The distance covered as the crane does work is 76 m.
Recall that the work done in lifting the crane is the product of force and distance covered. In this case, we are talking about the distance through which the crane is raised. Therefore;
Work done = Fs
F = Force applied
s = Distance covered
Substituting values;
Work done/Force applied = Distance covered
Distance covered = 9,500 J/125 N
Distance covered = 76 m
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Answer:
Bc the ocean is blue and the water reflects to the sky ;-;
Answer:
4.96 eV
Explanation:
Recall the Einstein photoeletric equation;
KE = E - Wo
Where;
KE = kinetic energy of the ejected photoelectron
E= energy of the incident photon
Wo = Work function
But
KE = eV= 1.6 * 10^-19 C * 7 V /1.6 * 10^-19 C = 7 eV
E = hf/e = 6.6 * 10^-34 * 2.9 ✕ 10^15 Hz/1.6 * 10^-19
E = 11.96 eV
Hence;
Wo = E - KE
Wo = 11.96 eV - 7eV
Wo = 4.96 eV
<span>Required"mu" is given by:
mu*0.5*9.8*1 = 0.5*100*0.20^2 or
mu = 4/9.8 = 0.408 or 0.41
Therefore, </span><span> the coefficient of friction between the block and the tabletop is 0.408 or rounded off to 0.41.
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Answer:
See attached handwritten document for answer
Explanation: