The helium-filled balloons below are carrying negative electric charges, as shown. Attach two of the balloons to the hooks below to show what would happen if a red balloon and a blue balloon were brought near each other. Plzz help

Answer:

79.20 joule

Explanation:

1.

A 0.10kg stone is thrown from the edge of an ocean cliff with an initial speed of 21m/s. When it strikes the water below, it is traveling at 45m/s. What is the change in kinetic energy of the stone?

ΔEk = m/2*(V2^2-V1^2) = 0.05*(45^2-21^2) = 79.20 joule

The change in the kinetic energy of the stone is 81.25 J.

The given parameters;

The initial kinetic energy of the stone is calculated as follows;

K.E = ¹/₂mu²

K.E₁ = ¹/₂ x 0.1 x 20²

K.E₁ = 20 J

The final kinetic energy of the stone is calculated as follows;

K.E₂ = ¹/₂ x 0.1 x 45²

K.E₂ = 101.25 J

The change in the kinetic energy of the stone is calculated as follows;

ΔK.E = K.E₂ - K.E₁

ΔK.E = 101.25 J  -  20 J

ΔK.E = 81.25 J

Thus, the change in the kinetic energy of the stone is 81.25 J.

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Answer:

0.25m/s^2

Explanation:

F = ma

a = F/m

(Newton's Second Law)

Answer is:

A:The movement of large land areas across earth's surface

Answer:

True.

Explanation:

Newton's Second Law of Motion states that the acceleration of a physical object is directly proportional to the net force acting on the physical object and inversely proportional to its mass.

Mathematically, it is given by the formula;

Force = mass * acceleration

[tex] F = ma[/tex]

Centripetal acceleration is given by the formula;

[tex] Acceleration, a = \frac {v^{2}}{r}[/tex]

Where;

v is the velocity.

r is the radius.

The equation for centripetal force can be derived by substituting the equation for centripetal acceleration into Newton’s second law.

Let centripetal force be Fc

Fc = ma

Substituting the value of "a" into the above formula;

[tex] Fc = m \frac {v^{2}}{r} [/tex]

[tex] Fc = \frac {mv^{2}}{r} [/tex]

Answer: Most objects expand when they take in heat for example get a metal sphere and put it next to a blow torch it would expand just enough to not fit in the ring anymore, but when it cools down it will go back to its original size releasing the energy

Explanation:

Answer:

c

Explanation:

Answer:

Explanation:

When the object falling attains terminal velocity , net force on it becomes zero. That means drag force becomes equal and opposite to its weight.

So drag force = mg

where m is mass of falling body and g is acceleration due to gravity .

The drag force is constant . It is doing work against the weight of falling body . Object is falling v m /s . That means drag force is doing work per second as follows

Work done per second = force x displacement per second

= mg x v

So

Power of drag force = mgv.

Pd = mgv.

Answer:Hope this helps!!!!!

Explanation:

People are fascinated with high-speed travel. A Boeing 747 flies at about 550 miles per hour. The Concorde Supersonic Transport flew over twice as fast at about 1350 miles per hour. That is impressively fast, but consider the speeds that we passengers on planet Earth always travel. The circumference of the Earth at the equator is 24900 miles and the residents of the tropic areas travel that distance every 24 hours. They are traveling over a thousand miles an hour. At 38° latitude we are traveling about 820 miles per hour. That is quite impressive but it pales in comparison with the orbital speed of the Earth, The average distance of the Earth from sun is 93.5 million miles. This means that in 365.25 days the Earth travels 587.5 million miles. This works out to about 67 thousand miles per hour. This is the speed we travel 24 hours a day, 365.25 days a year.

The orbital velocity is 2πR/T where R is the average radius of the orbit and T is the length of the year. The orbital velocity of a planet relative to that of Earth's is then the relative radius divided by the relative length of the year.

Answer:

F = 120 N

Explanation:

Given that,

The mass of a runner, m = 60 kg

Acceleration of the runner, a = 2 m/s²

We need to find the force provided from her legs. The formula for force is given by :

F = ma

Substitute all the values,

F = 60 kg × 2 m/s²

= 120 N

So, the required force is equal to 120 N.

Given:

Mass,

Acceleration,

As we know that,

→ [tex]Force = Mass\times Acceleration[/tex]

or,

→ [tex]F = ma[/tex]

then,

      [tex]= 60\times 2.0[/tex]

      [tex]= 120\ N[/tex]

Thus the above answer is right.

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I found this formula in an old book.

E = m · c²

It may be useful.

c = 3 x 10⁸ m/s

c²  = 9 x 10¹⁶ m²/s²

4 x 10¹⁶ J = m · (9 x 10¹⁶ m²/s² )

m = (4 x 10¹⁶ J) / (9 x 10¹⁶ m²/s²)

m  =  0.44 kg (choice-B)  

Answer:

The two defining characteristics of a stem cell are perpetual self-renewal and the ability to differentiate into a specialized adult cell type.

