Answer:
The mass of the copper is 3.00kg
Explanation:
Answer:
The amount of force and the angle between them.
Explanation:
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:
The kangaroo was 1.164s in the air before returning to Earth
Explanation:
For this we are going to use the equation of distance for an uniformly accelerated movement, that is:
Where:
x = Final distance
xo = Initial point
Vo = Initial velocity
a = Acceleration
t = time
We have the following values:
x = 1.66m
xo = 0m (the kangaroo starts from the floor)
Vo = 0 m/s (each jump starts from the floor and from a resting position)
a = 9.8 m/s^2 (the acceleration is the one generated by the gravity of earth)
t =This is just the time it takes to the kangaoo reach the 1.66m, we don't know the value.
Now replace the values in the equation
It takes to the kangaroo 0.582s to go up and the same time to go down then the total time it is in the air before returning to earth is
t = 0.582s + 0.582s
t = 1.164s
The kangaroo was 1.164s in the air before returning to Earth
Answer:
The resistance of the bulb is 1000 ohms.
Explanation:
What is the resistance of a bulb that is connected to a 20 v source through which a current of 20 mA passes
We have,
Voltage of the bulb is 20 V and the current passes is 20 mA.
It is required to find the resistance of the bulb. The relation between resistance, current and voltage is given by using Ohm's law as :
V = IR
R is resistance
So, the resistance of the bulb is 1000 ohms.