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2 years ago

Which of the following describes a situation that would violate the law of entropy?

Physics

1 answer:

White raven [17]2 years ago

6 0

Answer:

B. An Iron Bar place in a room becomes cooler than its surroundings.

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What is the mass of an atom with six protons, seven neutrons, and eight electrons?

qaws [65]

Answer:

Explanation:

The mass of an atom= number of protons + number of neutrons

7 0

3 years ago

Determine the velocity required for a moving object 2.00 x 10^4 m above the surface of Mars to escape from Mars's gravity. The m

Ket [755]

Answer:

Therefore the escape velocity from Mar's gravity is $15.88 \times 10^4$ m/s.

Explanation:

Escape velocity: Escape velocity is a the minimum velocity that a object needs to escape from the gravitational field of massive body.

$V_{escape}=\sqrt{\frac{2GM}{R}}$

$V_{escape}=$ Escape velocity

G=Universal gravitational constant = 6.673×10⁻¹¹N m²/Kg²

M= mass of Mars = 6.42×10²³ kg

R = Radius of the Mars = 3.40×10³m

The escape velocity does not depend on the velocity of a object.

$V_{escape}=\sqrt{\frac{2\times6.673\times 10^{-11}\times 6.42\times 10^{23}}{3.40\times10^3}}$

$=15.88 \times 10^4$ m/s

Therefore the escape velocity from Mar's gravity is $15.88 \times 10^4$ m/s.

3 0

3 years ago

Starting from rest, a wheel with constant angular acceleration turns through an angle of 25 rad in a time t. What will its angul

alexandr402 [8]

Answer:

θ = 225 rad

Explanation:

given data

angle = 25 rad

to find out

angular velocity after 3t?

solution

let angular acceleration α in t

θ = ω × t + 0.5 × α × t² ........................1

here ω = 0 (initial velocity )

so put this value here

25 = 0 + 0.5 × α × t² ..........................2

α = 25 ÷ (0.5 t²)

α = 50 ÷ t² .........................3

now here we take in 3t

θ = ω × 3t + 0.5 × α × (3t)²

for ω = 0

θ = 0 + 0.5 × α × 9t²

now put value in eq 2

θ = (0.5) × (50 ÷ t²) × (3t)²

θ = 25 × 9

θ = 225 rad

6 0

3 years ago

A speedy tortoise can run with a speed of <img src="https://tex.z-dn.net/?f=v_T" id="TexFormula1" title="v_T" alt="v_T" align="a

Vinil7 [7]

Answer:

$t_{H} = t_{T} - 60$

Explanation:

Thinking process:

Let:

distance = speed × time

for the hare:

$d_{H} = s_{H} t_{H}$

for the tortoise:

$d_{T} = s_{T} t_{T}$

Let the length of the shell be s. Then the two are related. So:

$d_{H} = d_{T} - s$

Let's say the hare ran at x times the speed of the tortoise:

$s_{H} = xs_{T}$

So, the equation still holds : $t_{H} = t_{T} - 60$

8 0

3 years ago

How does velocity differ from speed? What changes in motion can result in a change in velocity?

olga55 [171]

-Velocity is the speed of any moving object in a given direction, whilst Speed is the rate of an object's ability to move.
-Velocity can change if the direction or time is changed, the basic equation of velocity is: v = d/t
v - velocity
d - distance
t - time
If one of these factors change, it affects the other.

Hope this answers the question!

4 0

3 years ago

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