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yuradex [85]
3 years ago
7

A 10-kg block is suspended in air by a single string that passes through a pulley and is attached on the other side to a 35-kg b

lock that is on the verge of sliding on the ground. What is the coefficient of static friction between the larger block and the ground? (Note: The magnitude of the vertical force the small block exerts on the large block is 87 N.)
Physics
1 answer:
s2008m [1.1K]3 years ago
4 0

Answer:

0.286

Explanation:

Let g = 10m/s2, and assume the pulley is frictionless, the weight by the 10kg block would exert a force on the 35kg block on the ground

Weight of the 10 kg-block = mg = 10 * 10 = 100 N

This force is balanced by static friction force from the ground due to the normal force of the 35kg block. So the friction force would also be 100N

The weight and normal force of the 35kg block is N = Mg = 35*10 = 350 N

The coefficient of the friction force if friction force divided by normal force:

\mu = \frac{F_f}{N} = \frac{100}{350} = 0.286

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x = v₀t + 0.5at²

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2. v₀ = 0; v = 60 km/h; t=5.4 s 
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    2(3.09 m/s²)x = [60 km/h*(1000 m/1km)*(1 h/3600 s)]² - (0 m/s)²
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4. Using acceleration in #2 and v₀ = 0, the time would be
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   x = v₀t + 0.5at²
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3 years ago
John traveled East at 10 m/s for ten
NNADVOKAT [17]

Answer:

Option D

130 m

Explanation:

From the concept of speed, distance=speed*time

When traveling East, displacement=10*10=100 m (since he takes 10 seconds while traveling at a speed of 10 m/s)

When traveling West, displacement=5*6=30 m (since John takes 6 seconds to travel at a speed of 5 m/s)

Total displacement=Displacement East+ Displacement West=100+30=130 m

5 0
4 years ago
2 equal charges, 27 micro Coulomb each, are separated by 5 cm. Find force between those.
padilas [110]

Answer:

The force between charges is  F= 2.624*10^3N.

Explanation:

The Coulomb force F between the two charges q_1 and q_2 separated by distance d is given by the equation

F = k\dfrac{q_1q_2}{d^2}

where k is the coulombs constant, and has the value

k= 9*10^9N\cdot C\cdot m^2.

Now in our case

q_1=q_2=27\mu C =27*10^{-6}C

and

d= 5cm =0.05m,

therefore, the Coulomb force between the charges is

F =( 9*10^9N\cdot C\cdot m^2)*\dfrac{(27*10^{-6}C)(27*10^{-6}C)}{(0.05m)^2}

\boxed{ F= 2.624*10^3N}

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Sedaia [141]

Answer:

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The condition for constructive interference is

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Therefore we simply applied the above formula to determine the minimum coating thickness

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3 years ago
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ASHA 777 [7]

Explanation:

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Distance covered by the runner, d = 26.220 mile

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v=\dfrac{d}{t}

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t = 2.75 hours

Since, 1 hour = 60 minutes

t = 165 minutes

Since, 1 minute = 60 seconds

t = 9900 seconds

Hence, this is the required solution.

7 0
3 years ago
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