<u>Answer</u>
1) A. 96 Candelas
2) A. Both of these types of lenses have the ability to produce upright images.
3) C. 5 meters
<u>Explanation</u>
Q1
The formula for calculation the luminous intensity is;
Luminous intensity = illuminance × square radius
Lv = Ev × r²
= 6 × 4²
= 6 × 16
= 96 Candelabra
Q2
For converging lenses, an upright image is formed when the object is between the lens and the principal focus while a diverging lens always forms and upright image.
A. Both of these types of lenses have the ability to produce upright images.
Q3
Luminous intensity = illuminance × square radius
square radius = Luminous intensity/ illuminance
r² = 100/4
= 25
r = √25
= 5 m
Answer:
<u>The formula for the energy of motion is KE = .5 × m × v2 </u>
where KE is kinetic energy in joules,
m is mass in kilograms and
v is velocity in meters per second.
Explanation:
So in the above question
m=2.10kg
v=12.2m/s
KE=.5*2.10*(12.2)^2
K.E=.5*2.10*148.84
<u>K.E=156.282 joules</u>
Answer:
1.4584 kg
Explanation:
Time period of a physical pendulum is given by
Here f=0.290 so
Mass =2.40 kg
d=0.300 m
g =9.8 m
So kg-
So the moment of inertia of the pendulum about the pivot point will be 1.4584 kg-
Answer:
B) shrinks
Explanation:
The magnetic force is a force exerted between two magnets, or two magnetic materials, or also on an electric charge moving in a magnetic field.
If we talk about magnetic material, the magnetic field they generates can be represented using a dipole: essentially, they have a north pole (where the lines of the field go out) and a south pole (where the lines of the field go in).
Also, the lines spread apart as we move away from the magnet itself. This means that the strength of the field (and so, the intensity of the force) decreases as we move away from the magnet.
Using this description, we can now understand that when we move the paper clip further from the magnet, the force exerted on the clip decreases, as the magnetic field becomes weaker. So, the correct answer is B.