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Pavel [41]
3 years ago
6

A runner runs 480 m towards north on a straight track in 120 s and then walks back the same distance in 300 s. (Note: velocity a

nd speed are two different physical quantities)
(a) What is the average velocity for the first part of the motion?





(b) What is the average velocity for the second part (walking back) of the motion?





(c) Calculate his average velocity for the entire motion.
Physics
1 answer:
eimsori [14]3 years ago
8 0
Ask ur mom helmkemskaigsgai
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What is the kinetic energy of a 26 kg eagle flying at an altitude of 65 m at a speed of 19 m/s?
sweet [91]

Answer:

4693 J

Explanation:

The kinetic energy of the eagle is given by:

K=\frac{1}{2}mv^2

where

m is the mass of the eagle

v is the speed of the eagle

In this problem, m = 26 kg and v = 19 m/s. Substituting into the formula, we find

K=\frac{1}{2}(26 kg)(19 m/s)^2=4693 J

As we can see, the altitude of the eagle is not relevant for the calculation of the kinetic energy.

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In most cases, how many electrons does it take to completely fill the
Lyrx [107]

Answer: 2

Explanation:

Each shell can contain only a fixed number of electrons: The first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on. The general formula is that the nth shell can in principle hold up to 2(n2) electrons.

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A 32-cm-long solenoid, 1.8 cm in diameter, is to produce a 0.30-T magnetic field at its center. If the maximum current is 4.5 A,
daser333 [38]

Answer:

<h2>16,931 turns</h2>

Explanation:

The magnetic field produced is expressed using the formula

B = \frac{\mu_0NI}{L}

B is the magnetic field = 0.30T

I is the current produced in the coil = 4.5A

\mu_0 is the magnetic permittivity in vacuum = 1.26*10^-6Tm/A

L is the length of the solenoid = 32 cm = 0.32 m

N is the number of turns in the solenoid.

Making N the subject of the formula from the equation above;

B = \frac{\mu_0NI}{L}\\\\BL = \mu_0NI\\\\Dividing\ both\ sides \ by \ \mu_0I\\\\\frac{BL}{\mu_0I} =\frac{\mu_oNI}{\mu_0I} \\\\

N = \frac{BL}{\mu_0I}

Substituting the give values to get N;

N = \frac{0.3*0.32}{1.26*10^{-6} * 4.5}\\\\N = \frac{0.096}{0.00000567} \\\\N = 16,931.21

The number of turns the solenoid must have is approximately 16,931 turns

4 0
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What effect will a turning point have on an individuals life
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Answer:

The turning points are those instants, moments or situations that happen in an absolutely unexpected way, as a result of which your life changes ... and nothing is the same as before.

4 0
3 years ago
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The electrons involved in the formation of a chemical bond are called
tatiyna

Answer: Valence electrons

Valence electrons are those that are in the outermost or superficial layer of the atom, which means they have the highest energy compared to those of the inner layers.

Because of their position, it is easier for these electrons to interact with other atoms of their own element as well as different elements. This is done through the process of forming bonds when being attracted by other atoms.

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