Answer:
A. 1.6 N/cm
Explanation:
spring constant = 21/13 = 1.6 N/cm
Answer:
Frictional force opposes relative motion between surfaces
Explanation:
Friction that exists when the object is not moving is called static friction. In static friction ,If we are applying a force in the object the frictional force is in the opposite direction . If it is not the case, there have been some net force and the object starts accelarating.
The main component of the contact force of two objects is normal force and that is in the perpendicular direction. Frictional force is other complnent. This frictional force is parallel to the interface between objects. Frictional force opposes relative motion between surfaces.
Answer:
Part a)
Part b)
Explanation:
As we know that the observer is standing in front of one speaker
So here the path difference of the two sound waves reaching to the observer is given as
now phase difference is related with path difference as
here in order to find the wavelength
now we have
Part b)
Now we know that when phase difference is odd multiple of 
then in that case the the sound must be minimum
So nearest value for minimum intensity would be
so we have
so we have
now we have
Answer:
Clouds
Explanation:
Clouds float in the sky but do not have wings like a bird or plane.
Clouds drop rain, or "cry," but do not have eyes like an animal.
When clouds are overhead, they block the sun and thus create an area of darkness.
