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Lapatulllka [165]
2 years ago
9

In a single movable pulley, a load of 500 N is lifted by applying 300 N effort. Calculate MA, VR and efficiency.​

Physics
1 answer:
galben [10]2 years ago
6 0

Answer:

in pulley there are different kinds.but the most common one are fixed,moveable and compound pulley. in this question we asked about movable pulley.

Explanation:

Given request solutions

L=500N a,M.A=? a,M.A=L/E =5/3

E=300N b,V.R=? b,V.R=2

c,efficiency =? c,£=M.A/V.R=5/6

£=IS NOT THE REAL SYMBOLS OF EFFICIENCY BUT I IS LOOK LIKE THIS

I THINK I HELPED

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1. On the planet Microid, trains that run on air tracks much like the air track you used in lab are the principle means of trans
Sedaia [141]

Answer:

a) the mass of the second car = 28000 kg

b) the amount of kinetic energy that was lost in the collision = 246.9*10^3 \ J

Explanation:

Given that:

mass of the train car m_1 = 6300 kg

speed of the train car v_1 = 12.0 m/s

mass of the second moving car m_2 = ???

speed of the second moving car v_2 = 2.2 m/s

After strike;

they both move with a speed v_f = 4.00 m/s

a)

Using the conservation of momentum :

m_1v_1+m_2v_2 = (m_1 + m_2)v_f

(6300*12)+m_2(2.2) = (6300 + m_2)4

(75600)+m_2(2.2) = 25200 + 4m_2

75600 - 25200  = 4m_2 -2.2m_2

50400 = 1.8m_2

m_2 = \frac{50400}{1.8}

m_2 = 28000 \ kg

b)

To determine the amount of kinetic energy that was lost in the collision;

we will need to find the difference between the kinetic energy before the collision and after the collision;

i.e

K.E _{lost} = K.E_{i} - K.E _{f}

K.E_{i}  =  \frac{1}{2} m_1v_1^2 + \frac{1}{2}m_2v_2^2

K.E_{i}  =  \frac{1}{2} (6300)(12)^2 + \frac{1}{2}(28000)(2.2)^2

K.E_{i}  =  521360 \ J

K.E_{f}  = \frac{1}{2}(m_1 + m_2 ) v_f ^2

K.E_{f}  = \frac{1}{2}(6300 + 28000 ) (4)^2

K.E_{f}  =274400 \ J

Now;  the  kinetic energy that was lost in the collision is calculated as follows:

K.E _{lost} = K.E_{i} - K.E _{f}

K.E_{lost} = (521360-274400) \ J

K.E_{lost} =246960 \ J

K.E_{lost} =246.9 * 10 ^3 \ J

7 0
3 years ago
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