Answer:
3.67 rad/s
Explanation:
L = Length of meter stick = 1 m
r = Distance at which the bullet will hit the stick =
m = Mass of bullet = 3 g
M = Mass of stick = 270 g
= Velocity of bullet = 250 m/s
= Velocity of bullet leaving = 140 m/s
Initial angular momentum
Final angular momentum of the system
Since, angular momentum is conserved we have
The angular speed is the stick spinning after the collision is 3.67 rad/s
Answer:
W = 30 N
Explanation:
Applying the summation of torques about the wedge for equilibrium, taking the clockwise direction as negative. Since the ruler is balanced horizontally about the wedge. Therefore, the summation of all torques acting about the wedge must be equal to zero.
<u>W = 30 N</u>
Answer:
Explanation:
There are a couple of assumptions I had to make here and also a couple of rules based on what I use in my classroom when I teach the Law of Momentum Conservation. First of all, I am going to call the 8kg ball 1 and say that it is moving to the right (and right is positive), and that means that the 3kg ball is ball 2 and say that it is moving to the left (and left is negative). I had to assume that the 2 balls were moving towards each other; hence, the different signs assigned to their movement. I also added in another significant digit since we have only 1 in most of these values and adding in a .0 is not going to change the value of any number. The Law of Momentum Conservation in this particular instance says
which is the mathematical way of saying that the momentum after the collision is the same as the momentum before it. Filling in:
and doing the math here simplifies to
32 - 42 = -16 + 3.0v and
-10 = -16 + 3.0v and
6.0 = 3.0v so
v = 2.0 (and the positive indicates that ball 2 is now moving to the right)
Answer:
A temporary charge
Explanation:
Static electricity is not steady. Unlike current electricity, it does not have a driving force either in the form of a voltage source or an electromotive force from a cell or a generator. Static electricity is usually due a temporary flow of charges between bodies due unbalanced charges within a system, continuing until equilibrium is achieved.
Answer:
Part a)
Part b)
Explanation:
Part a)
Change in potential energy of a charge is given as
here we know that
for proton
also we have
now we have
Part b)
Change in potential energy of a charge is given as
here we know that
for proton
also we have
now we have