A block with a mass of 3.7 kg slides with a speed of 2.2 m/s on a frictionless surface. The block runs into a stationary spring
1 answer:
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Answer:
The magnification is 0.3
Explanation:
Given:
The focal length of the convex mirror, f = 15 cm
for convex mirror f = -f = -15 cm
The distance of object, u = 35 cm
Height of the object, h = 2 cm
Now, using the mirror formula, we have
where, v is the distance of the image
on substituting the values, we get
or
or
v = -10.5 cm
now, the magnification (m) is given as:
m =
on substituting the values, we get
m =
or
m = 0.3
Hence, the magnification is 0.3
Answer:
Explanation:
The power delivered in the wire is given by:
where V is the voltage of the battery and R is the resistance of the wire.
Since the voltage of the battery is constant, we can rewrite this equation as follows:
(1)
At the beginning, the initial resistance is , and the power delivered is
. Later, when the temperature increases, the power becomes
, and the new resistance is
. Using (1), we can write
(2)
So, the new resistance must be 3/2 of the initial resistance.
We know that the resistance increases linearly with the temperature, as
where
is the temperature coefficient
is the change in temperature
Using (2), we can rewrite this equation as
and we find:
So, the new temperature of the wire must be