A car runs along a horizontal path at speed of 20m/s.The driver observes the rain hitting his car at 60 to vertical.If rain is a
1 answer:
Answer:
The speed of the raindrop is 11.55 m/s.
Explanation:
We need to find the speed of the rain in the "y" direction. We have:
: speed of the raindrop at 60° (vertical) =?
: speed of the car = 20 m/s (in the "x" direction)
Hence, the speed of the car and the speed of the raindrop are related by:
Therefore, the speed of the raindrop is 11.55 m/s.
I hope it helps you!
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Answer:
W = 3.12 J
Explanation:
Given the volume is 1.50*10^-3 m^3 and the coefficient of volume for aluminum is β = 69*10^-6 (°C)^-1. The temperature rises from 22°C to 320°C. The difference in temperature is 320 - 22 = 298°C, so ΔT = 298°C. To reiterate our known values we have:
β = 69*10^-6 (°C)^-1 V = 1.50*10^-3 m^3 ΔT = 298°C
So we can plug into the thermal expansion equation to find ΔV which is how much the volume expanded (I'll use d instead of Δ because of format):
So ΔV = 3.0843*10^-5 m^3
Now we have ΔV, next we have to solve for the work done by thermal expansion. The air pressure is 1.01 * 10^5 Pa
To get work, multiply the air pressure and the volume change.
W = 3.12 J
Hope this helps!
Answer:
The answer is D, I just took the test
Explanation:
Here we will say that there is no external torque on the system so we will have
here we know that
where we know that
Also we know that
initial angular speed will be
now from above equation
now we have
so final speed will be 2.41 rad/s