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4 years ago

An object is traveling at a constant velocity of 10m/s for 4 seconds. What is its acceleration?

Physics

1 answer:

saw5 [17]4 years ago

5 0

Answer:

<h2>The answer is 2.5 m/s²</h2>

Explanation:

The acceleration of an object given it's velocity and time taken acting on it can be found by using the formula

$acceleration = \frac{velocity}{time} \\$

From the question

time = 4 s

velocity = 10 m/s

So we have

$acceleration = \frac{10}{4} = \frac{5}{2} \\$

We have the final answer as

Hope this helps you

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A heat engine operates between a hot reservoir with a temperature of 400 K and a cold reservoir with a temperature of 300 K. The

natali 33 [55]

Answer:

Explanation:

Given

Temperature of Hot reservoir $T_1=400 K$

Temperature of Cold reservoir $T_2=300 K$

Heat reservoir $Q=500 J$

Work done $W=150 J$

heat Exhaust $Q_{rejection }=350 J$

$Q=W+Q_{rejected}$

$500=150+350$

L.H.S=R.H.S

thus it follows first law

$\eta _{carnot}=1-\frac{T_L}{T_H}$

$\eta _{carnot}=1-\frac{300}{400}$

$\eta _{carnot}=0.25$

Cycle Efficiency

$\eta =\frac{W}{Q}=\frac{150}{500}=0.3$

Carnot efficiency is less than cycle thus it violates second law

3 0

4 years ago

What is word meaning "heated to a glow"?

adell [148]

I think the word you want is "incandescent".

5 0

3 years ago

The quantity of charge q (in coulombs) that has passed through a surface of area 2.00 cm2 varies with time

Makovka662 [10]

Explanation:

We have,

Surface area, $A=2\ cm^2=0.0002\ m^2$

The current varies wrt time t as :

$q(t) = 4t^3 + 5t + 6$

(a) At t = 2 seconds, electrical charge is given by :

$q(t) = 4t^3 + 5t + 6\\\\q(2) = 4(2)^3 + 5(2) + 6\\\\q=48\ C$

(b) Current is given by :

$I=\dfrac{dq}{dt}\\\\I=\dfrac{d(4t^3 + 5t + 6)}{dt}\\\\I=12t^2+5$

Instantaneous current at t = 1 s is,

$I=12(1)^2+5=17\ A$

Current density is given by electric current per unit area.

$J=\dfrac{I}{A}\\\\J=\dfrac{(12t^2+5)}{0.0002}\\\\J=5000(12t^2+5)\ A/m^2$

Therefore, it is the required explanation.

7 0

4 years ago

What is meant by the term resistance?

kondor19780726 [428]

Answer:

Definiton 1.the refusal to accept or comply with something; the attempt to prevent something by action or argument

Definition 2. the ability not to be affected by something, especially adversely

Definition 3. the impeding, slowing, or stopping effect exerted by one material thing on another

Definiton 4: the degree to which a substance or device opposes the passage of an electric current, causing energy dissipation. Ohm's law resistance (measured in ohms) is equal to the voltage divided by the current.

Explanation:

<em>Hope this Helps! If not Correct me!</em>

5 0

3 years ago

The sudden drain of a magma chamber can form a caldera.<br><br> True<br><br> False

Sladkaya [172]

Maybe true not sure......?

6 0

3 years ago

Read 2 more answers