Answer:
the initial velocity of bullet is u = 330.335 m /s
Explanation:
given,
mass of bullet(m) = 7 g
Mass of pendulum ( M ) = 1.5- kg
The bullet emerges from the block with a speed (V) = 200 m/s
The maximum height ( h ) = 12 cm.
Let the initial speed of the bullet be ' u '
Apply, Law of conservation of momentum :
m u = ( m + M ) V ...............................(1)
Apply, Law of conservation of Energy :
...............(2)
From equation (1) and equation (2) , we have
But V = √2gh
u = 330.335 m /s
hence, the initial velocity of bullet is u = 330.335 m /s
Answer:
d.) Marbles 1 and 2 repel each other, but no interaction occurs with marble
Explanation:
Rubbing the glass against the silk charges the glass positively.
Assuming polarization is ignored,
●Glass won't conduct electrical charge. Therefore, acting as a insulator.
●neutral objects won't distribute it's charge when affected by charge objects in proximity. Therefore, over the marble surface, the charge remain spherically symmetrical (undisturbed)
Marble 1 is positive
Marble 2 is positive
Since marble 1 and 2 are positive, repulsion will occur.
marble 3 is neutral (still assuming polarization is ignored), therefore, no interaction with marble 1 and 2
D is the answer.
This is the answer: Fossil's found in Susan's yard are from prehistoric times.
M/s, km/h, and mph are all used to measure these quantities
