The linear momentum is given by . Here
is mass
is velocity of the body. Given mass and velocities as
Initial momentum is and final momentum is
.
The correct answer is (A)
If a bow holds 500J of potential energy as the arrow is pulled back, how much kinetic energy will the arrow have after it has be
1 answer:
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The correct answer is:
the distance of the orbiting object to Earth.
In fact, we know that the gravitational force that keeps the object in circular motion around the Earth is equal to the centripetal force, so we can write:
If we re-arrange the equation, we find an expression for the tangential speed of the object:
and we see that it depends on 3 quantities: G, M (the mass of the Earth) and r (the distance of the object from the Earth).
Answer:
Number of turns per unit length will be
Explanation:
We have given that strength of the magnetic field produced by the solenoid B = 7 T
Current in the solenoid i = 200 A
Let the number of turns per unit length is n
Magnetic field due to solenoid is given as here
is permeability of free space n is number of turns per unit length and i is current
So