Answer:
D. 520 N
Explanation:
According to the impulse theorem, the change in momentum of the ball is equal to the impulse exerted on the ball, mathematically:
where
is th change in momentum
F is the average force exerted on the ball
is the time of contact
The change in momentum of the ball is
where
m = 57 g = 0.057 kg is the mass of the ball
u = 45 m/s is the initial velocity
v = -33 m/s is the final velocity (in the opposite direction)
Substituting,
The time of the collision is
Therefore, the average force is
So, the magnitude is approximately 520 N.
The answer is B. As the element X is from group two. This means two electrons can be lost. However nitrogen is from group 5 . You need three more electrons to fill the electron shell. Therefore, you need to find the LCM of 2and 3,which is six. 6over 2 is 3 . Which means you need three element X
Is there options?
If not, examples OF mass transportation would be planes, buses, trains, etc...
so things that aren't mass transportation would be like automobiles, bikes, etc...
Solids have very small intermolecular space and when heated, do not expand as per the container volume. Basically, their expansion is not good.
Liquids, on the other hand, have a definite volume and their expansion is ideal. Also, they fill the container only to the desired level, unlike gases.
Answer:
0.000314 Am²
6.049*10^-7 T
Explanation:
A
From the definitions of magnetic dipole moment, we can establish that
= , where
= the magnetic dipole moment in itself
= Current, 100 A
= Area, πr² (r = diameter divided by 2). Converting to m², we have 0.000001 m²
On solving, we have
= ,
= 100 * 3.14 * 0.000001
= 0.000314 Am²
B
=
(0)/4
* 2
/
³, where
(0) = constant of permeability = 1.256*10^-6
z = 4.7 cm = 0.047 m
B = 1.256*10^-6 / 4*3.142 * [2 * 0.000314/0.047³]
B = 1*10^-7 * 0.000628/1.038*10^-4
B = 1*10^-7 * 6.049
B = 6.049*10^-7 T