240 to the nearest tenth
2 answers:
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Answer:
<em>P = 66.67 W</em>
Explanation:
<u>Joule Heating</u>
It's the process by which the electric current passing through a conductor produces heat.
Also known as Joule's first law or the Joule–Lenz law, states that the power of heating generated by an electrical conductor (P) is proportional to the product of its resistance (R) and the square of the current (I).
It can be described by the equation that follows:
Also, we can calculate the voltage V with the formula of Ohm's law:
Combining both equations, power can be related to the voltage:
Given the power and the voltage, the resistance can be calculated by solving for R:
There are two bulbs marked P=200W V=250V and P=100 W V=250.
The first bulb has a resistance of:
The first bulb has a resistance of:
When connected in series, the total resistance is
The total power consumed when connecting them to a V=250 V supply is:
P = 66.67 W
Answer:
2.86 m
Explanation:
Given:
M₁ = 10 kg
M₂ = 5 kg
= 0.5
height, h = 5 m
distance traveled, s = 2 m
spring constant, k = 250 N/m
now,
the initial velocity of the first block as it approaches the second block
u₁ = √(2 × g × h)
or
u₁ = √(2 × 9.8 × 5)
or
u₁ = 9.89 m/s
let the velocity of second ball be v₂
now from the conservation of momentum, we have
M₁ × u₁ = M₂ × v₂
on substituting the values, we get
10 × 9.89 = 5 × v₂
or
v₂ = 19.79 m/s
now,
let the velocity of mass 2 when it reaches the spring be v₃
from the work energy theorem, we have
Work done by the friction force = change in kinetic energy of the mass 2
or
or
v₃ = 20.27 m/s
now, let the spring is compressed by the distance 'x'
therefore, from the conservation of energy
we have
Energy of the spring = Kinetic energy of the mass 2
or
on substituting the values, we get
or
x = 2.86 m