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yaroslaw [1]
3 years ago
8

If a marble is released from a height of 10 meters, how long would it take for it to hit the ground?

Physics
2 answers:
azamat3 years ago
8 0
Time to reach ground = √2h/g = √2*10/9.8 = √20/9.8 = 1.43 second

Hope it helps!
Dvinal [7]3 years ago
3 0
It would take approximately 1.43 seconds  
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A man wishes to lift a stone weighing 1440 N, using a first-class lever that measures 5 meters. What force should it perform if
Crazy boy [7]

Answer:

3360 N

Explanation:

In a first-class lever, the effort force and load force are on opposite sides of the fulcrum.

The lever is 5 m long.  The load force is 1.50 m from the fulcrum, so the effort force must be 3.50 m from the fulcrum.

The torques are equal:

Fr = Fr

(1440 N) (3.5 m) = F (1.5 m)

F = 3360 N

4 0
3 years ago
True or False: A change of 1 pH unit represents a tenfold change in the<br> acidity of the solution.
alisha [4.7K]

Answer:

I was also going to ask same question edited:ok i found its true

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3 years ago
MAJOR POINTS! Solve the system of equations to find <img src="https://tex.z-dn.net/?f=%20a_%7B2%7D%20%20" id="TexFormula1" title
Monica [59]
You are dealing with pulleys?

can be done with addition of the two equations to eliminate T.

(2^{*}) \quad {} -m_1 g \cos \theta + T = m_1 a _2
+
(4^{*}) \quad 3m_1 g - T = 3m_1 a_2
=

(-m_1 g \cos\theta  +  3m_1 g) + (T - T) = m_1 a _2 + 3m_1 a_2 \implies \\ \\&#10;(-m_1 g \cos\theta  +  3m_1 g) = 4m_1 a_2 \implies \\ \\&#10;m_1(- g \cos\theta  +  3g)= 4m_1 a_2

we can cancel m₁ by dividing both sides by it, assuming mass is not zero


(- g \cos\theta + 3g)= 4a_2 \implies \\ \\&#10;a_2 = \dfrac{- g \cos\theta + 3g}{4} \\ \\&#10;a_2 = \dfrac{- 9.80  \cos 60 + 3(9.80)}{4} \\ \\&#10;a_2 = 6.125 \text{m/s}^2&#10;

a₂ = 6.125 m/s² ( do significant digits if you need to)
6 0
3 years ago
A pendulum is made of a small sphere of mass 0.250 kg attached to a lightweight string 1.20 m in length. As the pendulum swings
olchik [2.2K]

Answer:

0.833 N

Explanation:

Formula for Kinetic Energy E_k = \frac{mv^2}{2}

Formula for Potential Energy E_p = mgy

First we need to find the vertical distance between the maximum-angle position and the pendulum lowest point:

Using the swinging point as the reference, the vertical distance from the maximum-angle (34 degree) position to the swinging point is:

L * cos(34^o) = 1.2cos(34^o) = 1.2*0.83 = 0.995 \approx 1 m

At the lowest position, pendulum is at string length to the swinging point, which is 1.2 m. Therefore, the vertical distance between the maximum-angle position and the pendulum lowest point would be

y = 1.2 - 1 = 0.2 m.

As the pendulum is traveling from the maximum-angle position to the lowest point position, its potential energy would be converted to the kinetic energy.

By law of energy conservation:

E_k = E_p

\frac{mv^2}{2} = mgy

v^2 = 2gy

v = \sqrt{2gy}

Substitute g = 10 m/s^2 and y = 0.2 m:

v = \sqrt{2 * 10 * 0.2} = \sqrt{4} = 2 m/s

At lowest point, pendulum would generate centripetal tension force on the string:

F = m\frac{v^2}{L}

We can substitute mass m = 0.25, rotation radius L = 1.2 m and v = 2 m/s:

F = 0.25\frac{2^2}{1.2} = 0.833 N

5 0
3 years ago
a wagon of mass 42 kg is pushed by a student a distance of 12.2 meters, and 297 j of work was sone on the wagon how much force d
a_sh-v [17]

Answer:

Force=2.484 N

Explanation:

f =  \frac{w}{gh}  \\  =  \frac{297}{9.8 \times 12.2} \\  f = 2.484 \: n

Hope it helped

PLS mark BRAINLIEST

8 0
3 years ago
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