A 0.01 kg bullet has a speed of 700m/s before it strikes a 0.95 kg wooden block that is stationary on a horizontal frictionless
1 answer:
The final speed is 7.29 m/s
Explanation:
We can solve the problem by using the law of conservation of momentum: in fact, the total momentum of the bullet-block system must be conserved before and after the collision. Therefore, we can write:
where:
m = 0.01 kg is the mass of the bullet
u = 700 m/s is the initial velocity of the bullet
M = 0.95 kg is the mass of the block
v is the final combined velocity of bullet+block
Solving the equation for v, we find the final speed:
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Answer:
The new self inductance is 3 times of the initial self inductance.
Explanation:
The self inductance of a solenoid is given by :
Where
N is number of turns per unit length
A is area of cross section
l is length of solenoid
If length and number of coil turns are both tripled,
l' = 3l and N' = 3N
New self inductance is given by :
So, the new self inductance is 3 times of the initial self inductance.