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Please can I have some help with these questions? Many thanks!

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.

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Answer:

true, since science does not believe and agree to the supernatural.

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:

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.

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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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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CQ

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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?

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

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:

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:

"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.

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:

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:

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

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:

90 degrees...

Explanation:

Hope this helps you!!!

#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

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:

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

[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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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:

550 m/s

Explanation:

Speed of wave = wl * f      wl = 1,25 m    f = 440 Hz  (given)

                          1.25 m * 440 = 550 m/s

Answer:

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

Answer:

Mariner 10 in 1974 and 1975

Explanation:

Answer:

248 years

Explanation:

The last time this happened was from 1979 to 1999. It won't happen again until 2227.

53....................................

Explanation:

Answer:

0,352kg*m²

Explanation:

I=m*R²

i=2,2kg*0,4m*0,4m=0,352kg*m²

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.