A roller-coaster goes over a 12 m tall hill then approaches a 30 m hill. What is the minimum velocity the roller-coaster would need when going over the 12 m hill to make it to the top of the 30 m hill?

254.8 m/s

15.96 m/s

Not enough information to answer

18.78 m/s

Answer:

The compound formed has ionic bonds and is a crystalline solid

Explanation:

A metal plus a nonmetal chemical combine to form an ionic compound, with ionic bonds

The spin of the odd particle, which can be inferred by counting energy levels up to the Fermi level, determines the ground-state spin of the nucleus.

A positive-charged subatomic particle is known as a proton. Protons are held together in the atom's nucleus by the strong nuclear force. The neutron is a type of subatomic particle without charge.

subatomic particles with a positive charge that live in the nucleus. Neutrons: Subatomic particles with a neutral charge that are found in the nucleus. Electrons: Subatomic particles with a negative charge that are present in the electron shells that enclose the nucleus.

The positive charge proton have a propensity to reject one another, but the neutrons keep the nucleus together. The quantity of protons determines the atomic number, and the sum of the protons and neutrons determines the atomic mass. The atomic mass of hydrogen is 1, as there is just one proton and no neutrons in the material.

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The time taken for the stone to reach the ground when it is thrown above the ground is 0.57 s.

Given that,

Velocity of the stone = 6.38 m/s

Height above the ground = 1.63 m

The time t at which the stone's vertical position y(t) becomes zero is the amount of time it takes for it to fall to the earth.

It is given by the formula, y(t) = 1.63 - 1/2* 9.81* t² = 0

1.63 - 4.9 t² = 0

4.9 t² = 1.63

t² = 1.63/4.9 = 0.33

t = 0.57 s

Thus, the time taken by the stone to reach the ground is 0.57 s.

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The car that will be more prone to corrosion is the aluminium car (Car1)

Corrosion is when a refined metal is naturally converted to a more stable form such as its oxide, hydroxide or sulphide state this leads to deterioration of the material.

Most metals are easily oxidized I.e they tend to lose electrons to oxygen or other substances in the air or in water. As oxygen is reduced (gains electrons), it forms an oxide with the metal.

Both aluminium and steel do not rust but steel has better edge to aluminium in resistance to corrosion because steel has chromium which gives it a protective film and excellent corrosion resistance. Moreover steel is non porous substance.

Therefore the aluminum car will be more prone to corrosion.

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Ice on steel has low coefficient of friction whereas rubber on pavement has high coefficient of friction. Object such as silicone rubber can have a coefficient of friction much greater than one.

Polytetrafluoroethylene has the lowest friction coefficient of any solid-state material but the coefficient of friction depends on the materials used.

Ice on steel has a low coefficient of friction as the two materials slide past each other very easily whereas rubber on pavement has a high coefficient of friction that is the materials do not slide past each other easily. We can say that rougher surfaces have a higher coefficient of friction.

Coefficient of friction more than one means that the frictional force is stronger than the normal force. An object such as silicone rubber, for example, can have a coefficient of friction much greater than one.

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Answer:

Q = (80 - 20) deg C * 1.3 kg * 4184 J / (deg C kg) = 326,000 Joules

Answer:

80

Explanation:

You calculate work by W(j)=Force(n) x distance moved (m)

So 20.0 N x 4.0 m = 80.

:)

The work done when a baker pushes a cart full of rolls with a force of 20.0 N for a distance of 4.0 m is 80 Nm.

The work done by a force can be defined as the product of the displacement of that object and the component of the applied force of the object which is in the same direction as that of displacement. When we push a block with some force 'f' and the body moves with some acceleration, work is done.

W = f × d

where, W = work done,

f = applied force,

d = displacement of the object

W = 20N × 4.0m

W = 80Nm

Therefore, the work done by the baker on that cart is 80 Newton meters.

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Force required to hold ball completely submerged under water is calculated as 0.257 N.

Net upward force on any object in any fluid is called buoyant force . If buoyant force is greater than the object's weight, then the object will rise to the surface and float.

