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3 years ago

Which of these is a unit of heat? a. joule b. degree celsius c. kelvin d. tesla

1 answer:

3 0

-- Heat is a form of energy.
-- Joule is the SI unit of energy.
ergo
-- Joule is a unit of heat.

'Degree Celsius' and 'Kelvin' are units of temperature.
Heat and temperature are different things.
We won't go there right now.

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A river flows due east at 1.50 m/s. A boat crosses the river from the south shore to the north shore by maintaining a constant v

monitta

Answer:

$u = 10.11 \ m/s$

$x = 44.996 \ m$

Explanation:

From the question we are told that

The velocity of the river due east is $v = 1.150i \ m /s$

The velocity of the boat due north is $v_1 = 10j \ m/ s$

The width of the river is $d = 300 \ m$

Generally the velocity of the boat relative to the shore

$u = \sqrt{v^2 + v_1^2}$

=> $u = \sqrt{1.50 ^2 + 10^2}$

=> $u = 10.11 \ m/s$

Generally direction of the boat relative to the shore is mathematically represented as

$tan \theta = \frac{v}{v_1}$

=> $\theta = tan^{-1}[ \frac{v}{v_1}]$

=> $\theta = tan^{-1}[ \frac{1.5}{10}]$

=> $\theta = 8.53^o$

Generally the distance covered by the boat in the direction of flow of the river before reaching the north shore is mathematically represented as

$x = d* tan(\theta )$

=> $x = 300 * tan(8.53)$

=> $x = 44.996 \ m$

3 0

3 years ago

As water across the surface of the earth it dissolves material as it travels. What property of water does this demonstrate?

iris [78.8K]

Answer:

B) Water is a solvent

Explanation:

Among many other chemicals, water can dissolve a variety of substances. The solvent properties of chemicals are far beyond it. That property makes water a universal solvent.

Water has one atom of oxygen and two atoms of hydrogen.

One side of the water molecule is positively charged and the other side is negatively charged. This property attracts other substances like salt and disintegrates into positive and negatively charged ions. This property is due to its physical and chemical nature.

3 0

3 years ago

A non-reflective coating that has a thickness of 198 nm (n = 1.45) is deposited on top of a substrate of glass (n = 1.50). What

spin [16.1K]

Answer:

The wavelength is $\lambda_ 1 = 574.2 nm$

Explanation:

From the question we are told that

The thickness is $t = 198 nm = 198 *10^{-9 }\ m$

The refractive index of the non-reflective coating is $n_m = 1.45$

The refractive index of glass is $n_g = 1.50$

Generally the condition for destructive interference is mathematically represented as

$2 * n_m * t * cos (\theta) = n * \lambda$

Where $\thata$ $\theta$ is the angle of refraction which is 0° when the light is strongly transmitted

and n is the order maximum interference

$\lambda = \frac{2 * n * t * cos (\theta )}{n}$

at the point n = 1

$\lambda _1 = \frac{2 * 1.45 * 198*10^{-9} * cos (0 )}{1}$

$\lambda_1 = 574.2 *10^{-9}$

$\lambda_1 = 574.2 nm$

at n =2

$\lambda _2 = \frac{\lambda _1 }{2}$

$\lambda _2 = \frac{574.2*10^{-9} }{2}$

$\lambda _2 = 2.87 1 *10^{-9} \ m$

$\lambda _2 = 287. 1 nm$

Now we know that the wavelength range of visible light is between

$390 \ nm \to 700 \ nm$

So the wavelength of visible light that is been transmitted is

$\lambda_ 1 = 574.2 nm$

6 0

4 years ago

4. How many neutrons are there in an atom of protium? Deuterium? Tritium? <br> P

insens350 [35]

The main difference between protium, deuterium, and tritium is that protium has no neutrons in its nuclei, whereas deuterium is composed of one neutron and tritium is composed of two neutrons [17]. Protium is an isotope of hydrogen that is composed of one proton and one electron.

6 0

3 years ago

When different resistors are connected in parallel across an ideal battery, we can be certain that: a) their equivalent resistan

sergeinik [125]

Answer:

b) the potential difference across each is the same.

Explanation:

When resistors are connected in parallel with each other

then the terminals of all the resistors will connected across the terminals of the battery

So we know the potential difference of the battery is same across all the resistors

So we can say that the equivalent resistance of all the resistance is

$\frac{1}{R} = \frac{1}{R_1} + \frac{1}{R_2} + \frac{1}{R_3}$

so its not the mean of all resistors

also we know that the resistance are all different so power across each resistance is different given as

$P = \frac{V^2}{R}$

also current in each resistance is also different and given by

$i = \frac{V}{R}$

so correct answer will be

b) the potential difference across each is the same.

5 0

3 years ago