A negatively charged rubber rod was brought near some small pieces of paper. The rod’s charges repelled the
negative charges in the pieces. Which of the following caused the repulsion of the negative charges?
a. conduction b. insulation c. induction d. friction

____ 12. The diagram below shows two aluminum spheres.

Aluminum sphere A contains a small negative charge and is touched by aluminum sphere B, which has a
larger negative charge. Which of the following occurs next?
a. Protons flow from sphere B to sphere A.
b. Protons flow from sphere A to sphere B.
c. Electrons flow from sphere B to sphere A.
d. Electrons flow from sphere A to sphere B.

____ 13. Most electrical wires are covered with plastic or rubber. The wires are covered with plastic or rubber because

those materials
a. are conductors of electricity. c. are not conductors of electricity.
b. make complete electric circuits. d. make the electricity move quickly.

____ 14. The loss of static electricity as electric charges transfer from one object to another is called

a. friction. b. conduction. c. induction. d. static discharge.

Answer:

methylated spirit is in fact methanol added to ethanol (usually 10% methanol is used). The liquid evaporates which means that the liquid converts to a gaseous state. This process requires energy which it extracts from your body in the form of heat.

Explanation:

Answer:

F = M a = Ff     force of friction

Ff = μ M g = μ W         where M g = weight of glass

The problem gives the kinetic friction as a force (Ff) in Newtons

μ = Ff / W = .175 / .500 = .35

Answer:   this was the answer you were looking for -

Explanation

Answer:

0,352kg*m²

Explanation:

I=m*R²

i=2,2kg*0,4m*0,4m=0,352kg*m²

For a merry go round with a radius of R=1.8 m and moment of inertia I=184 kg-m^2 is spinning with an initial angular speed of w=1.48 rad/s   is mathematically given as

F= 618.9 N

Generally, the equation for the angular speed  is mathematically given as

w = v/R

Therefore

w= 4.7/1.8

w= 2.611 rad/s

Where total momentum

Tm= 642.96 + 272.32

Tm= 915.28

and total inertia

Ti= 184 + 246.24

Ti= 430.24

In conclusion, centripetal force

F= mrw^2

F = m*R*w2^2

F = 76*1.8*2.127^2

F= 618.9 N

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a merry go round with a radius of R=1.8 m and moment of inertia I=184 kg-m^2 is spinning with an initial angular speed of w=1.48 rad/s in the counter clockwise direction when viewed from above a person with mass m=76 kg and velocity v=4.7 m/s runs on a path tangent to the merry go round once at the merry go round the person jumps on and holds on to the rim of the merry go round angular speed of the merry go round after the person jumps on 2.127 rad/s Once the merry go round travels at this new angular speed with what force does the person need to hold on?

The change in the momentum of the object moving along a straight line is determined as 3 Ns.

The change in the momentum of the object is equal to impulse received by the object.

The impulse received by the object is determined from the product of force and time of action.

J = Ft

Ft() = kt + τ

at time 0 s

Ft(0) = 1(0) + 1

Ft(0) = 1 Ns

at time , t = 3 s

Ft(3) = 1(3) + 1

Ft(3) = 4 Ns

Change in momentum from 0 s to 3 s, =  4 Ns - 1 s = 3 Ns

Thus, the change in the momentum of the object moving along a straight line is determined as 3 Ns.

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Answer:

Here is the answer for the question

Mass is increased and power is constant, so increase in potential energy of mass is also greater.

The labor required to move an object into a position is equated with the potential energy. For instance, if you were to pick up a book and set it down on a table.

Elastic  When materials stretch or contract, elastic potential energy is stored. Spring, rubber band, and slingshot motions are a few examples of elastic potential energy.

Electric - The ability to perform labor depending on an object's electric charge is known as electric potential energy. Nuclear: The atom's internal particle potential energy. Chemical potential energy is the energy held in chemicals.

Therefore, Mass is increased and power is constant, so increase in potential energy of mass is also greater.

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Answer:

When an atom is unstable it will change into a new atom

[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]

Here we go ~

As we have been given, The spring of spring constant " m " was cut to form 2 new springs in ratio of 5 : 3.

we have to find out the spring constant of the longer spring which was formed, and it's given that spring constant of the main spring was " m "

Now, let the length of main spring be " l "

So, lengths of the resultant springs will be :

[tex]\qquad \cal \dashrightarrow \: \dfrac{5l}{8} \: \: and \: \: \dfrac{3l}{8} \: \: \: \: respectively[/tex]

And we know that spring constant is inversely proportional to length of spring so, we infer that :

[tex]\qquad \cal \dashrightarrow \: m\propto \dfrac{1}{l} m \: \: \: \: \: - (1)[/tex]

where, m is spring constant of main spring and l is its length.

