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Arisa [49]
4 years ago
9

A bucket of water is whirled in a circle in a vertical plane. The radius of the circle is 0.85 m. What is the minimum speed that

will just prevent the water from falling out of the bucket when it is upside down at the top of the circle?
Physics
1 answer:
-BARSIC- [3]4 years ago
4 0

Answer:

v=2.88 m/s

Explanation:

Given that

R= 0.85 m

The minimum speed of the bucket to prevent the water from falling out given as

v=\sqrt{Rg}

Where

R=Radius of the circular arc

g=Acceleration due to gravity

We are taking g= 9.81 m/s²

Now by putting the values

v=\sqrt{Rg}

v=\sqrt{0.85\times 9.81}\ m/s

v=2.88 m/s

Therefore the speed of the bucket should be 2.88 m/s.

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A sport car starts from rest with an acceleration of 12 m/s2 . Calculate its final velocity after 7 s.
miv72 [106K]

Answer:

Final velocity= 84 m/s

Explanation:

V final= V initial + a * t

Vf = 0+ 12 (7)

Vf= 84 m/s

4 0
3 years ago
A merry-go-round with a rotational inertia of 600 kg m2 and a radius of 3.0 m is initially at rest. A 20 kg boy approaches the m
nekit [7.7K]

Answer:

The velocity of the merry-go-round after the boy hops on the merry-go-round is 1.5 m/s

Explanation:

The rotational inertia of the merry-go-round = 600 kg·m²

The radius of the merry-go-round = 3.0 m

The mass of the boy = 20 kg

The speed with which the boy approaches the merry-go-round = 5.0 m/s

F_T \cdot r = I \cdot \alpha  = m \cdot r^2  \cdot \alpha

Where;

F_T = The tangential force

I =  The rotational inertia

m = The mass

α = The angular acceleration

r = The radius of the merry-go-round

For the merry go round, we have;

I_m \cdot \alpha_m  = I_m \cdot \dfrac{v_m}{r \cdot t}

I_m = The rotational inertia of the merry-go-round

\alpha _m = The angular acceleration of the merry-go-round

v _m = The linear velocity of the merry-go-round

t = The time of motion

For the boy, we have;

I_b \cdot \alpha_b  = m_b \cdot r^2  \cdot \dfrac{v_b}{r \cdot t}

Where;

I_b = The rotational inertia of the boy

\alpha _b = The angular acceleration of the boy

v _b = The linear velocity of the boy

t = The time of motion

When the boy jumps on the merry-go-round, we have;

I_m \cdot \dfrac{v_m}{r \cdot t} = m_b \cdot r^2  \cdot \dfrac{v_b}{r \cdot t}

Which gives;

v_m = \dfrac{m_b \cdot r^2  \cdot \dfrac{v_b}{r \cdot t} \cdot r \cdot t}{I_m} = \dfrac{m_b \cdot r^2  \cdot v_b}{I_m}

From which we have;

v_m =  \dfrac{20 \times 3^2  \times 5}{600} =  1.5

The velocity of the merry-go-round, v_m, after the boy hops on the merry-go-round = 1.5 m/s.

5 0
3 years ago
((GIVING 40 POINTS AND BRAINLIEST TO CORRECT ANSWER!)) What is shown in the diagram?
NNADVOKAT [17]
Hello!!
The Answer is A! Motor.

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5 0
3 years ago
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an ocean wave has a wavelength of 16 meters and a frequency of 0.31 waves per second. what is the spend of the wave
Svet_ta [14]

Answer:

51.1 is the answer

Explanation:

7 0
2 years ago
А geostationary satellite moves in an orbit of radius 6300km. Calculate the speed with which it moves in the orbit [π=22÷7]​
azamat

Answer:

15.3 m/s

Explanation:

Radius of orbit= 6400+6300 = 12700 km

Circumference of orbit= 2*(22/7)*12700 =79796.45*10^3 m

Now,

       Speed= Distance / Time

                  = 79796.45*10^3/(24*60*3600)

                  = 15.3 m/s

4 0
3 years ago
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