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3 years ago

Does the sun sun traces shortest path across local sky on june solstice

1 answer:

7 0

The June solstice in the Northern hemisphere is the summer solstice. The June Solstice in the Southern hemisphere is the winter solstice. The summer solstice is equivalent to the longest day while the winter solstice is equivalent to the shortest day. Therefore on the local sky, when is the June solstice we have have the longest day (longest path of sun in the sky) in the Northern hemisphere and the shortest day (shortest path of sun in the sky) in the Southern hemisphere.

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A train travelling at 20m/s undergoes a uniform deceleration of 2m/s2 when brakes are applied.. calculate the time taken to come

VLD [36.1K]

Answer:

a) 10 seconds

b) 100 meters

Explanation:

<u>Accelerated Motion </u>

If an object is moving at contant speed, we know it has zero net force applied. As soon as an unbalanced force appears, the object accelerates (positive or negative) depending on the direction of the force with respect to movement. The speed of an object subject to acceleration is given by

$v_f=v_o+at$

The distance traveled is given by

$\displaystyle x=v_ot+\frac{at^2}{2}$

Our train is travelling at 20m/s when it decelerates at $-2\ m/s^2$ (negative for it's against movement). If nothing else happens, it will eventually stop ( $v_f=0$ ). We can compute the time at which it happens :

$\displaystyle t=\frac{v_f-v_o}{a}$

$Knowing\ v_f=0$

$\displaystyle t=\frac{-20}{-2}=10\ sec$

The distance traveled is

$\displaystyle x=v_ot+\frac{at^2}{2}$

$\displaystyle x=(20)(10)-\frac{2(10)^2}{2}$

$\displaystyle x=100\ m$

6 0

2 years ago

Enlarged brain ventricles are presumed to signify __________. A. an excess of dopamine activity B. frontal lobe abnormalities C.

ANTONII [103]

The correct answer is d. deterioration of brain tissue. A brain ventricle is a fluid filled structure located in the parenchyma. The fluid in the ventricles is called cerebro-spinal fluid. An increase in the volume of this fluid can lead to a condition known as hydrocephalus.

8 0

3 years ago

Read 2 more answers

Christopher conducts an experiment in which he tests how much sugar dissolves at different temperatures of water. One step requi

sveticcg [70]

305.5 i just took the quiz

5 0

3 years ago

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What is the longest wavelength of radiation with enough energy to break carbon-carbon bonds?

iogann1982 [59]

The longest wavelength of radiation used to break carbon-carbon bonds is 344 nm.

<u>Explanation:</u>

The longest wavelength of radiation can also be stated as the minimum radiation frequency required to cut carbon-carbon bond should be equal to the threshold energy of the carbon-carbon bonds.

The threshold energy will be equal to the binding energy of the carbon-carbon bonds. As it is known that carbon-carbon bonds exhibit a binding energy of 348 kJ/mole, the threshold energy to break it, is determined as followed.

First, we have to convert the energy from kJ/mol to J, i.e., energy for the carbon-carbon molecules,

$\text { Energy } = \frac{348 \mathrm{KJ} / \mathrm{mol}}{6.023 \times 10^{23} \text { photons }} \times 1 \text { mole } \times 1000 = 57.77 \times 10^{-20} = 5.78 \times 10^{-19} J$