a tin containing 5000cm>3 of paint has a mass of 7kg.if the mass of the empty tin including the lid is 0.5kg calculate the de
1 answer:
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Answer:
Noise level will be -18.2 watt
So option (b) will be correct answer
Explanation:
We have given sound intensity
And threshold intensity ( in question it is given as
but its standard value is
)
Now noise level
So the noise level will be -18.2
So option (b) will be correct answer
Answer:
Vf = 21.5 [m/s]
Explanation:
To solve this problem we must use the following kinematics equation:
where:
Vf = final velocity [m/s]
Vi = initial velocity = 0
a = aceleration = 4.3 [m/s^2]
t = time = 5 [s]
Now replacing:
Vf = 0 + (4.3*5)
Vf = 21.5 [m/s]
A pendulum oscillates 40 times in 4 seconds. Find it's time period and frequency.
- The time period
- Its Frequency
Frequency of oscillation is defined as the number of oscillation of a vibrating body per second.It is given by
The time period
The time required to complete one oscillation is known as Time period.
It is given by the inverse of the frequency.
________________
Therefore the frequency is
And the time period is
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Resistance decreases the flow of current in a circuit.
EXPLANATION:
The resistance of an electrical circuit is defined as the opposition to the flow of current in that particular circuit.
From Ohm's law, we know that current flowing through a wire I =
Here,V is the potential across the two ends of a conductor or wire, and R is the resistance of that wire.
Hence, more is the resistance, the less will be the current flow in the current.