A skateboarder, starting from the top of a ramp 4,5 m above the ground, skates down the ramp. The mass of the skateboarder and his board is 65 kg

Answer:

Zero

Explanation:

Acceleration is defined as the rate of change in speed. The speed during the first second is 9m/1s = 9m/s. During the second second is again 9m/1s = 9m/s and again 9m/s for the third second. Being the speed the same, the acceleration is 0

Answer:

2400m/s , 2240,2080,1920m/s

Answer:

Centripetal acceleration = 46.26m/s2

Tension = 4.6N

Explanation:

Centripetal acceleration is given by the following formula: [tex]a_c = \frac{v^2}{r}[/tex]

So, to calculate acceleration we first need velocity and radius.

The radius is given to us as 75cm = 0.75m, and we can find velocity from the following formula:[tex]v=r\omega[/tex] where w = the angular velocity given by: [tex]\omega = \frac{2\pi}{T}[/tex]

We are given a period of 0.80s, meaning that our angular velocity is:

[tex]\frac{2\pi}{0.80} = 7.85 rad s^{-1}[/tex]

Now we just need to multiply is by the radius to find the velocity:

[tex]0.75*7.85=5.89ms^{-1}[/tex]

Finally we square the velocity and divide by the radius to find the final centripetal acceleration: [tex]\frac{5.89^{2} }{0.75} =46.26ms^{-2}[/tex]

[tex]F=\frac{mv^{2} }{r}[/tex] so we just need to multiply the centripetal acceleration by mass to get the tension force of the string: [tex]46.26*0.1 = 4.6N[/tex]

Hope this helped!

By Newton's third law, we will see that the force that block A exerts on block B is equal in magnitude but in opposite direction than the force that block B exerts on block A.

Remember that Newton's third law says that whenever two objects interact, they exert equal and opposite forces on each other.

The force that block B exerts on block A is equal to block B's weight, which is:

[tex]W_b = 0.05kg*9.8m/s^2 = 0.49 N[/tex]

Then the force that block A exerts on block B is equal in magnitude but in opposite direction, thus it will be equal to:

F' = -0.49N

Then the diagram is the one that you can see below.

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Answer:

reactants --> products + thermal energy

Explanation:

Heat is absorbed in endothermic reaction.

Answer:

Alice works with natural rubber and Julio works with vulcanised rubber.

Explanation:

Answer:

B. Alice works with natural rubber, and Julio works with vulcanized rubber.

Explanation:

I just took the test and got 100 percent.

I hope this helps you!!!!

Please mark my answer the Brainiset. Thank You!!!!!

Answer:

I asked the same question

Answer:

B

Explanation:

Elements are made up of one type of atom only

Answer:

A

Explanation:

Answer:

I think it's true,,

Explanation:

maybeee truee

Answer:

"H" is a chemical symbol and "H2" is chemical formula.

The acceleration of the car over the 2 minutes is 0.07 m/s².

The acceleration of an object is the rate of change of velocity of the object with time.

The acceleration of the car over the 2 minutes is calculated as follows;

a = Δv/t

a = (v - u) / t

where;

a = (22.22 - 13.89) / 120

a = 0.07 m/s²

Thus, the acceleration of the car over the 2 minutes is 0.07 m/s².

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Answer:

Given equation

[tex]\\ \sf\longmapsto Zn+HCl\longrightarrow ZnCl_2+H_2[/tex]

Balanced equation

[tex]\\ \sf\longmapsto Zn+2HCl=ZnCl_2+H_2[/tex]

Reactant side:-

Product side:-

Hence balanced

Answer:

1 2 1 1

Explanation:

Answer:

its A

Explanation:

took the test

In essence, this means that planets do not travel along their orbits at a constant speed. Instead, they move at different speeds so that the line connecting the centres of the Sun and the planet covers the same amount of ground in equal amounts of time. Thus, option A is correct.

The law of areas is Kepler's second law of planetary motion. A line drawn between a planet and the Sun is said to cover equal areas in an equivalent amount of time according to this law.  

The velocity of a planet as it travels along its elliptical course is described by Kepler's Second Law. An elliptical object will cover equal amounts of space in a same amount of time if a line is drawn from the sun to the planet. This implies that the planet moves more slowly away from the sun and faster toward it.

Therefore, at equal times, the planet must cover a wider arc when it is nearer the Sun than when it is farther away.

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3SPJ2

=> Flexibility is the ability of a joint or series of joints to move through an unrestricted, pain free range of motion.

Answer:

motion of molecules

Explanation:

I believe that is true

Answer:

its in this order 2,1,1

Explanation:

trust me bro

Answer:

221 is the actual answer

Explanation:

dont trust the person above me

Answer:

The rocket travelled 37km per minute

Explanation:

185÷5=37

Answer: decreases by 7.5

Explanation:

Answer:

161

Explanation:

[tex]v=\frac{d}{t}[/tex] slove for t

[tex]t=\frac{d}{v}[/tex]

Insert values of d and v

[tex]t=\frac{483}{3} \\[/tex]

t=161

Answer:

hahaha bisa aja ente gan di download di sini adalah salah satu

Am guessing;

9/4 × 60/1 =135

Answer:

1. The magnetic pole is the region at each end of a magnet where the external magnetic field is the strongest.

2. magnetic line of force - a line of force in a magnetic field. field line, line of force - an imaginary line in a field of force; direction of the line at any point in the direction of the force

Explanation:

Answer:

Two positively charged particles

Explanation:

I said two positively charged particles because if I say c or d what ever it is for you guy it can be wrong so just pick the one that says Two positively charged particles

Answer: C  Two positively charged particles.

Explanation:

just trust me on it, i've done the same quiz.

Answer:

B, It reacts with oxygen to form a new substance

Explanation:

B

Answer:

I think its

10 kg

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If the mass of an object is approximately 60 kg on earth then its mass remains the same on Mars which is 60 kg because mass does not change from place to place.

Mass in physics is a numerical representation of inertia, a fundamental property of all matter. What a body of matter is fundamentally is the resistance it offers to a change in its speed or location brought on by the application of a force. The more mass a body has, the less of a change a force exerts results. The kilogram is the unit of mass in the International System of Units, and it is defined by Planck's constant as being equal to 6.62607015 × 10⁻³⁴ joules second (SI).

According to the question, the weight of an object depends on gravity which is different from place to place so weight also varies from place to place but the mass is constant everywhere it does not change. So, if the mass of an object is 60 kg on earth then it remains the same on mars also.

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#SPJ5

Answer:

dxfgjcfygu.h

Explanation:

so sorrymcgvlg;uh'ijuoi'ogf;yulcfxkchgvjhgijuiu

y'i;fyltkxfgchghui

uy8't;fultdyk

Answer:

The entire electromagnetic spectrum, from the lowest to the highest frequency (longest to shortest wavelength), includes all radio waves (e.g., commercial radio and television, microwaves, radar), infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.