3 years ago

What benefit is gained by the addition of the iron core in an electromagnet

Physics

1 answer:

kondaur [170]3 years ago

5 0

It increases the magnetic attraction between the electromagnet(s)

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A ball is dropped from a height of 20 meters. At what height does the ball have a velocity of 10 meters/second?

borishaifa [10]

Answer:B

Explanation:

Initial velocity, u=0m/s

Distance,s=20m

a=+g=9.8m/s*s

Using v*v=u*u+2gs

v*v=0+2*9.8*20

v*v=392

v=19.8

When s=20m, v = 19.8m/s

Therefore when v = 10m/s, s= 10*20/19.8

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3 years ago

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olga2289 [7]

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2 years ago

A box is sliding down an incline tilted at a 11.1° angle above horizontal. The box is initially sliding down the incline at a sp

raketka [301]

Answer:s=0.68 m

Explanation:

Given

Inclination $\theta =11.1^{\circ}$

Speed of block(u)=1.6 m/s

Coefficient of kinetic Friction $\mu _k=0.39$

deceleration provided by friction=g\sin \theta -\mu _kg\cos \theta [/tex]

Using $v^2-u^2=2as$

Final velocity v=0

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3 years ago

Which of these is a TRUE statement

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Sound travels through solids and liquids at the same speed

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Because sound needs a dencer object to travel fast and since both liquid and solids are closer than gas sound travles faster in them.

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