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qwelly [4]
3 years ago
11

What are the two factors that affect the frictional force between two surfaces​

Physics
1 answer:
Talja [164]3 years ago
6 0

Static friction and normal force? I would Google to double check if I'm right.

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A tennis player strikes a tennis ball from underneath with her racket. The ball is sent straight up with an initial velocity of
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Vf^2=Vo^2+2ax

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Assuming the carbon cycle is a closed system, which of the following statements is true?
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A student weighing 700 N climbs at constant speed to the top of an 8 m vertical rope in 10 s. The average power expended by the
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To solve this problem we will use the concepts related to power, defined as the amount of energy applied over a period of time.

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P = \frac{E}{t}

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3 years ago
An ore sample weighs 17.50 N in air. When the sample
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Answer with Explanation:

We are given that

Weight of an ore sample=17.5 N

Tension in the cord=11.2 N

We have to find the total volume and the density of the sample.

We know that

Tension, T=W-F_b

F_b=buoyancy force

T=Tension force

W=Weight

By using the formula

11.2=17.5-F_b

F_b=17.5-11.2=6.3 N

F_b=V_{object}\times \rho_{water}\cdot g

Where

V_{object}=Volume of object

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g=9.8 ms^{-2}=Acceleration due to gravity

Substitute the values then we get

6.3=9.8\times 1000\times V_{object}

V_{object}=\frac{6.3}{9.8\times 1000}=6.43\times 10^{-4} m^3

Volume of sample=6.43\times 10^{-4} m^3

Density of sample,\rho_{object}=\frac{Mass}{volume_{object}}

Where mass of ore sample=1.79 kg

Substitute the values then, we get

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Density of the sample=2.78\times 10^{3} kgm^{-3}

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