Question

answer all please

Problem 1. A block of mass m = 735 g is located on an incline which makes an angle of 40 with the horizontal The friction coefficient between the block and the incline is K = 0.21. The block is released and it is let slide down the incline. (a) Draw a free body diagram and identify all forces acting on the block. Find the acceleration of the block (b) If the block moves d = 0.42 cm down the incline, what is the change of its potential and kinetic energies? How much did the total (potential + kinetic) energy change? (c) Find the work done by the friction force, how it is related to the change of the complete energy found above? a = 400 Figure 1: Schematic graph for Problem 1 Problem 2 (a) Calculate the magnitude of the gravitational force on a watermelon of mass m = 1.675 g on the surface of the Earth due to the Earth and the Sun. The mass of the Earth is 5.97 - 10 kg and its radius is 3.958.8 mi (1 mi = 1.61 km). The distance between the Earth and the Sun (their centers) is 91.5 million mi and the mass of the Sun is 1.99.100 kg. (6) A neutron star is the collapsed core of a giant star of radius 6.2 mi, which before collapse had a total mass up to 29 solar masses. Find the density of this neutron star and the free fall acceleration at its surface. What is the distance between this star and the Earth if their gravitational attraction force is 39.42 mN (milli Newton). (c) Two planets with masses M and M, are located at a distance D from each other in the outer space. A satellite is located at a distance from planet M. Please find the value of if the gravitational force from planet M is r times larger compared to that from the planet M2. F = F2 *

Answer 1

N. 1(a): Can N= mg coso 1) OImgsino - f = ma-(2) f. - HKN - (3) of a=gsino-ux g coso am 8 m/s? .. 1 (6) v2 = 42 tã5 x2 + 12 = 2(5)(0.42x10?) of v = 0.2 mos. U= mod sino = - Wgravity AU = (0.735)(10)(0.242x16 ) sinyoº ou = 0.02 J • AK = { mCuz-u2) = 4(0.735)(0.2)? AK = 0.015 J 1(C) Wfriction = • F.= f d cos (180°) oly W = Mmg cos Oxd = 0.005 J CS Sched AU + AK =-Wfriction CamScanner

Please ask problem 2 separately.