I think the answer is A.
Hope this helps :)
The third force C is in the opposite direction of the sum of the first two forces, A+B, but the magnitude is the same as A+B
Since A & B are at right angles we can just use Pythagoras and trig:
A+B magnitude = sqrt(6^2 + 3^2) = 6.71
A+B angle = arctan(6/3) deg north of east = 63.4 deg (first quadrant)
So C magnitude = 6.71 (same as A+B)
[C angle = 63.4 deg south of west (third quadrant) = -180+63.4 deg polar = -116.6 deg
The work is being done in following cases:
A mover carries a box up a flight of stairs.
A mover carries a box across a room.
Wind blows a pool chair across the yard.
A weightlifter lifts a barbell off the ground.
These are the only cases in which work is being done. The Formula of Work is:
Work= Force applied x Distance moved.
In all of these cases force is being applied and the object on which the force is being applied move in a horizontal or Vertical direction. Thus Work is done !
Answer:

Explanation:
When wings of the airplane makes an angle of 40 degree with the horizontal so here we can say that force due to air is having two components


now we know that


also we know that


now plug in all data in above equations




Answer:
Danny hits the water with kinetic energy of 5000 J.
Explanation:
Given that,
The Weight of Danny Diver,
F = 500 N
m*g= 500 N
He steps off a diving board 10 m above the water.
h=10 m
when Danny diver hits water he generates the kinetic energy.
We need to find the kinetic energy of the water.
Let kinetic energy is K.
K = m*g*h
Where g is acceleration due to gravity.
that g= 9.8 m/s^2
now substituting the values in above equation
K= (500) * 10
K= 5000 J
Hence,
he hits the water with kinetic energy of 5000 J.
Learn more about Kinetic energy here:
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