Given, ρ1 = 0.0835 g/cm3  and ρ2 =1g/cm3)

and radius = 3.81/2 cm = 1.9 cm

As, the volume of sphere = 4/3 π r3

and mass of sphere = 4/3 π r3 ρ1

So, weight of the sphere is 4/3 π r3 ρ1 g

Volume of water displaced = 4/3 π r3

As we know, buoyant force = 4/3 π r3 ρ2 g

= 4/3 π  * 1.9 * (1-0.0835) *9.81

= 257.66 * 10^-3

F = 0.257 N

Force required to hold it completely submerged under water is 0.257 N

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The acceleration of the airplane of mass 5000 kg is 0.1 m/s².

Acceleration is the rate of change of velocity.

To calculate the acceleration of the airplane, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the acceleration is 0.1 m/s².

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The two measurements, which are needed in order to calculate the speed of an object in motion, be: amount of distance travelled at a particular time interval and the time interval.

The pace at which an object's position changes in any direction is what is meant by speed.

Speed is measured as the ratio of the distance traveled to the time it took to cover that distance. Speed is a scalar quantity since it just has a direction and no magnitude. Be meter/second is the SI unit of speed.

The equation, s = d/t, offers the speed formula.

Where,

s is the speed in m.s⁻¹

d is a representation of the distance in m.

The duration in s is t.

your question is incomplete, but most probably your full question was

Which two measurements are needed in order to calculate the speed of an object in motion?

Distance and time

Time and mass

Force and distance

Volume and time

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When the boy realizes he is late for dinner, he doubles his acceleration. The force that the boy is pulling the wagon now will also be doubled.

What is Newton's first law?

Unless influenced by an imbalanced force, an item at rest stays at rest, and an object in motion keeps moving in a straight path at a constant pace.

An item that is stationary is one that is not shifting or considered the beginning.  In such posture, all the forces exerting pressure on it are balanced out or their combined magnitudes are zero.

Based to their inertia, stationary objects which have already balanced forces acting on them prefer to stay that way. When an unbalanced force is operating on a stationary item will it move.

As we continuously  increases the force some particular object the acceleration also increases proportionally. so, the mass does not change as the acceleration increases, we can say that force that the boy is pulling the wagon is equal to acceleration. Therefore, if the boy double the force double the acceleration.

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The minimum force to start the block moving is 40N

Limiting friction occurs when the moving force and the force opposing motion are equal,any addition to the moving force will cause slipping. The limiting frictional force is proportional to the normal reaction between the contacting surfaces and is independent of the area of contact.

Therefore for an object to be stationary, the moving force is equal to force opposing it. In these scenario the minimum force to move a stationary object must be equal to the weight of the object. The weight of the object is 40N.

Therefore the minimum force to move the block is 40N.

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Star formation occurs in the halo rather than the disk because there is more visible material in the halo this statement is false. The galaxy's disk, which is mostly made of gas, is where stars are formed.

Formation of stars. Molecular clouds, which are relatively dense collections of interstellar gas and dust, are where stars are born. These areas are quite chilly (temperature about 10 to 20K, just above absolute zero). Gases become molecular at these temperatures, which means that atoms are bound together. As a result of the disk's abundance of gas and dust, vigorous star formation occurs there. The spiral arms of the galaxy are where stars develop.

All the gas and the young stars are in the disk, but there are also some ancient stars. An aggressive core and elderly stars dominate the bulge. Globular clusters and extremely ancient stars can be found in the halo. An indication of how the Galaxy formed can be found in the cause of this division of star kinds.

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Answer:

Below

Explanation:

Normal force = mg = 17(9.81)

force of friction = normal force * coefficient of static friction

                           = (17* 9.81 * .5) = 83.4 N

Answer:9700 N

Explanation: i js know

Answer:D

Explanation:

Graph of weight vs. forces of friction of the shoes would be linear. Greater is the weight (X) of shoes, greater is friction (Y) between the object and the surface on which the object is kept.

Given let weight being X and forces of friction being Y.

As we know that the gravitational force is equal to mass multiplied by acceleration due to gravity. When mass increases, weight of the shoes (X) increases, therefore normal force increases and so friction  (Y) also increases.

Friction is directly dependent on the weight acting between two surfaces. When the mass is more, weight will be more and hence friction will also be more.

