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1 day ago

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A steel cable lifting a heavy box stretches by ΔL . In order for the cable to stretch by only half of ΔL , by about what factor

must its diameter increase? 1.4 4.0 2.0 0.25 0.50

1 answer:

Keith_Richards [3.1K]1 day ago

6 0

Answer:

2.0

Explanation:

because I'm a geek and ik

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If a person weighs 882 N on the surface of the earth, at what altitude above the earth’s surface must they be for their weight t

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Para calcular el peso utilizamos la fórmula:
$F=m*g=882N$

Cuando tenemos dos cuerpos, empleamos la fórmula de la gravedad general:
$F=G* \frac{ M_{p}*M_{E} }{ r^{2} }$
Donde:
G = constante de gravedad = $6.67* 10^{-11} m^{3} kg^{-1} s^{-2}$
Mp = masa de la persona = 882 / 9.81= 89.9kg
ME = masa de la Tierra = $5.97* 10^{24} kg$
r = distancia entre la Tierra y la persona

A partir de estas dos fórmulas, deducimos que los lados izquierdos son equivalentes, por lo tanto, los lados derechos también deben serlo.
$m*g=G* \frac{ M_{p}*M_{E} }{ r^{2} }$

Resolviendo esta ecuación para r:
$r= \sqrt{G* \frac{ M_{p}*M_{E}}{M_{p}*g}$
r=6371116m = 6371.116km

Esta es la distancia desde el centro de la Tierra. El radio de la Tierra es 6370km y la altura sobre la superficie es 6371.116 - 6370 = 1.116km o 1116m.

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1 month ago

A window washer on a hanging platform cleans the outside of windows on a skyscraper. The washer hoists the platform up the side

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Answer:

The acceleration of the platform is - 1.8 m/s²

Explanation:

The net force on a body causes that body to accelerate in the direction of the resultant force applied.

Setting up the force equilibrium for the configuration:

ma = 800 - mg

100a = 800 - 100×9.8

100a = - 180

100a = - 180

a = - 1.8 m/s²

This indicates that the body is falling downward.

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Answer:

At this position, the magnetic field equals ZERO

Explanation:

The magnetic field produced by a moving charge is described as

$B = \frac{\mu_0 qv sin\theta}{4\pi r^2}$

Here, we determine the direction of the magnetic field using

$\hat B = \hat v \times \hat r$

Thus, we find

$\hat B = \hat i \times (\hat i + 0\hat j + 0\hat k)$

Leading to a magnetic field of ZERO

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The δe of a system that releases 12.4 j of heat and does 4.2 j of work on the surroundings is __________ j.

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For this issue, the answer is clarified as the system takes in energy (+). The surroundings contribute 84 KJ of work. Whenever a system is receiving work from its surroundings, the value will be positive. Therefore, it sums to 12.4 KJ + 4.2 = 16.6 KJ.

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A charged wire of negligible thickness has length 2L units and has a linear charge density λ. Consider the electric field E-vect

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Answer:

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Consider the following:

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Thus,

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