Important physics test! consider the free-body diagram. based on the net forces illustrated here, what can you say about the acceleration of the object? the object is accelerating in an upward direction. the object is moving at a constant speed. the acceleration equals 0. the object is accelerating down.
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Ответ:
As per given FBD we can see that there are four forces acting on it
now if we consider horizontal forces we can see that
so there is no force along horizontal direction
along Y direction we can see there are two forces one force is 600 N upwards while other is 720 N downwards
So net force on the object will be given as
now overall due to all four forces we can see there is only 120 N net force on the object which is inclined downwards
So here this object will accelerated along the direction of net force
so correct answer will be
The object is accelerating down.
Ответ:
Explanation:
The energy of a photon is given by the Planck relation
E = h f
the speed of light is related to wavelength and frequency
c = λ f
f- c /λ
we substitute
E = h c /λ
let's calculate
E = 6.63 10-34 3 10⁸ / 550 10-9
E = 3.616 10-19 J
let's reduce to eV
E = 3.616 10-19 J (1 eV / 1.6 10-19)
E = 2.26 eV