A) same magnitude in opposite directions
40 N (Newton's third law<span> i: For every action, there is an equal and opposite reactio.)</span>
Answer:
The wavelength will be "1.182 μm".
Explanation:
The given values are:
Wavelength

or,

Distance,


Distance of fringe from center,

We have to find the wavelength of first order dark fringe,

As we know,
⇒ 
On putting the given values in the formula, we get
On applying the cross multiplication, we get


or,
Answer:
d. the coefficient of static friction is greater than the coefficient of kinetic friction.
Explanation:
The magnitude of the for required to be applied to the carton is given as equal to the frictional force of between the carton and the surface. So, when the carton is at rest:
F = μs*W
and when the carton is in motion:
F = μk*W
where,
F = Force Required
μs = coefficient of static friction
μk = coefficient of kinetic friction
W = Weight of Carton
Since, the weight is constant. Therefore, for the increase in the force required to move the carton at rest than the force required to keep pushing the carton in velocity, the coefficient of static friction must be greater than the coefficient of kinetic friction. Therefore, the correct option is:
<u>d. the coefficient of static friction is greater than the coefficient of kinetic friction.</u>