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3 years ago

Calculate the momentum value of .... (Include appropriate units on your answers.)

Physics

1 answer:

vekshin13 years ago

5 0

Given :

Mass of brick, m = 2 kg.

Speed of block, v = 12 m/s .

To Find :

The momentum of the brick.

Solution :

We know, momentum of any object is given by :

Momentum = Mass × Speed

Momentum = m × v

Momentum = 2 kg × 12 m/s

Momentum = 24 kg m/s

Therefore, the momentum of the brick is 24 kg m/s .

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It is known that the kinetics of recrystallization for some alloy obeys the Avrami equation, andthat the value of n in the expon

trapecia [35]

Answer: $8.76\times 10^{-3} min^{-1}$

Explanation:

Given

n=5

0.3 fraction recrystallize after 100 min

According to Avrami equation

$y=1-e^{-kt^n}$

where y=fraction Transformed

k=constant

t=time

$0.3=1-e^{-k(100)^5}$

$e^{-k(100)^5} =0.7$

Taking log both sides

$-k\cdot (10^{10}=\ln 0.7$

$k=3.566\times 10^{-11}$

At this Point we want to compute $t_{0.5}\ i.e.\ y=0.5$

$0.5=1-e^{-kt^n}$

$0.5=e^{-kt^n}$

$0.5=e^{-3.566\times 10^{-11}\cdot (t)^5}$

taking log both sides

$\ln 0.5=-3.566\times 10^{-11}\cdot (t)^5$

$t^5=1.943\times 10^{10}$

$t=114.2 min$

Rate of Re crystallization at this temperature

$t^{-1}=8.76\times 10^{-3} min^{-1}$

3 0

3 years ago

Calories tell you how much energy is in a food. True or False

IRINA_888 [86]

Answer:True. The number of calories in a food is a measure of how much potential energy that food possesses.

Explanation:

6 0

3 years ago

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Which of the following statements best summarizes the main points of the passage?

Deffense [45]

Answer:the summery is ...i really don't know the picture is blurry and I cant see can you make it clear?

Explanation:

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2 years ago

If your heart is beating at 76 beats per minute what is the frequency of your heart's oscillations

PSYCHO15rus [73]

That would be a frequency of 1.2666... beats per second. This can be phrased as your heart beats at 1.27 Hz.

4 0

3 years ago

A box is being pulled by two ropes. Eduardo pulls to the left with a force of 500 N, and Clara pulls to the right with a force o

sergejj [24]

Answer:

kinetic friction or something else

Explanation:

Draw a diagram to illustrate the problem, as shown below.

m = mass of the box, kg

mg = weight of the box, N, acting downward

Because of Newton's 3rd law, a normal force of N = mg acts upward on the box.

C = 200 N, the force applied by Clara, horizontally to the right

E = 500 N, the force applied by Eduardo, horizontally to the left.

Because E is greater than C, the box will move left.

The frictional force, F, will resist the initial motion. Its magnitude is

F = μN = μmg, where μ = kinetic coefficient of friction.

F acts horizontally to the right.

From the given table, we can conclude that

Normal force acting upward is correct

Tension by Eduardoacting left is correct.

Tension by Clara acting right is correct.

Kinetic friction acting left is Incorrect.

Gravity acting downward is correct.correct

Answer:

The direction of the kinetic friction force is incorrect

8 0

3 years ago