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4 years ago

Which option gives an object's volume in Sl units?

Physics

1 answer:

Phoenix [80]4 years ago

3 0

Answer:

Explanation:

K is the SI unit for Kelvin which measures temperature.

kg is NOT an SI unit, g is the SI unit for mass.

L is NOT an SI unit, m^3 is the SI unit for volume.

Therefore the answer is B.

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A 1.0 m × 1.5 m double-pane window consists of two 20-mm-thick layers of glass (k = 0.78 W/m·K) that are separated by a 13-mm ai

jeka94

Answer:

$\dot Q=105.042\ W$ is the heat loss by conduction.

Explanation:

Given:

area of window pane, $A=1.5\ m^2$

thickness of the glass pane, $x=0.02\ mm$

thickness of the air gap, $x'=0.013\ m$

thermal conductivity of the glass, $k=0.78\ W.m^{-1}.K^{-1}$

thermal conductivity of the air, $k_a=0.025\ W.m^{-1}.K^{-1}$

inside temperature, $T_i=20^{\circ}C$

outside temperature, $T_o=-20^{\circ}C$

<u>From the Fourier's law of conduction we have the rate of heat transfer as:</u>

$\dot Q=k.A.\frac{dT}{dx}$

$\dot Q=dT\div \frac{dx}{k.A}$

where:

k = thermal conductivity of the material

A = area subjected to the conduction

$dT =$ temperature difference across the two surfaces

dx = thickness of the surface

$\frac{dx}{k.A} =$ regarded as thermal resistance on electrical analogy

According to question here the heat transfer occurs due to conduction of the air.

Here we have two surfaces with air sandwiched between them. So we find an equivalent resistance:

$R_e=2\times \frac{x}{k.A}+ \frac{x'}{k_a.A}$

$R_e=2\times \frac{0.02}{0.78\times 1.5} +\frac{0.013}{0.025\times 1.5}$

$R_e=0.3808\ K.W^{-1}$

Therefore:

$\dot Q=40\div 0.3808$

$\dot Q=105.042\ W$

3 0

4 years ago

I need help please

densk [106]

Answer:

PLIS HELP PLSI PLSI PLIS

k 8987 pjbh hub hyujbnbj

4 0

3 years ago

Adjacent antinodes of a standing wave on a string are 15.0 cm apart. A particle at an antinode oscillates in simple harmonic mot

timama [110]

Answer:

Explanation:

A ) Distance between two adjacent anti-node will be equal to distance between two adjacent nodes . So the required distance is 15 cm .

B ) wave-length, amplitude, and speed of the two traveling waves that form this pattern are as follows

wave length = same as wave length of wave pattern formed. so it is 30 cm

amplitude = 1/2 the amplitude of wave pattern formed so it is .850 / 2 = .425 cm

Speed = frequency x wavelength ( frequency = 1 / time period )

= 1 / .075) x 30 cm

400 cm / m

C ) maximum speed

= ω A

= (2π / T) x A

= 2 X 3.14 x .85 / .075 cm / s

= 71.17 cm / s

minimum speed is zero.

D ) The shortest distance along the string between a node and an antinode

= Wavelength / 4

= 30 / 4

= 7.5 cm

3 0

3 years ago

The angle between the incident ray and the surface of a plane mirror is 20'. What is the total angle rotated by the incident ray

Dahasolnce [82]

Angle made by the light ray with the surface of mirror is given as

$\theta_i = 90 - 20 = 70$ degree

now as we know as per law of reflection that

angle of incidence = angle of reflection

So here we can say that

$\theta_i = \theta_r$

$\theta_r = 70 degree$

now the total angle that reflected ray will rotate with respect to incident ray is known as angle of deviation

$\delta =180 - \theta_i - \theta_r$

$\delta = 180 - 70 - 70 = 40 degree$

so here reflected light will deviate by total angle of 40 degree fron its incident ray.

7 0

4 years ago

How much thermal energy is put out by the speaker?

suter [353]

15 ? just a guess. :)

5 0

3 years ago

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