Answer:
A. Radio waves.
Explanation:
Electromagnetic radiation is defined as the waves (or photons - packets of energy) of the electromagnetic field, propagating through space, carrying electromagnetic radiant energy.
Examples of electromagnetic radiation are : infra red, visible light, ultraviolet light, gamma rays, radio waves etc.
Answer:
Explanation:
Given
inclination
initial speed
Point of release is 45 m above the ground
Considering stone to be a projectile, so time taken by projectile for its zero vertical displacement is
Now after completing zero vertical displacement , stone needs to travel another 45 m in downward direction with initial speed u=20\sin 30
where,
thus total time time required is
vertical velocity just before hitting
Horizontal velocity
Net velocity Just before hitting
Answer:
the angle of incident is 40°
Explanation:
NQ is the normal to the mirror, therefore
angle NQA =90°
PQA = 50°
incident angle = NQA - PQA
90°- 50° = 40°
note that the angle of reflection is equal to the angle of incident
Answer:
Tension upwards
Force downward
Explanation:
Since the weight of the strut is uniform therefore it can be considered as a uniformly distributed load of 400 over a mass-less beam.
According to the given conditions one end of the strut is attached to a hinge and the other is loaded with a sign of 200 N and supported by a cable in the middle of the span of strut as shown in the schematic.
<u>Now, for the equilibrium condition:</u>
Forces are balanced:
i.e.
.....................(1)
Moment about any point is balanced:
<u>Taking moment about the hinge point:</u>
upwards
Now put this value in eq. (1)
i.e. negative sign denotes opposite direction to the presumed one.
downward
draw x,y axes.
x is deg M
y is deg C
0 of deg M = -38.9degC
100 >>> 356.9
draw st line 0,-38.9 to 100,356.9
slope is 3.95
line eq is degC = 3.95xdegM-38.9
set degC to 100. find degM
degM about 35 for boiling water