The dimensions for force are the product of mass and length divided by time squared. Newton's second law states that force equal
1 answer:
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Answer:
2324 J
Explanation:
The formula for work is:
where is the force applied, and
is the distance moved, in this case
and we need to find
Since the crate is not moving up or down, we conclude that the <u>normal force must be equal to the weight </u>of the object:
where is the normal force and
is the weight, which is:
, where g is the gravitational acceleration
and
is the mass
.
---------
Thus the normal force is:
Now, the force due to the friction is defined as:
where is the coefficient of friction,
So, for the crate to move, the force applied must be equal to the frictional force:
And now that we know the force we can calculate the work:
substituting known values:
Answer:
-17.8 V
Explanation:
The induced emf in a coil is given as:
where N = number of loops
dB = change in magnetic field
r = radius of coil
dt = elapsed time
From the question:
N = 50
dB = final magnetic field - initial magnetic field
dB = 0.35 - 0.10 = 0.25 T
r = 3 cm
dt = 2 ms = 0.002 secs
Therefore, the induced emf is:
Note: The negative sign implies that the EMf acts in an opposite direction to the change in magnetic flux.