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3 years ago

1) A crane uses an average force of 5,200 N to lift a girder 25 m. How much work does the crane do on the girder?

Physics

1 answer:

Andrej [43]3 years ago

8 0

Answer:

1) 130, 000 J

2) 1 J

Explanation:

Work done is product of force in Newtons and distance in meters

W=Fd

Given an average force of 5,200 N and distance of 25 m then we evaluate that

Work done=5200*25=130, 000 Nm or Joules

Similarly, for the second question, given force of 1N and distace of 1 m then the work done will be

W=1*1=1 J

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Contact [7]

Explanation:

The given data is as follows.

Magnetic field strength (B) = 0.65 T

Speed (v) = 2.3 m/s

Induced emf (E) = ?

Formula for emf induced at the ends of the rod of length L which is moving with a speed of v is as follows.

E = BvL

Putting the given values into the formula as follows.

$E_{1} = BvL$

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= 1.495 L .............. (1)

When magnetic field is changed to $B_{2}$ = 0.48 T

Now, we assume that the speed be $v_{2}$ to get the emf $E_{2} = E_{1}$ .

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3 years ago

What is the formula for acceleration.

Trava [24]

The formula for acceleration, or average acceleration, is a=(vf-vi) divided by (tf-ti) .
a= Acceleration (or average acceleration
vf= Final Velocity
vi= Initial Velocity
tf= Final Time
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3 years ago

Answer ?

morpeh [17]

Answer:

2.75 m/s^2

Explanation:

The airplane's acceleration on the runway was 2.75 m/s^2

We can find the acceleration by using the equation: a = (v-u)/t

where a is acceleration, v is final velocity, u is initial velocity, and t is time.

In this case, v is 71 m/s, u is 0 m/s, and t is 26.1 s Therefore: a = (71-0)/26.1

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vladimir1956 [14]

Answer:

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The formation of smoke

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There are some indications which can provide the evidence that chemical reaction has occurred.

A change in color of the substance, formation or smoke or bubbles. The formation of the precipitate and in case the substance becomes cloudy.

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3 years ago

A 15.0 m \long copper wire, 2.20 mm in diameter including insulation, is tightly wrapped in a single layer with adjacent coils t

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