in respect of displacement , we take into account even direction of movement along with magnitude.

Distance covered by flea = 45 - 27 = 18 cm

Displacement by flea = 27 - 45 = - 18 cm

Speed = Distance covered / time

= 18 / 3 = 6 cm / s

Velocity = - 18 / 3 = - 6 cm /s.

3 0
3 years ago
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