[tex]\qquad \cal\dashrightarrow \: m_1 \propto \dfrac{8}{5l} \: \: \: \: \: \: \: - (2)[/tex]

where, m1 is spring constant of longer spring, and 5l/8 is its length.

let's divide (2) by (1), we will get ~

[tex]\qquad \cal \dashrightarrow \: \dfrac{m_1}{m} = \dfrac{8}{5l} \div \dfrac{1}{l} [/tex]

[tex]\qquad \cal \dashrightarrow \: \dfrac{m_1}{m} = \dfrac{8}{5l} \times \dfrac{l}{1} [/tex]

[tex]\qquad \cal \dashrightarrow \: \dfrac{m_1}{m} = \dfrac{8}{5} [/tex]

[tex]\qquad \cal \dashrightarrow \: {m_1}{} = \dfrac{8}{5} m [/tex]

So, the spring constant of equivalent longer strong formed will be 8/5 m

prove:

[tex]m_2 = \frac{8m}{5} [/tex]

Explanation:

Given:

Spring constant of spring= m

The ratio of spring = 5:3

To find:

spring constant of the larger piece of spring?

Solution:

Let the length of larger piece L2 be 5x and smaller piece L1 be 3x with spring constant m2 and m1 respectively.

now,

spring constant (m) inversely proportional to the length of spring i.e.

[tex]m \propto \: \frac{1}{l} {,}\: m_1 \propto \: \frac{1}{l_1} {,}\: m_2 \propto \: \frac{1}{l_2}[/tex]

Also,

The spring is connected in series hence,

[tex] \frac{1}{m} = \frac{1}{m_1} + \frac{1}{m_2} [/tex]

and

[tex] \frac{m_1}{m_2} = \frac{l_2}{l_1} \\ {m_1} = {m_2} \cdot \frac{l_2}{l_1} \\ {m_1} = {m_2} \cdot \frac{5}{3} \\ [/tex]

Substituting above value in,

[tex] \frac{1}{m} = \frac{1}{m_1} + \frac{1}{m_2} \\ \frac{1}{m} = \frac{1}{{m_2} \cdot \frac{5}{3}} + \frac{1}{m_2} \\ \frac{1}{m} = \frac{3}{5m_2} + \frac{1}{m_2} \\ \frac{1}{m} = \frac{3m_2 + 5m_2}{5 {m_2}^{2} } \\ \frac{1}{m} = \frac{8m_2}{5 {m_2}^{2} } \\ \frac{1}{m} = \frac{8 \cancel {m_2}}{5 \cancel{m_2}^{2} } \\ \frac{1}{m} = \frac{8}{5m_2} \\ m_2 = \frac{8m}{5} [/tex]

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The change in the temperature of the pan of water on the Kelvin and Fahrenheit scales is 328.15K and 131°F respectively.

Temperature scale is simply the methodology of calibrating the physical quantity of temperature.

There are 3 main temperature scales, namely; Celsius, Fahrenheit, and Kelvin.

The expression for conversion are;

Given the data in the question;

First we determine the change in temperature.

ΔT = Final temperature - Initial temperature

ΔT = 78°C - 23°C

ΔT = 55°C

The change in temperature on the Kelvin scale

ΔT = 55°C = 55°C + 273.15 = 328.15K

The change in temperature on the Fahrenheit scale

ΔT = 55°C = (55°C × 9/5) + 32 = 131°F

Therefore, the change in the temperature of the pan of water on the Kelvin and Fahrenheit scales is 328.15K and 131°F respectively.

the change in the temperature of the pan of water on the Kelvin and Fahrenheit scales is 328.15K and 131°F respectively.

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All of the above-mentioned symptoms of cognitive stress except for isolation. Option d is correct.

Mental (cognitive) stress is an emotional/physical strain that causes a person to feel irritated, depressed, angry, anxious, and so on.

Cognitive stress is marked by a variety of moods and/or emotions linked to excessive anxiety about money, overall health, job loss, and so on.

All of the above-mentioned symptoms are markers of cognitive stress. In some circumstances, this condition may exacerbate stress.

Loss of memory, loss of concentration, and poor judgment are symptoms that are markers of cognitive stress.

Social isolation has been linked to a variety of mental illnesses, including increased stress, despair, and anxiety.

Hence all of the above-mentioned symptoms of cognitive stress except isolation. Option d is correct.

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Answer:

D

Explanation:

Answer:

90 degrees...

