Answer:
Q = 735 J
Explanation:
In this exercise we must assume that all the mechanical energy of the system transforms into cemite energy.
Initial energy
Em₀ = U = m g h
final energy
= Q
Em₀ = Em_{f}
m g h = Q
let's calculate
Q = 30 9.8 2.5
Q = 735 J
Answer:
0.152724283058 rad/s
Explanation:
In this system the angular momentum is conserved
Change in angular velocity is
The change in angular velocity is 0.152724283058 rad/s
Point of Aries is a celestial body which can be used to measure sidereal day.
<h3>What is a
sidereal day?</h3>
A sidereal day can be defined as an amount of time that it takes planet Earth to rotate once about its axis relative to the stars, so that distant stars appear within the same position in the sky.
Based on astronomical information and records, Point of Aries is a celestial body which can be used to measure sidereal day because it's the amount of time between two (2) consecutive transits of the First Point of Aries.
Read more on sidereal day here: brainly.com/question/12169125
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In an electric motor, periodically changing the direction of current in the electromagnet can cause the axle to spin because of the reversing of magnetic field direction.
Explanation
An electric motor consists of a long rod termed as axle which is connected to the electric current.
When the current will be flowing through the axle, a magnetic field will be generated around the axle due to magnetic induction.
The axle is positioned between two strong electromagnets. So when the magnetic field is generated around the axle, depending upon the direction of flow of current, the magnetic field can get attracted or repelled by the electromagnets.
Thus the change in the direction of current flow will lead to reverse in the direction of magnetic field generated around the axle causing it to spin.