Physics Help ASAP Please!

Answer:

10.2 km

Explanation:

Displacement is the shortest distance from your original position after movement.

Now, the Zambeef delivery truck moves 18 km north and then 10 km east and then 16 km south.

This means that vertically the truck is 2km short of the 18 km he travelled north..

So we can find the displacement using pythagoras theorem..

Let d be the distance from the current position to the initial position.

Thus;

d² = 2² + 10²

d² = 4 + 100

d = √104

d ≈ 10.2 km

I have attached a diagram showing the direction of this displacement

Answer:

c

Explanation:

Answer:The skater has the lowest amount of kinetic energy at the top of the track and lowest potential energy at the lowest point of the track. Kinetic energy is the speed a object is going, and potential energy is the energy a object has when its not moving. While the skater moves up the ramp the potential energy increases, and the kinetic energy decreases because it slows down while moving up the ramp. Hope this helps have a nice day ❤️

Explanation:

First recognize that the total energy of the skater is conserved: this means that the total energy of the skater is constant. The total energy (E) consists of the kinetic energy (KE) and gravitational potential energy (Ug).

E=KE+Ug

Now we know that the gravitational potential energy depends on the distance from the zero of potential (or in simpler terms: how high the skater is from the ground). Now, we are ready to answer the question.

The skater possesses the most KE at point B: remember total energy is a constant and at point B the skater has the least amount of potential energy (since they are at their lowest point above the ground). This means that the skater must have more kinetic energy at point B.

Similarly, at points A and C, the skater possesses the most potential energy since they are at their highest point above the ground.

As the skateboarder moves then it will have the maximum kinetic energy at the lower most portion of the track and will have the zero potential energy at the same point and at the maximum height of the track the skater will have maximum potential energy and zero kinetic energy.

As the skater moves on the track his kinetic and potential energy converts into each other but the total energy remains constant.

Total Energy = KE+PE

At maximum height the kinetic energy will totally convert into the potential energy and becomes zero.and the potential energy becomes maximum at this point.

At Max height (Total energy=Max Potential energy)         KE=0

Similarly at the lower most portion of the track the Potential energy completely convert into the kinetic energy and becomes zero. And kinetic energy becomes max at this point.

At lower point  (Total energy= Max Kinetic Energy)         PE=0

Thus the skater will have the most kinetic energy at the lower most point of the track and least potential energy at the same point.

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Answer:

35520

Explanation:

592 times 60=35520

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:

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:

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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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:

Magnetic induction cannot be done in a wood because it is not a magnetic person like iron , nickel,and cobalt

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

Answer:

C    Don't worry if you thought it was D. I almost answered that.

Explanation:

Remark

You can get this just by learning the vocabulary.

Efficiency = Work Out / Work In * 100%

Work in = 30J      That's you swinging the hammer.

Work out = 10 J    That's how much of the hammer's work gets to the nail.

Efficiency = (10/30)*100

Efficiency = 1/3 * 100

Efficiency = 33%

Answer:

I think its 40%, pls correct me if I am wrong :(

Explanation:

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:

yes

Explanation:

of course indeed correct

Answer:

0.25m/s^2

Explanation:

F = ma

a = F/m

(Newton's Second Law)

Answer:

A: 0.83 Hz

Explanation:

Frequency can be calculated in a multitude of ways. The one way that is going to help you solve this problem is (# of times/seconds)

so you would divide 85 swings/102 seconds

= 5/6 or 0.8333 Hz

so your answer is A

Answer:

140.8/2.54=55.43 inches

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.

To learn more about solar energy here, refer to the link given below;

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Answer:

D

Explanation:

Answer:

False

Explanation:

The mass of an object is normally known as the weight of the object. but mass is the amount of matter in the object. Weight is the force exerted on an object by gravity

Answer: False

Explanation: mass is the amount of matter in an object

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]

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:

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:

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/

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