What is the coefficient of kinetic friction between the block and surface? mu _K

Question

What is the coefficient of kinetic friction between the block and surface? mu _K = 0.30. mu _K = 0.50. mu _K = 0.70. mu _K = 0.90. The earth's closest distance of approach to the sun (its perihelion on P) is 3.3% less than its furthest distance from the sun (its aphelion or A) during its orbit. What is the ratio of the force on earth from the sun at perihelion compared to the force of the sun on earth at aphelion? F_P/F_A = 0.935. F_P/F_A = 0.967. F_P/F_A = 1.033. F_P/F_A = 1.067. If one Martian year lasts 1.9 earth years, how far is Mars from the sun, expressed in multiples of the earth-to-sun distance, or a.u.? 1.5 a.u. 2.6 a.u. 3.6 a.u. 6.8 a.u. Given that the Martian diameter is 0.53 Times that of earth's and that Mars has a mass 0.11 Times that of earth. What is the gravitational acceleration on the surface of Mars? 0.11 g. 0.38 g. 0.53 g. 2.55 g.

Explanation / Answer

As per the company policy, if a student asks more than one question in one page, then the first complete question is to be answered

Q14. Question is incomplete. The question must have been accompanied by a diagram showing more information.

Q15. Answer is (D):

Let us say, at point A, the distance between earth and sun is = X Km.

Then, at point P, the distance between earth and sun is = (100 - 3.3)% of X Km = 0.967X Km

The force of attraction between any two masses is given by formula: F = (G.Me.Ms)/ (D)2   

where:

G - Constant of universal Gravitation

Me - Mass of earth

Ms - Mass of sun

D - distance between earth and the sun

Now, the force on earth from the sun at point A is given as:

FA = (G.Me.Ms)/X2 ---------------------------------- (1)

The force on earth from the sun at point P is given as:

FP = (G.Me.Ms)/ (0.967X)2   -------------------- (2)

from equation (1) and (2), we have:

FP/FA = (1/0.967)2 = 1.067

Therefore, the correct answer is (D)

Q 16. Correct answer is (A)

Full explanation is not being provided as it is the second question

Q 17. Correct answer is (B)

Full explanation is not being provided as it is the third question

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