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.
Answer: You do not specify what is being asked for. ∆E? ∆H?
∆E = (430 - 238) J = 192 J
∆H = 430 J
Explanation:
If asked for the value of ∆H the answer is simply the change in heat, and in the question, it states introduction of 430 J of heat is causing the system to expand.
Therefore ∆H = 430 J
If asked for ∆E, we know that ∆E = ±q (heat) + work (-P∆V) = ±q + w
The question states that 238 J of work are done AND the system expanded
(work is negative because expansion means work is done BY the system, releasing energy/heat... Conversely, if the system were compressed, work is done ON the system, absorbing heat/energy)
Therefore, ∆E = (430 - 238) J = 192 J
The strength of the gravitational forces between two objects depends on
the masses of both objects and on the distance between their centers.
I don't think you can say that one or the other is the "<em>main</em>" influence.
-- If each mass is multiplied by ' k ', then the forces between them are
multiplied by ' k² '.
-- And if the distance between them is multiplied by ' k ', then the forces
between them are divided by ' k² '.
Seems pretty equal to me.
Answer:
The wolf's kinetic energy is 12000 J.
Explanation:
Kinetic energy is calculated as follows:
Where m stands for mass (in kg) and v for velocity in m/s, thus:
Answer:
high frequent sound
Explanation:
because if its low than its slower.