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hoa [83]
4 years ago
5

What is the force applied by a spring as it stretches upward 0.25 meters and has a k value of 25 newtons per meter

Physics
1 answer:
blsea [12.9K]4 years ago
8 0
To determine the force, we use the Hooke's Law which says that the force required to extend or compress a certain spring is proportional directly to the total change in distance. It is expressed as:

F = kx   where k is the spring constant and x is the distance

We calculate as follows:

F = 25 (0.25)
F = 6.25 N 

Therefore, the correct answer is option 3, 6.3 N.
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Answer:

a = 45 m/s/s

Explanation:

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total mass of the fuel is given as

m = 2000 kg

all the fuel is burnt in 15 s

so rate of the fuel burning is given as

\frac{dm}{dt} = \frac{2000}{15}

\frac{dm}{dt} = 133.33 kg/s

now the thrust force on the rocket is given as

F_{th} = v\frac{dm}{dt}

(6000 - 133.33 t) a = (900 + v)(133.33)

so we have

\frac{dv}{900 + v} = (133.33)\frac{dt}{6000 - 133.33 t}

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ln(\frac{900 + v}{900}) = - ln(\frac{6000 - 133.3 t}{6000})

1 + \frac{v}{900} = \frac{6000}{6000 - 133.3 t}

now acceleration is rate of change in velocity

\frac{1}{900}\frac{dv}{dt} = \frac{133.3\times 6000}{(6000 - 133.3t)^2}

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3 0
4 years ago
If element X has 96 protons, how many electrons does it have
NNADVOKAT [17]
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3 years ago
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7 0
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A cartridge electrical heater is shaped as a cylinder of length L = 200 mm and outer diameter D = 20 mm. Under normal operating
KengaRu [80]

Answer:

Ts=51.83C

Explanation:

First we calculate the surface area of ​​the cylinder, neglecting the top and bottom covers as indicated by the question

Cilinder Area= A=πDL

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we use the equation for heat transfer by convection

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Solving for ts

Ts=q/(ha)+T

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4 0
3 years ago
In a double-slit experiment, light and dark regions are observed on a screen. what causes a dark region to be observed between t
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