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4 years ago

8

Which quantity below is a derived quantity?

2 answers:

andrew11 [14]4 years ago

7 0

C.) speed is derived quantity.

Reil [10]4 years ago

4 0

By definition, the speed of an object is given by:

$v = \frac{dr}{dt}$

Where,

dr/dt: derived from the position with respect to time

Therefore, speed has units of length over units of time.

Thus, speed is a derived quantity, since it depends on the value of two other quantities.

Answer:

a derived quantity is:

C. Speed

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What is responsible for the production of x ray emission at the cutoff wavelength?

Katen [24]

Answer:

correct answer is option 5 (The emission by the incident electron when it loses its energy in a single emission)

Explanation:

The emission by the incident electron when it loses its energy in a single emission then X-rays of minimum wavelength which is also known as X-rays of cut-off wavelength are emitted.

If potential V is applied on coolidge tube then cut-off wavelength of the continuous X-ray spectrum is related to the accelerating potential V by following equation

$\lambda_{cut-off} =\frac{hc}{eV} =\frac{12400}{V}$ Angstrom/V

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3 years ago

At a rock concert, the sound intensity 1.0 m in front of the bank of loudspeakers is 0.10 W/m2 . A fan is 30 m from the loudspea

marshall27 [118]

The concepts used to solve this problem are sound power, area of ear drum, and inverse square law. First find the intensity $I_2$ using inverse square law for different distances. Then find the area of the ear drum using the diameter and finally find the energy transferred to each ear drum in one second. Intensity is inversely proportional to the square of the distance from the source:

$I \propto \frac{1}{r^2}$

Here,

r = Distance from the source,

$\frac{I_1}{I_2} = \frac{r_2^2}{r_1^2}$

$I_2 = I_1 \frac{r_1^2}{r_2^2}$

$I_2 = (0.10W/m^2)(\frac{(1m)^2}{(30m)^2})$

$I_2 = 1.11*10^{-4}W/m^2$

Now the expression for the Area of ear drum is

$A= \frac{\pi d^2}{4}$

$A = \frac{\pi (8.4mm\frac{1m}{10^3mm})^2}{4}$

$A = 5.5*10^{-5}m^2$

The expression for Sound power is

$P = AI_2$

Replacing,

$P= (5.5*10^{-5}m^2)(1.11*10^{-4}W/m^2)$

$P = 6.1*10^{-9}W = 6.1*10^{-9}J/s$

Therefore the energy reached per second is $6.1*10^{-9}J$

4 0

3 years ago

The largest visible-light telescopes in the world use what device to collect as much light as possible before the light is broug

AlexFokin [52]

Answer:

Option C

Explanation:

Visible telescopes are the telescopes which are sensitive in the spectrum of the light in the visible range.

The visible light telescopes are of three types out of which the reflecting telescopes uses the mirror so as to collect light as much as it can.

Convex mirror is used in such telescopes to collect all the light that falls on it and then the mirror reflects the light back to the focus.

Thus the mirror acts a bucket of light for its collection and the helps to form the world's largest visible light telescope.

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4 years ago

A rocket fired two engines simultaneously. One produces a thrust 725 N directly forward while the other gives a 513N thrust at 3

dezoksy [38]

Answer:

Magnitude of resultant force is 1190.314 N

Direction of force is 13.352°

Explanation:

given data:

thrust force = 725 N

Angle = 32.4 degree

Let x is consider as positive direction

Resultant force in x direction is

Rx = 725 + 513cos32.4 = 1158.14 N

and Resultant force perpendicular to x direction is:

Ry = 513sin32.4 = 274.88 N

Magnitude of resultant force is

$R=\sqrt{R_x^2+R_y^2} = 1190.314N$

and resultant force direction is

$\theta=tan^{-1}\frac{R_y}{R_x} = 13.352\degree$

7 0

4 years ago

Which of the following is a disadvantage to asexual reproduction?

yulyashka [42]

D. no genetic diversity means organisms are vulnerable to diseases and environmental changes

5 0

3 years ago