Answer:
Part a)
Part b)
Explanation:
Part a)
Torque on the rod is due to two forces
(i) Due to weight of the rod at mid point
(ii) Due to external force applied at the end
Now we have
Part b)
As per Newton's law we know that
now we have
Answer:
A. Ar, Si, Mg, Na
Explanation:
ar is argon which is an inert gas. its in group 18. whole column is filled with inert gases.
na is sodium. very reactive. its in group 1. whole column is filled with very reactive elements
Answer:
the answers are the first and last option
see
below
Explanation:
refractive index = speed of light in vacuum / speed of light in medium
light travels at a speed of 3.0 x 10^8 m/s in vacuum
refractive index = 3.0 x 10^8 / 2.0 x 10^8
refractive index = 1.5
hope this helps, please mark it
Answer:
25.2 cm
Explanation:
K = 1050 N/m
m = 1.95 kg
h = 1.75 m
By the conservation of energy, the potential energy of the block is converted into the potential energy stored in the spring
m g h = 1/2 x k x y^2
Where, y be the distance by which the spring is compressed.
1.95 x 9.8 x 1.75 = 1/2 x 1050 x y^2
33.44 = 525 x y^2
y = 0.252 m
y = 25.2 cm
