Answer:
Explanation:
Given
Force P is acting upward
C is vertical contact Force
W is the weight of the crate
As P is unable to move the Block therefore Normal reaction keeps on acting on block
thus we can say that
P-W+C=0
P=W-C
Which of the following statements is/are true? Check all that apply. Check all that apply. The work done by a nonconservative fo
1 answer:
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Incomplete question.The complete question is here
Determine the torque applied to the shaft of a car that transmits 225 hp and rotates at a rate of 3000 rpm.
Answer:
Torque=0.51 Btu
Explanation:
Given Data
Power=225 hp
Revolutions =3000 rpm
To find
T( torque )=?
Solution
As
As force moves an object through a distance, work is done on the object. Likewise, when a torque rotates an object through an angle, work is done.
So
(a) 34 V
The average emf induced in the loop is given by Faraday-Newmann-Lenz law:
(1)
where
is the variation of magnetic flux through the coil
is the time interval
We need to find the magnetic flux before and after. The magnetic flux is given by:
where
B is the magnetic field intensity
A is the area of the coil
The radius of the coil is r = 12.0 cm = 0.12 m, so its area is
At the beginning, the magnetic field is
so the flux is
while after the removal of the coil, the magnetic field is zero, so the flux is also zero:
so the variation of magnetic flux is
And substituting into (1) we find the average emf in the coil
(b) Counterclockwise
In order to understand the direction of the induced current, we have to keep in mind the negative sign in Lenz's law (1), which tells that the direction of the induced current must be such that the magnetic field produced by this current opposes the variation of magnetic flux in the coil.
In this situation, the magnetic flux through the coil is decreasing, since the coil is removed from the field. So, the induced current must be such that it produces a magnetic field whose direction is the same as the direction of the external magnetic field, which is upward along the positive z-direction.
Looking down from above and using the right-hand rule on the loop (thumb: direction of the current, other fingers wrapped: direction of magnetic field), we see that in order to produce at the center of the coil a magnetic field which is along positive z-direction, the induced current must be counterclockwise.