Newton's Law of Cooling says that the rate of cooling of an object is proportional to the difference between its own temperature and the temperature of its surrounding. Write a differential equation that expresses Newton's Law of Cooling for this particular situation.

Answers

Answer 1

Answer:

Answer:

$(dQ)/(dt) =-hA\Delta T(t)$

Explanation:Newton.s law of cooling states that the rate of cooling of an object is proportional to the difference between its own temperatures and temperature of its surroundings. Mathematically,

$(dQ)/(dt) =-hA [T(t)-T(s)]\n$

$(dQ)/(dt) =-hA\Delta T(t)$

where $Q$ is the heat transfer

$h$ is heat transfer coefficient

$A$ is the heat transfer surface area

$T$ is the temperature of the object's surface

$T(s)$ is the temperature of the surroundings

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My dog Callie can run at 21 mi/h. How far can he travel in 10 hours?

Answers

Answer: 210 miles

Explanation:

21 mi/1 hr

21 * 10 hrs

210 mi

Which of the following best explains why most chemical reactions proceed more quickly when the concentrations of reactants are increased?a. The increased concentration increases the number of collisions between molecules.
b. The products of chemical reactions are more stable at higher concentrations.
c. At higher concentrations, reactant molecules move more quickly.
d. At higher concentrations, product molecules are able to catalyze the reaction.

Answers

A.
Because you increase the concentration of the reactants, it means that there are more molecules of the reactants present in a smaller amount of space.

This being the case, there is a higher chance that these molecules will collide with enough energy to overcome the activation barrier.

The other ones are completely wrong, but if you would like an explanation as to why they are, just ask :)

Answer:

The increased concentration increases the number of collisions between molecules.

Explanation:

I just took the test. Flvs

When you whisper, you produce a 10-dB sound.a. When you speak quietly, your voice sounds twice as loud as a whisper. How many decibels is this?
b. When you speak normally, your voice sounds 4 times as loud as a whisper. How many decibels is this?
c. When you yell, your voice sounds 8 times as loud as a whisper. How many decibels is this?

Answers

All you would do is for a, 10 times 2 is 20 so it would be 20-dB
For b, 10 times 4 is 40 so it would be 40-dB
For c, 10 times 8 is 80 so it would be 80-dB

When a baseball player throws a ball straight up, by how much does the velocity of the ball decrease each second

Answers

It decreases 9.8 meters per second each second, until it reaches
its highest point and starts falling. Then its speed increases
9.8 meters per second each second, until it hits the ground.

What part of a motor causes its electromagnet to turn in the same directionconsistently, transforming electrical energy into mechanical energy?
A. Commutator
B. Loop of wire
C. Permanent magnets
D. Battery

PLS HELP

Answers

Commutator is part of a motor causes its electromagnet to turn in the same direction consistently, transforming electrical energy into mechanical energy.

What is energy?

Energy is the ability or capability to do tasks, such as the ability to move an item (of a certain mass) by exerting force. Energy can exist in many different forms, including electrical, mechanical, chemical, thermal, or nuclear, and it can change its form.

A commutator is a rotary electrical switch in certain types of electric motors and electrical generators.

Commutator is part of a motor causes its electromagnet to turn in the same direction consistently, transforming electrical energy into mechanical energy.

To learn more about energy refer to the link:

brainly.com/question/1932868

#SPJ5

Answer:

A. Commutator

Explanation:

How do the speeds v0, v1, and v2 (at times t0, t1, and t2) compare?a: v0 = v1 = v2 > 0
b: v0 = v2 > v1 = 0
c: v0 = v2 > v1 > 0
d: v0 > v1 > v2 > 0
e: v0 > v2 > v1 = 0

Answers

The correctanswer between all the choices given is the third choice or letter C. I amhoping that this answer has satisfied your query and it will be able to helpyou in your endeavor, and if you would like, feel free to ask another question.

Answer: option c: v₀ = v₂ > v₁ > 0

Explanation:

1) Velocity is the rate of change of the position with time. Therefore, in a graph of position vs time, the velocity is the slope of the path that describes the motion.

2) In this case you are requested to compare the speeds, i.e. just the magnitudes of the velocities. You can perform that by comparing the slopes in the three positions (x₀, y₀), (x₁, y₁), and (x₂, y₂).

3) Regarding v₁, since it corresponds to the peak of the curve (x₁.y₁), the vertical component of the velocity is zero (the horizontal component is constant, since there is not any horizontal force acting), so at this point the speed reaches its minimum value, then v₁ > 0, and v₁ is less than any other speed.

4) Regarding v₀ and v₂, at (x₀, y₀) and (x₂, y₂), note that those are points at the same distance from the axis of symmetry of the curve (assuming it is perfect parabola, which is what the graph intends to show).

That means that the velocities at those points are equal in magnitude but opposite in signs. Since, you are asked about the speed, which is magnitude, you conclude v₀ = v₂.

In conclusion v₀ = v₂ > v₁ > 0, which is the option c.

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