Answer:
Tortoise has the greatest momentum
Explanation:
Momentum of tourtise (p)=mass×velocity
=275×0.55
=151.25 kgm/s
Answer:
Explanation:
a ) The sprinter at the very start of the race , pushes hard the ground under his feet in backward direction . The harder he presses the ground backwards , the greater reaction force he receives back in forward direction , throwing him forward direction. This force creates acceleration.
b ) The frictional force acting in opposite direction on the motion of ball creates - ve acceleration .
c ) The frictional force acting opposite to the motion of the ball creates - ve acceleration. The gravitational force acting on the ball in downward direction creates positive acceleration on the ball.
d ) The restoring force created in the bungee chord due to its extension creates acceleration in him in upward direction.
Answer:
The direction of current in the second wire will be upward.
Explanation:
We first need to find the direction of the magnetic field due to the first wire using the right-hand thumb rule.
Knowing that, one can easily find the direction of the second wire by using the right-hand rule.
The force per unit length on wire 2 due to wire 1 is given by,
Therefore,
<em>Image attached for better understanding of the problem.</em>
<em>(Source: http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/wirfor.html)</em>
Answer:
Explanation: A boy sitting on a chair.. Assuming the boy has a weight of 50N and he sits on the chair. He will exert a downward force of +50N while the chair will exert an upward force of -50N. This shows that for every action there must be equal and opposite reaction.. Another example is when you recoil a gun