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lesya692 [45]
3 years ago
14

When heating water, during what temperature range will the temperature cease to change for some time?

Physics
2 answers:
fgiga [73]3 years ago
7 0
The correct answer would be B.) 98°c-102°c
Alexandra [31]3 years ago
3 0

Answer : The correct option is, (B) 98^oC-102^oC

Explanation :

The boiling point of pure water is 100^oC. And the boiling point of water is lie between the range of the given option (B) 98^oC-102^oC.

At the boiling point of water, the phase of water changes from liquid to vapor.

Hence, the correct option is, (B)

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A student is swimming south applying a force of 256 N. The water exerts a westward force of 104 N. If the student has a mass of
grigory [225]

Answer:

a=2.9\ m/sec^2

Explanation:

<u>Net Forces and Acceleration</u>

The second Newton's Law relates the net force F_r acting on an object of mass m with the acceleration a it gets. Both the net force and the acceleration are vector and have the same direction because they are proportional to each other.

\vec F_r=m\vec a

According to the information given in the question, two forces are acting on the swimming student: One of 256 N pointing to the south and other to the west of 104 N. Since those forces are not aligned, we must add them like vectors as shown in the figure below.

The magnitude of the resulting force F_r is computed as the hypotenuse of a right triangle

|F_r|=\sqrt{256^2+104^2}

|F_r|=276.32\ Nw

The acceleration can be obtained from the formula

F_r=ma

Note we are using only magnitudes here

\displaystyle a=\frac{F_r}{m}

\displaystyle a=\frac{276.32Nw}{95.3Kg}

\boxed{a=2.9\ m/sec^2}

7 0
3 years ago
A satellite dish is shaped like a paraboloid of revolution. This means that it can be formed by rotating a parabola around its a
pentagon [3]

Answer:

Explanation:

Given dish width= 48ft

Depth = 4ft

Using equation of a parabola

x²= 4py

48² = 4p 4

4p = 576

P= 144ft

Thus the the receiver should be placed 144ft from t the vertex

7 0
3 years ago
What is thermal conductivity?
Vladimir79 [104]
Thermal conductivity is the ability of a material to conduct heat.
hope this helped:)
3 0
3 years ago
In 10 seconds a car accelerates 4m/s^2 to 50
DanielleElmas [232]

Answer:

10m/s

Explanation:

using the formula a=v-u

t

4 0
2 years ago
1.- An elevator is being lowered at a constant speed by a steel cable attached to an electric motor. Which statement is correct?
Nady [450]

Answer:

the correct one is C

Explanation:

For this exercise we must use the work definition

    W = F. s

Where the bold characters indicate vectors and the point is the scalar producer

    W = F s cos θ

Where θ is the angles between force and displacement.

Let us support this in our case. The cable creates an upward tension and with the elevator going down the angle between them is 180º so the work of the cable on the elevator is negative.

The evade has a downward force, its weight so the force goes down and the displacement goes down, as both are in the same direction the work is positive

When examining the statements the correct one is C

4 0
3 years ago
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