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3 years ago

7

The number of spiders in the house and the outside air temperature have an indirect relationship. What will happen to the number

of spiders in the house as the outside air temperature decreases?
decrease
increase
stay the same
increase then decrease in a regular pattern

1 answer:

serg [7]3 years ago

5 0

B. Increase.. because it will be colder outside.

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3 years ago

A 10 m long steel beam is accidentally dropped by a construction crane from a height of 4.89 m. The horizontal component of the

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Answer:

e = 1.21 mV

Explanation:

given,

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The contour interval of a topographic map is 25 feet. How many contour lines will be drawn between sea level and an elevation of

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3 years ago

An electron is moving in a circular orbit in a uniform magnetic field. Is the kinetic energy of the electron changing?

Lelechka [254]

Answer:

kinetic energy does not change

Explanation:

you can use the formula for the kinetic energy of the electron and for the radius of the trajectory of an electron in a uniform magnetic field:

$E_k=\frac{1}{2}m_ev^2\\\\r=\frac{m_e v}{qB}$

me: mass of the electron

B: magnetic field

q: charge of the electron

r: radius

By doing v the subject of the formula and replace it in the expression for the kinetic energy you obtain:

$v=\frac{rqB}{m_e}\\\\E_k=\frac{1}{2}m_e(\frac{rqB}{m_e})^2=\frac{r^2q^2B^2}{2m_e}$

as youcan see, all parameters r, q, B and me are constant.

hence, the kinetic energy does not change

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3 years ago