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3 years ago

14

A forward horizontal force of 3 lb is used to pull a 60 lb sled at constant velocity on a frozen pond. the coefficent of (kineti

c) friction is:
1. 0.2
2. 0.05
3. 0.5
4. 20
5. 2

1 answer:

puteri [66]3 years ago

7 0

It’s either 0.05 or 20. Assuming that the coefficient friction is a damping factor, I feel like 0.05 would be correct m

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The boom of a fire truck raises a fireman (and his equipment – total weight 280 lbf) 60 ft into the air to fight a building fire

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Answer:

a)Work done by fireman= 2.15 Btu

b) Time t= 0.86 sec

Explanation:

Given that

Weight = 280 lbf

We know that 1 lbf = 4.44 N

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Weight =1245.5 N

Height h = 60 ft

We know that

1 ft = 0.3048 m

So 60 ft = 18.28 m

h =18.28 m

Power = 3.5 hp

We know that

1 hp =0.74 KW

So 3.5 hp = 2.61 KW

Power = 2.61 KJ/s

So the work done by fireman = Weight x h

Now by putting the values

Work done by fireman= 1245.5 x 18.28 J

Work done by fireman= 2267.74 J

Work done by fireman= 2.26774 KJ

We know that 1 Btu= 1.05 KJ

So 2.266 KJ = 2.15 Btu

Work done by fireman= 2.15 Btu

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Power x time = work

2.61 x t = 2.26

So t= 0.86 sec

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3 years ago

A circuit with two or more branches for current to flow

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If there's any point in a circuit where the current has a choice
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The wavelength of red light is 7 x 10^-7 meter. Express this value in nanometers

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Wavelength is given as : 7× $10^{-7}$ meter

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X nanometer = 7× $10^{-7}$ meter

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3 years ago

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frez [133]

a.

The work done by a constant force along a rectilinear motion when the force and the displacement vector are not colinear is given by:

$W=F\cos\theta\cdot d$

where F is the magnitude of the force, theta is the angle between them and d is the distance.

The problen gives the following data:

The magnitude of the force 750 N.

The angle between the force and the displacement which is 25°

The distance, 26 m.

Plugging this in the formula we have:

$\begin{gathered} W=\left(750\right)\left(\cos25\right)\left(26\right) \\ W=17673 \end{gathered}$

Therefore the work done is 17673 J.

b)

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$P=\frac{W}{t}$

the problem states that the time it takes is 6 s. Then:

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1 year ago

What is the average (mean) of these numbers: 13,43, 12, 3,66

algol13

Answer:

27.4

Explanation:

(13+43+12+3+66)/5

137/5

27.4

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3 years ago

Read 2 more answers