Answer:
compass needle normally points toward Earth's magnetic pole, which is near the North Pole. Which best explains why the
eedle moves away from the pole when it comes close to a current-carrying wire?
Current within the wire weakens the magnetic force of the pole.
Magnetism surrounding the wire weakens the magnetic force of the nole
Explanation:
Answer:
<em>The velocity is 39.24 m/s</em>
<em></em>
Explanation:
The time of fall t = 4 seconds
The initial velocity u = 0 m/s (since the ball is dropped, meaning it starts from rest)
Final velocity v = ?
Using
v = u + gt
where g is the acceleration due to gravity = 9.81 m/s^2
substituting, we'll have
v = 0 + (9.81 x 4)
v = <em>39.24 m/s</em>
Answer:
The minimum frequency is 702.22 Hz
Explanation:
The two speakers are adjusted as attached in the figure. From the given data we know that
=3m
=4m
By Pythagoras theorem
Now
The intensity at O when both speakers are on is given by
Here
- I is the intensity at O when both speakers are on which is given as 6
- I1 is the intensity of one speaker on which is 6
- δ is the Path difference which is given as
- λ is wavelength which is given as
Here
v is the speed of sound which is 320 m/s.
f is the frequency of the sound which is to be calculated.
where k=0,1,2
for minimum frequency , k=1
So the minimum frequency is 702.22 Hz