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3 years ago

Consider the following statements:

Physics

1 answer:

valentinak56 [21]3 years ago

4 0

Answer:

1. A only

Explanation:

First law of thermodynamics it sates that energy of the universe is constant.It is also known as energy conservation law.

Therefore according to the first law of thermodynamics ,the thermal energy of the system is unchanged.

Second law of thermodynamics states that ,it is impossible to make a device which take heat from higher temperature energy resource and give 100 % work without heat rejecting.

Therefore only option A is correct.

1. A only

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Aang and Appa are flying over Ba Sing Se. They covered 500 m in 30 seconds while heading east. What was their velocity?

barxatty [35]

Answer:

Explanation:

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4 years ago

As the earth rotates, what is the speed of a physics student in Miami, Florida, at latitude 26∘26∘? Ignore the revolution of the

Ugo [173]

Answer:

v = 418.31 m/s

Explanation:

given,

Radius of earth = 6400 Km

latitude at Miami, Florida = 26°

first we have to find the radius of the rotation at that latitude.

radius = 6400 x 1000 x cos 26°

circumference will be equal to = 2 π r

cos θ is used because at equator angle is zero radius is maximum and cos θ is maximum at 0°

calculation of time to

time = 24 hr

t = 24 x 60 x 60 = 86400 s

$speed = \dfrac{distance}{time}$

$v= \dfrac{2\times \pi \times 6400\times 1000\times cos 26^0}{86400}$

v = 418.31 m/s

speed of a physics student in Miami, Florida is equal to v = 418.31 m/s

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3 years ago

Please help me<br><br>how long did bob take to complete the race? explain your answer

Taya2010 [7]

Answer:

14 seconds

Explanation:

The line which represents Bob reaches 100m when the time is 14 seconds (14,100).

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3 years ago

Read 2 more answers

A device experiences a voltage drop of 5.0 V across it while a current of 10.0 mA flows through it. How much power does it dissi

Kipish [7]

Answer:

0.05 W

Explanation:

The power dissipated by a device can be written as

$P=VI$

where

P is the power dissipated

V is the voltage drop on the device

I is the current flowing through the device

In this problem, we have

V = 5.0 V is the voltage drop across the device

I = 10.0 mA = 0.01 A is the current through it

By applying the formula, we find the power dissipated:

$P=(5.0 V)(0.01 A)=0.05 W$

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3 years ago

Radiation makes it impossible to stand close to a hot lava flow. Calculate the rate of heat transfer by radiation, in kW, from 1

Leya [2.2K]

Answer:

1.5 x 10⁵ W

Explanation:

A = Area of the fresh lava = 1.02 m²

T = Temperature of fresh lava = 1000 °C = 1000 + 273 = 1273 K

T₀ = Temperature of surrounding = 25.3 °C = 25.3 + 273 = 298.3 K

ε = emissivity of the lava = 0.97

σ = stefan's constant = 5.67 x 10⁻⁸ Wm⁻²K⁻⁴

Rate of transfer is given as

E = σ ε A (T⁴ - T₀⁴)

E = (5.67 x 10⁻⁸) (0.97) (1.02) ((1273)⁴ - (298.3)⁴)

E = 1.5 x 10⁵ W

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3 years ago