Answer:
Given:
The distance of the star is,=4.29 ly
We know that one light year is the distance travelled by light in one year.
1 light year = 3×10
8
×365×24×60×60
=94608×10
11
m
Therefore, the distance in 4.29 ly can be written as:
4.29 ly=405868.32×10
11
m
We know that 1 Parsec is also the unit of distance and its value is:
1 parsec=3.08×10
16
m
Now, to express the distance in terms of parsec.
4.29ly=
3.08×10
16
405868.32×10
11
=1.32 parsec
The diameter of the Earth's orbit is,
d=3×10
11
m
The angle made by the star on the Earth's orbit can be given by:
θ=
405868.32×10
11
3×10
11
=7.39×10
−6
rad
But, the angle covered in 1sec=4.85×10
−6
rad
So, the parallax in viewing the star at two different positions of the Earth's orbit:
for, 7.39×10
−6
rad=
4.85×10
−6
7.39×10
−6
=1.52"
Answer:
B) it begins to rotate counterclockwise (as observed from above).
Explanation:
As we know that there is no external torque on the system of wheel + merry go round
so here angular momentum of the system must be conserved
so initially we know that wheel is rotating and merry go round is stationary in counter clockwise direction
Now when we stop the wheel its net angular momentum will be conserved and the system will still continue to move with some angular speed in the same direction
so finally the merry go round must have to rotate in the counter clockwise direction with some angular speed
so correct answer will be
B) it begins to rotate counterclockwise (as observed from above).
Answer:
The true statement among the options is;
d. A real emf device has internal resistance and an ideal emf device does not.
Explanation:
The internal resistance of an ideal emf device is zero to which allows the perfect movement of charges between terminals. This results in the emf of an ideal emf device being equal to the potential difference across the terminals of the device
By definition, an ideal emf device is an emf device with zero internal resistance
There is some level of resistance in a real emf device and the emf of the device is equal to the potential difference across its terminals only if there is no current flowing through it.
Answer: V = 67808m/s
Explanation:
Parameter given
E = 1.63*104V/m
B = 2.50*10-3T
V = E/B
Velocity of the beam of electron = (Electric field/Magnetic field)
V = (1.63*104V/m) ÷ (2.5*10-3T)
= 169.52/ 0.0025
V= 67808m/s
"All elements are made of atoms" is the statement among the following choices given in the question that <span>is not part of Dalton's atomic theory. The correct option among all the options that are given in the question is the first option. I hope that this is the answer that has actually come to your help.</span>
