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4 years ago

What causes seasons to occur in certain zones?

1 answer:

4 0

A because the earth have four season and four name for its tilt around the sun. one aphelion prehelion but spring and fall is balance. when its summer in the north it is cold in the south because of son rays

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A food web is shown below. Hawk Fox Snake Mouse Frog Grasshopper Beetle Fungus Grass Which organisms could be both predators and

xxTIMURxx [149]

Answer:

A fox and hawk can be both a predator and prey

8 0

3 years ago

Lists the 4 states of matter from most amount of thermal energy to least amount of thermal energy?

Cerrena [4.2K]

Answer:

Explanation:

plasma, gas, liquid, solid

3 0

3 years ago

An electron (charge = –1.6 x 10–19 C) is moving at 3.0 x 105 m/s in the positive x direction. A magnetic field of 0.80 T is in t

Marta_Voda [28]

Answer:

F = 3.84*10^-34N ^j

Explanation:

In order to calculate the magnetic force on the electron you use the following formula:

$\vec{F}=q\vec{v} \ X\ \vec{B}$ (1)

q: charge of the electron = -1.6*10^-19C

B: magnitude of the magnetic field = 0.80T

v: speed of the charge = 3.0*10^5 m/s

The direction of the motion of the electron is in the +i^ direction (+x direction). The magnetic field is in the +^k direction (+z direction).

The cross product between these unit vectors, by taking into account the minus sign of the charge, is given by:

-^i X ^k = ^j

The magnetic force is in the ^j direction (+y direction).

The magnitude of the magnetic force is:

$F=qvB=(1.6*10^{-19}C)(3.0*10^5m/s)(0.80T)=3.84*10^{-34}N$

The magnetic force on the electron has a magnitude of 3.84*10^-34N in the +y direction

7 0

3 years ago

Star a has an absolute magnitude of 8. what is its apparent magnitude at a distance of 100 pc

tresset_1 [31]

From the definition of apparent magnitude, we know that:
$m_{1} - m_{2} = -2.5Log( \frac{F_{1}}{F_{2}} )$
where:
m = apparent magnitude
F = corresponding flux

We also know that the flux is given by the formula:
$F = \frac{L}{4 \pi d^{2} }$
where:
L = luminosity
d = distance

Therefore:
$\frac{F_{1} }{F_{2}} = (\frac{L_{1} }{4 \pi d_{1}^{2} })(\frac{4 \pi d_{2}^{2} }{L_{2} }) \\ = \frac{L_{1}d_{2}^{2}}{L_{2}d_{1}^{2}}$

Now, let's apply these formulae to the same star (therefore, same luminosity), using apparent magnitude and absolute magnitude (which is defined as the apparent magnitude the star would have if it were at a distance of 10pc):
$m - M = 2.5 Log ( \frac{d}{10pc})^{2}$

Now, let's solve for m:
$m = M + 2.5 Log ( \frac{d}{10})^{2}$
= <span> $8 + 2.5 Log ( \frac{100}{10})^{2}$ </span>
= 13

Hence, the apparent magnitude of the star would be m = +13

3 0

4 years ago

Lloyd is a computer technician who his company sends to customers' homes to fix their broken computers. He usually fixes between

chubhunter [2.5K]

Answer:c. labor-intensive.

Explanation:labor intensive is a process where a larger portion of total costs is due to labor as compared with the portion for costs incurred in purchase, maintenance, and depreciation of capital equipment. Example are Agriculture, construction, and coal-mining.

Industries that produce goods or services requiring a large amount of labor. Traditionally, labor intensive industries were determined by the amount of capital needed to produce the goods and services.

5 0

3 years ago