Answer:
B
Explanation:
there must not be any heat transfer
Answer:
This is because white light consists of 7 colours with different angles o deviation or retraction.
Explanation:
When a narrow beam of light is refracted by a prism the light spreads into a band of colours (called the spectrum of light )
But in this case if a blue colour is observed it is due to the angle of refraction ,for instance red is refracted the least and hence is seen
S.I. Unit of mass is Kilogram which is denoted by Kg
In short, Your Answer would be Option C
Hope this helps!
Answer:
(a) 2.23 m/s
(b) 0.9 m
Explanation:
h = 1 m, t = 0.1 second
horizontal component of initial velocity, ux = 2 m/s
vertical component of initial velocity, uy = 0
(a) Let v be the velocity after 0.1 seconds. Its vertical component is vy and horizontal component is vx.
The horizontal component of velocity remains constant as in this direction, acceleration is zero.
vx = ux = 2 m/s
Use first equation of motion in Y axis direction.
vy = uy + g t
vy = 0 + 9.8 x 0.1 = 0.98 m/s
Resultant velocity after 0.1 second
v^2 = vx^2 + vy^2
v^2 = 2^2 + 0.98^2
v = 2.23 m/s
(b) Let it takes time t to land.
Use second equation of motion along Y axis
h = uy t + 1/2 g t^2
1 = 0 + 1/2 x 9.8 x t^2
t = 0.45 second
Let it lan at a distance x.
so, x = ux x t
x = 2 x 0.45 = 0.9 m