Answer:

Stem cells have the ability to differentiate into specific cell types. The two defining characteristics of a stem cell are perpetual self-renewal and the ability to differentiate into a specialized adult cell type.

Answer: 3.0 m/s

Explanation:

Answer:

yes

Explanation:

of course indeed correct

The purpose of the antireflective coating on the glass layer of a solar

the cell is that It allows more solar energy to be absorbed, therefore the correct answer is option D.

The energy emitted by the Sun as a form of thermal electromagnetic radiation is known as solar energy.

This solar energy is produced by nuclear fusion in the center of the Sun. Solar energy is a form of renewable source of energy.

As given in the problem statement we have to find out the best statement from the given options which describes the purpose of the antireflective coating on the glass layer of a solar cell.

In order to increase the amount of solar energy that can be absorbed, a solar cell's glass layer has an anti-reflective coating, therefore the correct answer is option D.

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Answer:

D

Explanation:

Answer:

35520

Explanation:

592 times 60=35520

A. The fossils cam from the same organism

Hope this helps!

The fossils came from the same organism. This conclusion is most reasonable.

A fossil is an item that has survived in the Earth's crust as a remnant, impression, or trace of an extinct animal or plant. The main repository for knowledge regarding the evolution of life on Earth is the complex of information preserved in fossils found all across the world.

Fossils of dinosaurs discovered in Alberta, Canada. Only a small percentage of extinct species have been preserved as fossils, and often only those with a sturdy skeleton are capable of doing so. A calcareous skeleton or shell is present in the majority of major groups of invertebrate creatures (e.g., corals, mollusks, brachiopods, bryozoans). Other types have silicon dioxide or calcium phosphate shells (both of which are found in the bones of vertebrates).

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Answer:

140.8/2.54=55.43 inches

Answer:

Newton's first law of motion states that an object's motion will not change unless an unbalanced force acts on the object. ... The football player in the photo above is in motion. He will stay in motion unless players on the other team exert an unbalanced force against him.

Explanation:

https://flexbooks.ck12.org/cbook/ck-12-middle-school-physical-science-flexbook-2.0/section/1.4/related/rwa/football-physics/

LINK

Answer:

54.55 m/s

Explanation:

From the question above,

Change in velocity = impulse/mass

Δv = I/m = Ft/m................... Equation 1

Where F = force, t = time, m = mass

Given: F = 20 N, t = 30 s, m = 11 kg

Substitute these values into equation 1

Δv = (20×30)/11

Δv = 600/11

Δv = 54.55 m/s

Hence the change in velocity of the body is 54.55 m/s

The change in velocity of the body is 54.54 m/s

The velocity of the body of an object is the change of the distance of the object with time.

From the information given:

the mass of the b0dy = 11 kg

the net force F = 20 N

the time (t) = 20 s

Similarly;

Force = ma

20 = 11 ×  (a)

[tex]\mathbf{a = \dfrac{20}{11} \ m/s^2}[/tex]

a = 1.818 m/s²

However, the acceleration of an object is the change in velocity with time.

[tex]\mathbf{a = \dfrac{\Delta V}{t}}[/tex]

ΔV =  (a) ×  (t)

ΔV = 1.818 m/s² × 30 s

ΔV = 54.54 m/s

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Complete question is;

Describe how α-radiation is similar to β-radiation?

Answer:

Explained below

Explanation:

The similarity between both alpha radiation and beta radiation is that in both cases, they both show deflection when they go through electric and magnetic fields. Although alpha deflects towards the negative plate while bets deflects towards the positive plate.

Secondly they both have high speeds. Just that alpha is from the helium nucleus while beta is from electrons.

Answer:

-0.0789 m

Explanation:

Recall that the y-component comes associated with the sin(18.4) through the following trigonometric relationship:

y = 0.250 sin(-18.4) ≈ -0.0789 m

Notice it is negative since it is below the x-axis.

Answer:6

Explanation:$’n

Answer:

D) conduction

Explanation:

Answer:

D

Explanation:

heat is an energy that transfers from a hot body to cold body

D. Heat

Heat is the transfer of kinetic energy from one medium or object to another, or from an energy source to a medium or object.

Such energy transfer can occur in three ways: radiation, conduction, and convection.

As heat is a form of energy, and therefore the SI unit of heat is also joules (J) which are defined as the amount of energy needed to raise the temperature of a given mass by one degree.

Heat is the transfer of energy from a warmer object to a cooler object.

For example, a lighted match (higher temperature object) will transfer heat to a large pan filled with lukewarm water (lower temperature object).

Therefore,

The term describes the transfer of energy from a hot object to a cooler one is Heat.

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Answer:

I do believe the answer is D. prism

Answer:

Explanation:

either all of the above or D <3