Answer:
v = 315 m/s
Explanation:
given,
length of the string = 64.3 cm
frequency at fundamental mode = 245 Hz
speed of sound = 345 m/s
speed of the transverse waves = ?
here
wavelength = twice length of string
λ = 2 L
λ = 2 × 64.3
λ = 128.6 cm = 1.286 m
using formula
v = ν λ
v = 245 × 1.286
v = 315.07 m/s
Hence, the speed of the transverse wave on the string will be equal to v = 315 m/s
The primary coil has more turns than the secondary coil. so D.
Answer:
4) True. The change of direction needs an unbalanced force
Explanation:
Let us propose the resolution of the problem using Newton's second law.
F = m a
As the car is spinning the acceleration is centripetal
a = v2.r
F = m v2 / r
We can see that as the velocity of a vector even if its module does not change, the change of direction requires an external force.
Now we can analyze the statement if they are true or false
1) and 3) False, even when the speed changes, the direction changes
2) False with the speed change can be determined
4) True. The change of direction needs an unbalanced force
5) False are different things. the direction is where it is going and the speed is the magnitude of the vector
b) accelerate to the left as much more pressure is pulling it in that direction and on the right however , there is less force .
Between the top of the first and the top of the second loop, the coaster has lost potential energy = mgh, where h = 22.2 - 15 = 7.2m
This energy would have converted to Kinetic. Write out an equation and the masses will cancel out. Does that hint help you to find the solution? If not, I will give you another hint.