Explanation:

Hope this helps you!!!

For a piece of machinery with a moment of inertia of 2.5 kg-m, new angular speed is mathematically given as

wf= 2.857 rad/s

Generally, the equation for the final angular speed  is mathematically given as

wf =  wi*(I1/I2)

Therefore

wf = 4.0*(2.5/3.5)

wf= 2.857 rad/s

In conclusion, the new angular speed

wf= 2.857 rad/s

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Answer:

False

Explanation:

Light refracts whenever it travels at an angle into a substance with a different refractive index (optical density).

Answer:

Heat capacity is the amount of heat required to raise the temperature of an object by 1oC. The specific heat of a substance is the amount of energy required to raise the temperature of 1 gram of the substance by 1oC.

Explanation:

The answer is above.

Answer: The first option

Explanation: common sense

The Moon always rotates about the Earth in its orbit. The position of the Earth, moon and sun during a new moon is Earth is in between Sun and Moon.

When moon has travelled for 14 days, it starts its journey again for the next 14 days. The journey starts from the new moon to the full moon. The position of new and full moon is the same. At this time, the Earth is in between the Sun and the Moon.

Thus, the position of the Earth, moon and sun during a new moon is Earth is in between Sun and Moon.

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Sounds are created when something vibrates (shakes back and forth), sending waves of vibrations into the ears of the listener. When a bell is struck, the metal vibrates. The vibrations travel through the air as sound waves.

hope this helps

Answer:

Dietary carbohydrates provide the body with energy for tough workouts and replenish energy stores in muscles in the form of glycogen.

Explanation:

Answer:

If he throws the ball with speed V then     (vertical speed)

V / g     is the time to reach maximum height    (V2 - V1) / a

The total time to again reach the ground is then

T = 2 V / g

H = 1/2 g t^2     where t = V / g

H = 1/2 g (V / g)^2 = V^2 / (2 g)

This is the familiar formula

V = (2 g H)^1/2      for the initial upwards speed

Answer:

Radiation travels by Waves!!

Explanation:

BONUS:Thermal radiation is a longitudinal wave.

Hope this helped

Answer:

Radiation transfers   energy by  ⇒ electromagnetic  waves. These waves transfer energy from a warmer object to a cooler object, with or without  ⇒ matter .

Explanation:

edge2022

Answer:

"total" resistance

The current will have the option of going thru more than 1 resistor so the total resistance of the circuit will be less than any resistance in the circuit.

#1

#2

No it happens opposite as heat transfers from high to low

#3

#4

No it can't be happened in vaccum

#5

#6

Faster the movement faster the heat transfer

#7

Light particles get transferred from low to high (sun light)

#8

#9

Answer:

Mariner 10 in 1974 and 1975

Explanation:

Answer:

gravity is changed by a factor of 10/16

Explanation:

gravitational force =  m1 m2 G / r^2    now change the m1  and  r

                               = 10 m1 m2 G/ (4 r)^2

                               = 10 /16  m1 m2 G / r^2

10 /16  the earth's gravity

Answer:

Depolarization causes the Voltage-gated channels to open in order for ions to flow or rush in

Answer:

4.27m

Explanation:

force on moving charge= qvBsin$

centripetal force=mv^2/r

since the forces are equal

mv^2/r=qvBsin$

r= (mv^2)/(qvBsin$) = mv/qBsin$

r-radius

m-mass of an electron

q-charge on electron

v-velocity of the electron

B-field strength

$ - angle

r= ((9.1093837 ×10^-31)kg × 7.50 × 10^6 m/s)/(1.6×10^-19C×10^-5T×sin90) = 4.27m

Answer:

C) 14 m/s

Explanation:

First step is to work out the centripetal acceleration of Car A. The equation for centripetal acceleration is:

a = v^2 / r

So we substitue in the value given for Car A's speed and get:

a = (10)^2 / r

a = 100 / r

We know that Car B has twice the centripetal acceleration of Car A, or 2a, therefore:

2a = 2 ( 100 / r ) = 200 / r

Now we know the centripetal acceleration of Car B! Last step: we use a = v^2 / r to find the velocity of Car B:

a = v^2 / r

200 / r = v^2 / r (r's cancel)

v^2 = 200

v = 14.1 m/s

Hope that helped! Sorry, I have no idea how to use the equation tool.

Answer:

For the displacement of charge

Explanation:

When the vehicle is in motion,due to friction in air,the body of the vehicle gets charged. if accumulated, charge becomes excessive,sparking May occur and inflammable materials may catch fire. therefore metallic chains touching the ground are introduced so that the charge quickly leaks to the earth.