Answer:
Explanation:
The relation between momentum "P" and impulse "I " is given by the impulse momentum theorem given below,
i.e. impulse is equal to change in momentum.
I= ∆P= P₂ - P₁
F∆t=mv₂ - mv₁
here m is the mass of skateboarder= m= 53.6 kg
initial velocity v₁ = 4.45m/s
final velocity v₂ = 0
now impulse is
I =0 - 53.6 x 4.45 = -235.52 kgm/s
here the final momentum is zero as the final velocity is zero and the initial momentum P₁= mv₁ = 235.52kgm/s
now the strong force that is applied for 1.82 seconds can be calculated as
F= - I / t
F = - 235.52/ 1.82 = - 131 N
in second step the weak force that is applied for 5.34 s can be calculated as
F = - I / t = - 235.52 / 5.34 = - 44.6 N
the negative sign of impulse and applied force indicates that the force is opposite to the direction of motion of the skateboarder.
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Answer:
the thickness of the dam should be the same if the level of water does not change.
Explanation:
the thickness of dam depends on the pressure of water that has to withstand.
Since the pressure exerted by the water depends only on the depth of the lake and not the length of the lake
P =1/2 *ρ*g*h ,
where P= pressure exerted by the water on the dam, ρ= density of water , g= gravity , h= depth of the lake
Then if the lake were smaller and the depth remains the same, the thickness of the dam should be the same
Pressure and heat. I hope this helps
Answer:
Net force on electron will be 
Explanation:
We have given that the orbit 
Speed of the electron 
Mass of the electron is given as 
Centripetal acceleration is given by 
Force is given by F = ma
So force 
