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3 years ago

When you pick something up do you do work to it

Physics

1 answer:

vaieri [72.5K]3 years ago

4 0

Answer:

Simple answer: Yes

Explanation:

Even if you touch an item with a stick you re still doing work to it, most of the time something sitting on a table not being disturbed is having work done to it. Everything has the force of gravity working on it to essentially keep the items from floating away so workis being done to it.

Work done can be something so small (e.g) a pencil sitting on a table) or as big as an earthquake or kicking a ball through a window and smashing the glass.

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Does it take 18 months for twins to be born, and 27 months for triplets, and so on?

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3 years ago

A residential subdivision encompasses 1100 acres with a housing density of four houses per acre. Assume that a high-value reside

aleksandrvk [35]

Answer:

(a). The average daily demand of this subdivision is 2444.44 gallon/min.

(b). The design-demand used to design the distribution system is 2444.44 gallon/min.

Explanation:

Given that,

Area = 1100 acres

Number of house in 1 acres = 4

$\text{Number of house in 1100 acres} = 4\times1100$

$\text{Number of house in 1100 acres} = 4400$

Per house water demand = 800 g/day/house

(a). We need to calculate the average daily demand of this subdivision

Using formula for average daily demand

$\text{average daily demand}=house\times\text{Per house water demand}$

$\text{average daily demand}=4400\times800\ gallon/day$

$\text{average daily demand}=3520000\ gallon/day$

$\text{average daily demand}=\dfrac{3520000}{24\times60}\ gallon/min$

$\text{average daily demand}=2444.44\ gallon/min$

The average daily demand of this subdivision is 2444.44 gallon/min.

(b). We need to calculate the design-demand used to design the distribution system

Using formula for the design-demand

$\text{design demand}=(Q_{max})daily\times\text{fire flow}$

$\text{design demand}=1.64\times2444.4\times1000$

$\text{design demand}=4008816\ gallon/m$

Hence, (a). The average daily demand of this subdivision is 2444.44 gallon/min.

(b). The design-demand used to design the distribution system is 2444.44 gallon/min.

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3 years ago

While in empty space, an astronaut throws a ball at a velocity of 11 m/s. what will the velocity of the ball be after it has tra

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It will be traveling at 11m/s, because there is no friction in empty space.

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4 years ago

The efficiency of a squeaky pulley system is 73 percent. The pulleys are usedto raise a mass to a certain height. What force is

larisa86 [58]

The efficiency of the machine is defined as

$\eta = \frac{W_{out}}{W_{in}}$

Here

Work out is the work output and Work in is the work input

To find the Work in we have then

$W_{in} = \frac{W_{out}}{\eta}$

$W_{in} = \frac{mgh}{\eta}$

Replacing with our values

$W_{in} = \frac{(58)(9.8)(3)}{73\%}$

$W_{in} = 2335.89J$

The work done by the applied force is

W = Fd

Here,

F = Force

d = Distnace

Rearranging to find F,

$F = \frac{W}{d}$

$F = \frac{2335.89J }{18}$

F = 129.77N

Therefore the force exerted on the machine after rounding off to two significant figures is 130N

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3 years ago