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yanalaym [24]
3 years ago
10

By using a machine an effort of ten newtons moved through a distance of 14metres to raise a load of 180N to height of 5metres. H

ow many times has the machine made work easier?

Physics
1 answer:
kumpel [21]3 years ago
5 0

Answer: 6.4 times.

Explanation:

First, remember the definition of work as:

W = F*d

where W is work, F is force and d is distance.

The work applied when using the machine is:

W = 10N*14m = 140J

The work that you would apply if you did not use the machine is:

W' = 180N*5m = 900J.

The ratio W'/W is = 900J/140J = 6.4

This means that the machine has made 6.4 times the work easier. (you needed 6.4 times less work to do the task

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stiv31 [10]

Answer:300 joules

Explanation:The formula for specific heat is:

E

=

m

c

θ

, where:

E

is the energy needed in joules,

m

is the mass in kilograms,

c

is the specific heat,

θ

is the change in temperature, Celsius of Kelvin doesn't matter.

Here,

m

=

0.125

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c

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480

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∘

C

θ

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∘

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, and inputting:

E

=

0.125

⋅

480

⋅

5

E

=

300

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4 0
4 years ago
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Aneli [31]
When the direction of the current changes
3 0
3 years ago
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A foot is 12 inches and a mile is 5280I ft exactly. A centimeter is exactly 0.01m or mm. Sammy is 5 feet and 5.3tall. what is Sa
julia-pushkina [17]

Answer:

65.3 Inches tall

Explanation:

If Sammy is 5 feet and 5.3 inches tall, we simply need to convert the feet to inches, and sum the remaining inches from his height to determine his overall height in inches.

So, 5 feet = (12 inches/1foot) * (5 feet) = 60 inches

And 60 inches + 5.3 inches = 65.3 inches.

Hence, Sammy is 65.3 inches tall.

Cheers.

4 0
3 years ago
Which would hit the ground first watermelon or apple
muminat

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3 0
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Define the terms "Calorie" and "Joule"​
Paraphin [41]

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A calorie is defined as the amount of energy needed to raise the temperature of one gram of water one degree Celsius.

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The other unit used to measure heat is the joule. The joule is the SI (System International) unit

5 0
3 years ago
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