Why do teachers give such hard questions? anyways hopefully your question will get answered! (btw i also need the points but yeah gl!!!)
Answer:
0.80 c
Explanation:
The computation of speed is shown below:-
Here, The speed of the captain ship A report for speed of the ship B which is

where
indicates the speed of the ship A
indicates the speed of the ship B
and
C indicates the velocity of life
now we will Substitute 0.40c for A and 0.60 for B in the equation which is

after solving the above equation we will get
0.80 c
So, The correct answer is 0.80c
All elements are balanced. There are 1 Mg, 1 O, 2 Li's and 2 Cl's.
Answer:
1.02453 Am²
0.36834 m
Explanation:
N = Number of turns = 580
d = Diameter = 2.1 cm
r = Radius = 
A = Area = 
I = Current = 5.1 A
B = Magnetic field = 4.1 μT
x = Distance
= Vacuum permeability = 
Magnetic dipole moment is given by

The magnitude of the magnetic dipole moment of this device is 1.02453 Am²
Magnetic field is given by

The axial distance is 0.36834 m
The equivalent of Newton's second law for rotational objects is given by:

where

is the net torque acting on the object

is its moment of inertia

is its angular acceleration
For a hoop rotating around its perpendicular axis, the moment of inertia is

where m is the mass and r the radius. By using the data of the wheel, m=0.750 kg and r=33.0 cm=0.33 m, we find

and since the torque is

, the angular acceleration of the wheel is