Answer:
a. 
is the time after which the two stone hit the water surface.
b. 
c. 
& 
Explanation:
Given:
- height of the cliff,
- time gap between the projection of stones,
- initial velocity of first stone,
Here positive sign means that the stone is thrown vertically downward in the direction of gravity.
a.
Using equation of motion:
is the time after which the two stone hit the water surface.
b.
using the equation of motion for second stone:
c.
Final velocity of the stone at the instant of touching the water surface:
&
Answer:
<em>Magnitude of frictional force = 30 N</em>
Explanation:
According to the second Newton's law, the net force exerted by an external agent on an object of mass m is:
Fn=m.a
The net force is the vector addition of each individual force. If the sum of all the forces acting on an object is zero, then the acceleration is zero. That means the object moves at a constant speed or is at rest.
When an object is pushed across a horizontal rough surface, there are two forces acting in the direction of the motion: The applied force and the frictional force.
If the applied force is greater than the frictional force, then the object moves at a constant positive acceleration. If the frictional force is greater than the applied force, then the object won't move at all (if it was at rest) or will start a deaccelerated motion (braking).
Finally, if both forces are equal, the object will move at a constant speed or remains at rest. Since the box is moving at a constant speed, we can conclude the frictional force equals the applied force:
Magnitude of frictional force = 30 N
It goes away and goes off to catalyze more things. Imagine it like the priest of a wedding. S/He's just catalyzing the bond between two entities, and s/he will continue to do that, not having anything to do with the bond past its creation.
As always,. F = M A.
Centripetal acceleration = V-squared / R. So F=M V-squared/R. =. 85 x 225 / 20. = 956.25 Newton's (about 215 pounds). That's the force required to keep that mass moving at that speed around that circle. If the force is less, or not there, then the 85 kg moves slower, or leaves that path.
The difference between heterozygous and homozygous is that heterozygous has to do with different genes, while homozygous has to do with the same genes.
