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viva [34]
3 years ago
5

The following pairs of surfaces are pushed together with the same amount of force. Between which pair of surfaces will friction

be the greatest?
A. two pieces of sandpaper
B. two pieces of waxed paper
C. a painted surface and a piece of sandpaper
D. a painted surface and a piece of waxed paper


Juan and his friends want to build their own go-karts and race down their street. According to Newton’s Second Law of Motion, which of these will help Juan to win the race?
A. increasing the mass of his go-kart
B. increasing the amount of inertia the go-kart has
C. decreasing the net force applied to the go-kart
D. decreasing the mass of his go-kart
Physics
2 answers:
Aleks [24]3 years ago
5 0
A.  The friction between two pieces of sandpaper is greater than
the friction between any of the pairs of surfaces.

D.  Juan should decrease the mass of his go-kart.  Then any force
that pushes it forward will give it greater forward acceleration.
ozzi3 years ago
5 0

c. a painted surface and a piece of sandpaper

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I assume the 100 N force is a pulling force directed up the incline.

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∑ F[para] = 100 N - F[friction] = 0

∑ F[perp] = F[normal] - mg cos(30°) = 0

The friction in this case is the maximum static friction - the block is held at rest by static friction, and a minimum 100 N force is required to get the block to start sliding up the incline.

Then

F[friction] = 100 N

F[normal] = mg cos(30°) = (10 kg) (9.8 m/s²) cos(30°) ≈ 84.9 N

If µ is the coefficient of static friction, then

F[friction] = µ F[normal]

⇒   µ = (100 N) / (84.9 N) ≈ 1.2

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A 5.93 kg ball is attached to the top of a vertical pole with a 2.35 m length of massless string. The ball is struck, causing it
Delvig [45]

Answer

given,

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T cos θ = 58.17

T sin \theta =\dfrac{mv^2}{r}

T sin \theta =\dfrac{5.93\times 4.75^2}{2.35 sin \theta}

T sin^2 \theta =56.93

sin^2 \theta = 1 - cos^2 \theta

T (1 - cos^2 \theta) =56.93

T (1 - (\dfrac{58.17}{T})^2) =56.93

T² - 56.93T - 3383.75 = 0

T =  93.22 N

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2 years ago
EASY BRAINLIEST PLEASE HELP!!
Rudiy27

Answer:

I think the awnser is B (but don't qoute me on that)   if its right then yay but if its wrong im sorry

Explanation:

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