(i) Effective force acting downward
(ii) viscous force acting upward
Since the ball is moving with a constant velocity v there is no acceleration in it, the net force acting on it must be zero. That is
Thus, terminal velocity of the ball is directly proportional to the square of its radius
Q: 22. How will you measure acceleration due to gravity at any place on the earth?
Sol. With the help at a simple pendulum
Q: 23. Derive an expression for the time period of a simple pendulum.
Q: 24. When two infinite parallel wires carrying current in same direction are placed vacuum, then will they experience
Sol. Yes they experience force at attraction
Q: 25. Give the name and formula of that force?
Sol. Force per unit length of wire Lorentz force
Q: 26. A block of mass ‘m’ is placed on the table and another block of mass ‘M’ is hanging from a pulley and these two masses are connected by a string. All surfaces are frictionless. Find acceleration of the system
A=b by string constant
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