A motor and pulley system is used to lift a 30 kg mass 20 m vertically in no more than 10 s. If the efficiency of the motor is 0.98, the minimum input power is ____ W.

Answers

Answer 1

The power input is obtained as 6000 W

What is the power input?

We know that the power is defined as the rate of doing work. The rate has to do with the timed rate thus if we divide the work done by the time taken to do the work, that is how we obtain the the power that is expended.

Now;

We have the work done as = 30 kg * 9.8 m/s^2 * 20 m = 5880 J

Energy expended = 5880 J/ 10 s = 588 W

We know that the efficiency is obtained from;

E = Power output/ Power input * 100/1

0.98 = 588 W/ Power input * 100/1

0.98 = 58800/Power input

Power input = 58800/0.98

Power input =6000 W

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Related Questions

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17. You can place frame-engaging lift adapters anywhere under the vehicle's body, frame, or suspension.
A) O True
B) False
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Answers

You can place frame-engaging lift adapters anywhere under the vehicle's body, frame, or suspension is a true statement.

What are frame engaging lift adapters?

Frame engaging adapters are known to be a kind of tools that are often used for lifting vehicles for examples pickup trucks that are known to have frames.

Note that Frame form of engaging lift adapters is one that a person can put anywhere that is under the vehicle's underbody as there is no need to consult the vehicle manufacturer's manual.

Therefore, based on the above, one can say that a person can place frame-engaging lift adapters anywhere under the vehicle's body, frame, or suspension as a true statement.

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is it necessary to check on the condition of your tools.

Answers

Answer:

yes because then you know wether or not to start prparing for your next tools that you need to get

What are primary reasons for being trained on cleaning, storage, and maintenance of tools and equipment?
O Work safer
O Save money on tools
O Work more efficiently
O All of the above

Answers

All of the above is the answer

all of the above the last one

What type of energy transfers could occur in Biosphere 2?

Answers

Answer:

Biosphere 2 is a 3.15-acre (12,700 m2) structure originally built to be an artificial, materially-closed ecological system in Oracle, Arizona (USA) by Space Biosphere Ventures, a joint venture whose principal officers were John P. Allen, inventor and Executive Director, and Margret Augustine, CEO.

Explanation:

A good scientific question

is specifically focused and tries to answer something unknown.
is generally focused and tries to answer a gap in knowledge.
always has a gap in knowledge.
always leads to a hypothesis.

Answers

Answer:

is generally focused and tries to answer a gap in knowledge

Explanation:

just took test review

Which of the following would promote the isostatic adjustment of the crust resulting in the uplift of some mountains and possibly the formation of new fault lines?

Answers

Weight is a factor that would be known to promote the isostatic adjustment of the crust resulting in the uplift of some mountains and possibly the formation of new fault lines.

What is meant by isostatic adjustment?

This is the term that is used in geography to refer to the ongoing movement of land that once used to be covered by the ice age glaciers.

The isostatic adjustment is known to be the function of the amount of weight that is on the surface of the earth. Now when the weight is less, the crust of the earth would have to rise the more but when it is more, the crust would start to sink.

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alice thought of a number, added 9, divided by 3, subtracted 2, and multiplied by 4 to give an answer of 8. what was her starting number

Answers

Answer:

Explanation:

3+9=12

12÷3=4

4-2=2

2×4=8

The starting number was 3 which Alice thought of as a number, added 9, divided by 3, subtracted 2, and multiplied by 4 to give an answer of 8.

What is the number system?

A number system is defined as a way to represent numbers on the number line using a set of symbols and approaches. These symbols, which are known as digits, are numbered 0 through 9.

Let the starting number would be x

As per the given question,

She did was 4[(x+9)/3 - 2] = 8 which is an equation that we can solve for x,

⇒ 4[(x+9)/3 - 2] = 8

⇒ [(x+9)/3 - 2] = 8/4

⇒ (x+9)/3 - 2 = 2

⇒ (x+9)/3 = 2 + 2

⇒ (x+9)/3 = 4

⇒ (x+9) = 12

⇒ x = 12 - 9

⇒ x = 3

Therefore, the starting number was 3.

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