Sorry, I just assumed that constructive interference means the interference is maximally constructive because I only know how to solve questions when the interference is maximally constructive or maximally destructive.
I am not surprised that the answer is wrong because the textbook has lots of...
Homework Statement
Two in-phase loudspeakers, which emit sound in all directions,
are sitting side by side. One of them is moved sideways by 3.0 m,
then forward by 4.0 m. Afterward, constructive interference is
observed 1/4 and 3/4
of the distance between the speakers along the
line that joins...
Homework Statement
An object with a mass of 5kg is placed on a horizontal surface and it has a semi-circular orbit with radius 1m. Its left end is close to a baffle fixed on the ground. A ball with a mass of 1kg is released from the point A by static. The surface and the groove are both smooth...
The factor is less than 1?
A0/At=√10^0.8 and At=e-t/τ A0
Then e-t/τ = 1/√10^0.8
t=1,
I got τ=1.08s which is twice the answer, 0.54s, though, but I don’t see why I have to divide 1.08 by 2.
Thank you for reply:)
So does that mean amplitude will decrease by a factor of √10^0.8 ?
If so, then e^-t/τ =√10^0.8,
t=1, I got τ=1.08s which is not the right answer:(
Can any one tell me where I went wrong?
Thank you!
Homework Statement
A vibrating standing wave on a string radiates a sound wave with intensity proportional to the square of the standing-wave amplitude. When a piano key is struck and held down, so that the string continues to vibrate, the sound level decreases by 8.0 dB in 1.0 s.
What is the...
Sorry, I still don't understand how WA=0(work done on A equals zero) helps me to understand part b...
If we only consider the interactions between A,B and C, excluding the external forces, the total change in kinetic energy is WB+WC=10-5=5J, which makes the total change in potential energy equal...
So if we consider A, B and C as one system, the ΔKtot is 14 + 13 =17J. Then the change in potential energy should be -17J since the energy is conserved in an isolated system, am I correct?
But the answer says change in potential energy is 5J, I don't understand:sorry:
Homework Statement
Object A is stationary while objects B and C are in motion.
Forces from object A do 10 J of work on object B and –5 J of
work on object C. Forces from the environment do 4 J of work
on object B and 8 J of work on object C. Objects B and C do
not interact. What are ΔKtot and...
I think it should be horizontal because if the plane is parallel to the incline of the slope, the object, in this case, the cart, will move up the slope, which is not what happened.
Sorry, I meant mrω2+mgx actually.
So is the rotational plane horizontal or is it parallel with the incline of the slope?
In other words, does the Tx act as centripetal force or does T act as the centripetal force?
Thank you :)
Thank you for reply!
I got tention as 179.2n, but the answer I got from other sources is 185n.
The fbd they used is different than mine though.
https://cloud.smartdraw.com/share.aspx/?pubDocShare=3584F28114431EA1F27BA700C6061213131
They said Tention= mrw^2-mgx
Which one is correct?
Homework Statement
The father stands at the summit of a conical
hill as he spins his 20 kg child around on a 5.0 kg cart with a
2.0-m-long rope. The sides of the hill are inclined at 20 degrees. He
keeps the rope parallel to the ground, and friction is negligible.
What rope tension will allow...