of static and kinetic friction between a 3.0-kg box and a horizontal desktop is
ID: 1783721 • Letter: O
Question
of static and kinetic friction between a 3.0-kg box and a horizontal desktop is applied tely. What is the force of friction on the box when a 15-N horizontal are 0.40 and 0.30, respectively 8.8N CISN D) 6.0N B)4.5 N of weight W is in freefall close to the surface of Earth. The magnitude of the force that the object exerts on Earth is A) greater than W B) less than W. C) equal to W. D) zero. E) cannot be determined without knowing the relative masses of the object and the earth. t their closest approach, Venus and Earth are 4.20 x 1010 m apart. The mass of Venus is mass of Earth is 5.97 x 1024 kg, and G-6.67 x 10-1I N m2/kg2. What is 4.87 x 1024 kg, the the ma A) 1.10 x 1018 N B) 4.62 x 1028 N C) 5.43 x 1026 N D) 6.30 × 1020 N E) 1.72 x 1019N gnitude of the gravitational force exerted by Venus on Earth at that point?Explanation / Answer
3)
Static friction force = 0.4*3*9.8 = 11.76 N
15 N > static friction Force
Force of friction = 0.3*3*9.8 = 8.82 N
4)
Equal to W
5)
Gravitational force = Gm1m2/r^2
F = 6.67*10^(-11)*4.87*10^24*5.97*10^24/(4.2*10^10)^2
F = 1.099*10^18 N
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