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vagabundo [1.1K]
2 years ago
12

A winch is capable of hauling a ton of bricks vertically two stories (6.35 m ) in 24.5 s .

Physics
2 answers:
sasho [114]2 years ago
8 0

Answer:

53 % efficient

Explanation:

6.35 m converts to 20.83 ft

2000 lb (20.83 ft) / (24.5 s) = 1700 ft•lb/s

1700 ft•lb/s / (550 ft•lb/s / hp) = 3.09 hp

3.09 / 5.80 = 0.5330...

maxonik [38]2 years ago
3 0

Answer: 84 %

Explanation:

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A 1kg ball is dropped (from rest) 100m onto a spring with spring constant 125N/m. How much does the spring compress?
Anastasy [175]

Answer:

3.95 m

Explanation:

m = 1 kg, h = 100 m, k = 125 N/m

Let the spring is compressed by y.

Use the conservation of energy

potential energy of the mass is equal to the energy stored in the spring

m x g x h = 1/2 x ky^2

1 x 9.8 x 100 = 0.5 x 125 x y^2

y^2 = 15.68

y = 3.95 m

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3 years ago
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E) The number of moles of the helium of the balloon can be found by using the ideal gas law, which states:
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A) This nuclear equation is an example of alpha-decay, where an unstable nucleus (uranium-235) decays into a daughter nucleus (thorum-231) releasing an alpha particle (a nucleum of helium, consisting of 2 protons and 2 neutrons). 

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7 0
3 years ago
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Imagine that you move a substance from one container to another and its volume changes. What state of matter is that substance?
Naddika [18.5K]

If it's volume changes when you move it to the new container it would be a solid

4 0
2 years ago
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A small but measurable current of 3.8 × 10-10 A exists in a copper wire whose diameter is 2.5 mm. The number of charge carriers
Karolina [17]

Answer:

a) 4.9*10^-6

b) 5.71*10^-15

Explanation:

Given

current, I = 3.8*10^-10A

Diameter, D = 2.5mm

n = 8.49*10^28

The equation for current density and speed drift is

J = I/A = (ne) Vd

A = πD²/4

A = π*0.0025²/4

A = π*6.25*10^-6/4

A = 4.9*10^-6

Now,

J = I/A

J = 3.8*10^-10/4.9*10^-6

J = 7.76*10^-5

Electron drift speed is

J = (ne) Vd

Vd = J/(ne)

Vd = 7.76*10^-5/(8.49*10^28)*(1.60*10^-19)

Vd = 7.76*10^-5/1.3584*10^10

Vd = 5.71*10^-15

Therefore, the current density and speed drift are 4.9*10^-6

And 5.71*10^-15 respectively

3 0
2 years ago
Which layer in the image above represents the layer of the Earth composed of liquid metal? *
weeeeeb [17]

Answer:

4

Explanation:

5 0
2 years ago
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