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GREYUIT [131]
3 years ago
10

Calculate how much work you need to move the 130 N trunk to a ledge 2 m above.

Physics
2 answers:
kupik [55]3 years ago
8 0
Formula for the work is
W=Fs
where F is force and s is distance
Now we can just substitute our data and find work
W=130N*2m=260J
The result is 260J.
vaieri [72.5K]3 years ago
4 0
The absolute minimum work required for that job is the potential energy that will be added to the trunk by moving it up 2meters.

Potential energy = (weight) x (height) = (130 N) x (2) = <em>260 Joules</em>

That's the absolute minimum, because the trunk itself needs that much
energy in order to get up there.  But if you're doing the lifting, you may need
to expend more energy than that, just because the human body is not a
100% efficient machine.  It always takes more work to do something physical
than the energy you actually deliver to the job.

Here's a mind-blowing factoid: 
Do you see that 260 joules up there in the answer to the trunk ?
If you eat, let's say, 1800 Calories a day and don't gain any weight, that means
that you're burning off 260 joules of energy about every 3 seconds ! ! ! 
Just to keep your body warm, keep your breathing going, keep your brain
in tune, and move yourself around !  
Enough energy to lift that 30-pound trunk about 6-1/2 feet straight up off
the floor !


1 Calorie = 4184 joules
1 day = 86,400 seconds
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You are standing 2.5m directly in front of one of the two loudspeakers. They are 3.0m apart and both are playing a 686Hz tone in
ahrayia [7]

Answer:

distance from speaker is 17.87 m

Explanation:

given data

distance from loudspeaker = 2.5 m

distance between loudspeaker = 3.0 m

room temperature = 20c

wavelength f  = 686Hz

to find out

what distances from the speaker

solution

we know sound velocity c = 331.5  + 0.6 × 20c = 343.5

so wavelength of sound  λ = c / f  

wavelength = 343.5 /  686 = 0.5 m

when the difference in distance of speaker destructive interference will be

d = λ/2 × (2n-1)

for n = 1, 2 3 4 ..

d = 0.5/2 × (2n-1)

d = 0.250 , 0.75 , 1.25 , 1.750............   for n = 1, 2 3 .............

so

for d = 0.250

side of triangle by hypotenuse of triangle are

\sqrt{3^{2}+(2..5+x)^{2} } - (2.5 + x1) = 0.250

0.5 x1 = 7.6875

x1 = 15.375 m

for d = 0.75

side of triangle by hypotenuse of triangle are

\sqrt{3^{2}+(2..5+x)^{2} } - (2.5 + x2) = 0.75

1.5 x2 = 4.6875

x2 = 3.125 m

for d = 1.250

side of triangle by hypotenuse of triangle are

\sqrt{3^{2}+(2..5+x)^{2} } - (2.5 + x3) = 1.250

2.5 x2 = 1.1875

x3 = 0.475 m

for d = 1.750

x4 will be negative so we stop here

so the distance from speaker here is given below

distance = 2.5 + x

here x = 0.475 , 3.125 and 15.375 so

distance 1 = 2.5 + 0.475  = 2.975 m

distance 2 = 2.5 + 3.125  = 5.625 m

distance 3 = 2.5 + 15.375 = 17.875 m

final distance from speaker is 17.87 m

8 0
3 years ago
2.2.4 Quiz: Conservation of Energy
dexar [7]

Answer:

it is the judicious use of energy to prevent wastage

7 0
2 years ago
What are the parts of a wedge and their function?​
Svet_ta [14]

Answer:

A wedge is a machine that consists of two inclined planes, giving it a thin end and thick end. A wedge is used to cut or split apart objects. Force is applied to the thick end of the wedge, and the wedge applies force to the object along both of its sloping sides. This force causes the object to split apart

5 0
2 years ago
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SIZIF [17.4K]
The correct answer is the Sun.i hope that helped! if you have any questions or concerns about the answer i gave you please let me know!!
4 0
3 years ago
A 29.1 liter tank contains ideal helium gas at 35.8°C and a pressure of 21.8 atm How many moles of gas are in the tank?
crimeas [40]

Answer:

No. of moles, n = 25.022 moles

Given:

Volume of gas in tank, V = 29.1 l

Temperate of gas, T = 35.8^{\circ} = 273 + 35.8 = 308.8 K

Pressure of gas, P = 21.8 atm

Solution:

Making use of the ideal gas equation which given as:

PV = nRT

where

R = Rydberg's constant = 0.0821 L-atm/mol-K

Re-arranging the above formula for 'n' and putting the values in the above formula:

n = \frac{PV}{RT}

n = \frac{21.8\times 29.1}{0.0821\times 308.8}

n = 25.022

3 0
3 years ago
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