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3 years ago

We see the Sun before it comes above the horizon. Explain.

Physics

1 answer:

siniylev [52]3 years ago

3 0

Answer:

Atmospheric refraction causes the Sun to be seen while it is still below the horizon. Light from the lower edge of the Sun's disk is refracted more than light from the upper edge. This reduces the apparent height of the Sun when it appears just above the horizon.

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The Chandra X-ray observatory is BEST equipped to search for which types of stars? Select all that apply.

Papessa [141]

The right answer for the question that is being asked and shown above is that: "A. neutron; B. red giants; C. black holes; E. main sequence." The Chandra X-ray observatory is BEST equipped to search for neutron, red giants, black holes, <span>main sequence.</span>

3 0

4 years ago

Read 2 more answers

A 57 kg skier starts from rest at a height of H = 27 m above the end of the ski-jump ramp. As the skier leaves the ramp, his vel

Hatshy [7]

Answer:

(a) $h=5.95m$

(b) h is the same

Explanation:

According to the law of conservation of energy:

$E_i=E_f\\U_i+K_i=U_f+K_f$

The skier starts from rest, so $K_i=0$ and we choose the zero point of potential energy in the end of the ramp, so $U_f=0$ . We calculate the final speed, that is, the speed when the skier leaves the ramp:

$mgH=\frac{mv^2}{2}\\v=\sqrt{2gH}\\v=\sqrt{2(9.8\frac{m}{s^2})(27m)}\\v=23\frac{m}{s}$

Finally, we calculate the maximum height h above the end of the ramp:

$v_f^2=v_i^2-2gh\\$

The initial vertical speed is given by:

$v_i=vsin\theta$

and the final speed is zero, solving for h:

$h=\frac{v_i^2}{2g}\\h=\frac{((23\frac{m}{s})sin(28^\circ))^2}{2(9.8\frac{m}{s^2})}\\h=5.95m$

(b) We can observe that the height reached does not depend on the mass of the skier

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4 years ago

Microwaves and infrared waves are similar because they both have

Orlov [11]

Microwave and Infrared Radiation. Both are forms of electromagnetic radiation. Both are transmitted as waves. Waves are converted to heat.

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3 years ago

The current supplied by a battery in a portable device is typically about 0.151 A. Find the number of electrons passing through

butalik [34]

Answer:

n = 1.7*10²² electrons.

Explanation:

As the current, by definition, is the rate of change of charge, assuming that the current was flowing at a steady rate of .151 A during the 5 hours, we can find the total charge that passed perpendicular to the cross-section of the circuit, as follows:

$I =\frac{\Delta q}{\Delta t} \\ \\ \Delta q = I* \Delta t \\ \\ \Delta t = 5hs*\frac{3600s}{1h} = 18000 s$

⇒ Δq = I * Δt = 0.151 A * 18000 s = 2718 C

As this charge is carried by electrons, we can express this value as the product of the elementary charge e (charge of a single electron) times the number of electrons flowing during that time, as follows:

Δq = n*e

Solving for e:

$n = \frac{\Delta q}{e} =\frac{2718C}{1.6-19C} = 1.7e22 electrons.$

6 0

3 years ago

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The hair dryer has a plastic case so there is no need for an earth wire connection in the plug ,explain why the hair dryer is st

AVprozaik [17]

Answer:

plastics are unable to conduct electricity and heat due to there being no free flowing electrons, meaning they are safe to use.

Explanation:

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3 years ago

We see the Sun before it comes above the horizon. Explain.​

We see the Sun before it comes above the horizon. Explain.