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muminat
3 years ago
14

1. A pulley system has efficiency 60%. Calculate mechanical advantage to make its velocity ratio 6 .How much amount of effort is

required to lift 3000 N load by using this pulley system?​

Physics
1 answer:
lesya [120]3 years ago
8 0

Efficiency = Mechanical advantage / Velocity Ratio:

0.60 = M.A./6

MA = 0.6 * 6 = 3.6

The mechanical advantage is 3.6

Mechanical advantage = Force out / Force in

3.6 = 3000/ Force in

Force in = 3000/3.6

Force in = 833.33 N

Answer: 833.33N

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Anakin Skywalker's pod racer has a mass of 450 kg. If the top speed of this racer is 947
andriy [413]

Answer:

15,569,653.3 Joules(J)

Explanation:

The equation used to find Kinetic Energy (KE) is

KE = \frac{1}{2} m v^{2}

You have been given

m = 450kg

v = 947km/h

KE = ???

Firstly, we need to convert the km/h into m/s as this is the unit used in the KE equation

This can be done by dividing by 3.6

947km/h = 263.056m/s

Substitute you values into the equation

KE = \frac{1}{2} m v^{2}

KE = \frac{1}{2} * 450 * 263.056^{2}

KE = 15,569,653.3 Joules(J)

Round your answer as appropriate

3 0
3 years ago
The wavelength range of colors visible to humans ranges from 350 nm to 750 nm. light that most of us perceive as ________ is at
rodikova [14]
The sentence can be completed as follows:
"<span>The wavelength range of colors visible to humans ranges from 350 nm to 750 nm. light that most of us perceive as red is at 750 nm."

In fact, each different color is associated to a different sub-range of this range of wavelengths. Approximately, they are:
- violet: 350-450 nm
- blue: 450-495 nm
- green: 495-570 nm
- yellow: 570-590 nm
- orange: 590-620 nm
- red: 620-750 nm</span>
8 0
3 years ago
Why do you think the cup that is exposed to more air has water outside it?
mylen [45]
It's called condensation. That is what that wetness on the outside of the cup is.
6 0
3 years ago
What might be an example of Newton’s First, Second, and Third Law of Motion
ch4aika [34]

First law: A ball is stationary on the ground. It doesn't want to move, but eventually a person will come and kick it.

Second law: A car will never be constant it will have to stop then go . Objects take time to accelerate and also take time to decelerate.

Third law: If your sitting on a chair at a table, and you want to go, what do you do? Push against the table. The table will push back at you and hence, your chair moves. If this law wouldn't work then you would have to move the chair manually.

7 0
3 years ago
A family uses an electric frying pan with a power rating of 1.2 X 10^3 W. Although the pan is thermostatically controlled, its e
kirill115 [55]

Answer:

378 KWh

Explanation:

We'll begin by converting 1.2×10³ W to KW. This can be obtained as follow:

10³ W = 1 KW

Therefore,

1.2×10³ W = 1.2×10³ W × 1 KW / 10³ W

1.2×10³ W = 1.2 KW

Next, we shall convert 6.3×10² mins to hours (h). This can be obtained as follow:

60 mins = 1 h

Therefore,

6.3×10² mins = 6.3×10² mins × 1 h / 60 mins

6.3×10² mins = 10.5 h

Finally, we shall determine the electrical energy in KWh used for 1 month (i.e 30 days). This can be obtained as follow:

Power (P) = 1.2 KW

Time (t) for 1 month (30 days) = 10.5 h × 30

= 315 h

Energy (E) =?

E = Pt

E = 1.2 × 315

E = 378 KWh

Thus, the electrical energy used for 1 month (i.e 30 days) is 378 KWh.

8 0
3 years ago
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