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3 years ago

HELP ME ASAP ITS PHYSICS AND it’s finding the kinetic energy SHOW WORKKK

Physics

2 answers:

lord [1]3 years ago

6 0

k = 1/2 × m × v^2

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1. k = 1/2 × 60 × ( 10 )^2

k = 30 × 100

k = 3000 j

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2. k = 1/2 × 60 × ( 9 )^2

k = 30 × 81

k = 2430 j

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3. k = 1/2 × 60 × ( 4 )^2

k = 30 × 16

k = 480 j

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4. k = 1/2 × 60 × ( 6 )^2

k = 30 × 36

k = 1080 j

______________________________

5. k = 1/2 × 60 × ( 0 ) ^2

k = 30 × 0

k = 0 j

asambeis [7]3 years ago

3 0

the ans is like this

1 4

2 5

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Two tiny conducting spheres are identical and carry charges of -19.8μC and +40.7μC. They are separated by a distance of 3.59 cm.

romanna [79]

Answer:

(a): $\rm -5.627\times 10^3\ N.$

(b): $\rm 7.626\times 10^2\ N.$

Explanation:

<u>Given:</u>

Charge on one sphere, $\rm q_1 = -19.8\ \mu C = -19.8\times 10^{-6}\ C.$

Charge on second sphere, $\rm q_2 = +40.7\ \mu C = +40.7\times 10^{-6}\ C.$
Separation between the spheres, $\rm r=3.59\ cm = 3.59\times 10^{-2}\ m.$

Part (a):

According to Coulomb's law, the magnitude of the electrostatic force of interaction between two static point charges is given by

$\rm F=k\cdot\dfrac{q_1q_2}{r^2}$

where,

k is called the Coulomb's constant, whose value is $\rm 9\times 10^9\ Nm^2/C^2.$

From Newton's third law of motion, both the spheres experience same force.

Therefore, the magnitude of the force that each sphere experiences is given by

$\rm F=k\cdot\dfrac{q_1q_2}{r^2}\\=9\times 10^9\times \dfrac{(-19.8\times 10^{-6})\times (+40.7\times 10^{-6})}{(3.59\times 10^{-2})^2}\\=-5.627\times 10^3\ N.$

The negative sign shows that the force is attractive in nature.

Part (b):

The spheres are identical in size. When the spheres are brought in contact with each other then the charge on both the spheres redistributes in such a way that the net charge on both the spheres distributed equally on both.

Total charge on both the spheres, $\rm Q=q_1+q_2=-19.8\ \mu C+40.7\ \mu C = 20.9\ \mu C.$

The new charges on both the spheres are equal and given by

$\rm q_1'=q_2'=\dfrac Q2 = \dfrac{20.9}{2}\ \mu C=10.45\ \mu C = 10.45\times 10^{-6}\ C.$

The magnitude of the force that each sphere now experiences is given by

$\rm F'=k\cdot \dfrac{q_1'q_2'}{r^2}'\\=9\times 10^9\times \dfrac{10.45\times 10^{-6}\times 10.45\times 10^{-6}}{(3.59\times 10^{-2})^2}\\=7.626\times 10^2\ N.$

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3 years ago

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solniwko [45]

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2 years ago

Suppose that Lisa walks her dog around the block for a little exercise. The block is 1 mile around. If she walks around the bloc

natita [175]

Displacement only measure how far between the starting and ending point. In this case, Lisa walks around the block as a circle so the starting point is the same as the ending point. Thus, displacement is 0mile.
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3 years ago

A 3.0 kilogram object is thrown upward with an initial speed of 10 meters per second. what maximum height will the object reach?

tino4ka555 [31]

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4 years ago

BRAINLIEST!

Vlada [557]

The two tests used for measuring each of the following fitness areas are as follows:

a) Cardiorespiratory fitness → The 2.4 km run test; Astrand treadmill test

b) Muscle strength → Muscle Testing Scale, Bench/Leg press

c) Body Composition → DEXA Scan, Bioelectrical Impedance Analysis

Cardiorespiratory fitness is the ability of the circulatory as well as the respiratory systems to deliver oxygen to the mitochondria of skeletal muscle for energy generation during physical activity.

Cardiorespiratory fitness is a vital indicator of both physical and mental wellbeing. It can lower the chance of developing heart disease and type 2 diabetes. Cardiorespiratory fitness improves lung and heart health while also increasing emotions of well-being.

The astrand treadmill test is used widely for testing the fitness of cardiorespiratory. The usefulness of this test is used to assess a client's aerobic fitness.

The 2.4 km run test is an uncomplicated running test that needs the use of a stopwatch and a running track. It is widely used for aerobic fitness

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The test used to determine the muscle strength can be:

Muscle Testing Scale;
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The test used to determine the body Composition can be:

DEXA Scan
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Dexa Scan scans your body using x-ray technology to offer a thorough evaluation of the amount of muscle mass and fat mass your body contains, as well as where fat and muscle are deposited or stored on your body.

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Therefore, from the above explanations, we can conclude that we've clearly understood the various test for each fitness area.

Learn more about body fitness here:

brainly.com/question/10033432?referrer=searchResults

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3 years ago