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 3,958 miles miles would you have to dig

The mile, sometimes the best of international mile or statute mile to distinguish it from the  other miles, is a British imperial unit and United States customary to know unit of to the relative distance; both are based on to the older English unit of to the length equal to 5,280 English-english feet, or 1,760 yards.

Well, it depends what you mean by “bottom.” Earth is the  ball, so if you wanted to dig in to  the center of it, it's 3,958 miles. But if you wanted to dig all the way throughs and pop out the other side, it's twice as far, or 7,916 miles.

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Answer:

Approximately [tex]2.3\; {\rm m\cdot s^{-1}}[/tex] to the left.

Explanation:

When an object of mass [tex]m[/tex] travels at a velocity of [tex]v[/tex], the momentum [tex]p[/tex] of that object will be [tex]p = m\, v[/tex].

Denote motions to the right with a positive sign.

Before the collision:

After the collision:

Immediately after the collision, momentum [tex]p[/tex] of the canoe and the raft will be conserved. In other words:

[tex]\begin{aligned}& p(\text{canoe, before}) + p(\text{raft, before}) \\ =\; & p(\text{canoe, after}) + p(\text{raft, after})\end{aligned}[/tex].

Rearrange to find [tex]p(\text{raft, after})[/tex] (momentum of the raft immediately after the collision.)

[tex]\begin{aligned}& p(\text{raft, after}) \\ =\; & p(\text{canoe, before}) \\ & + p(\text{raft, before}) \\ & - p(\text{canoe, after}) \\ =\; & (-160\; {\rm kg \cdot m\cdot s^{-1}}) \\ &+ (133\; {\rm kg \cdot m\cdot s^{-1}}) \\ & - (16.0\; {\rm kg \cdot m\cdot s^{-1}}) \\ =\; & (-43)\; {\rm kg \cdot m\cdot s^{-1}} \end{aligned}[/tex].

(Momentum of the raft is negative since the raft is moving to the left, away from the positive direction.)

Divide the momentum of the raft by the mass of the raft to find the velocity of the raft:

[tex]\begin{aligned} \frac{(-43\; {\rm kg\cdot m\cdot s^{-1}})}{(19.0\; {\rm kg})} \approx (-2.3)\; {\rm m\cdot s^{-1}}\end{aligned}[/tex].

Answer:

10

Explanation:

as f=ma

if you make a the subject it becomes f/m=a so when the denominate increases the answer increases

Ratio of turns on the primary coil is 26

Briefing

So to solve for this problem this is computed by the following steps

Vp/Vs  (=Np/Ns)

Briefing

Where;

Vp = Voltage primary

Vs = Voltage Secondary

Np =Turn ratio primary

Ns = Turn  ratio Secondary

So plugging in our Valves

110/4.1 =Np/Ns

Np/Ns= 26.82

So the answer is 26  Coils

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If we are not able to produce energy anymore, civilization would come to a stand still.

We know that the term energy has to do with the ability to do work. Thus we know that a lot of the processes that occur on the earth does require energy so that it would be able to occur.

Energy has become the pivot of modern civilization. Without the ability to produce energy, we can not be able to have a comfortable life and life on the earth would be found to become quite unbearable.

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46 days is the half-life of the radioisotope.

The half-life, in radioactivity, is the amount of time needed for half of the atomic nuclei in a radioactive sample to spontaneously transform into other nuclear species while emitting particles and energy, or, alternatively, the amount of time needed for the radioactive sample to disintegrate on average once every second.

The half life of a radioactive substance can be predicted by:

N(t) = N₀(1/2)^[t/t(h)]

N(t)  is the amount remaining (mg)

N₀ is the initial amount (mg)

t is the time elapsed, in days

t(h) is the half life in days.

N(t) = N₀(1/2)^[t/t(h)]

or, 0.50mg = (8.0mg)(1/2)^[184 days/t(h)]

Using logs, we can solve this for t(h):

t(h) = 46 days

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The motorbike travels at a speed of 40 m/s

the speed at which an object's location changes in any direction. The distance traveled divided by the time it took to travel that distance indicates how fast something is moving.

Kinetic energy, which may be seen in the movement of an item or subatomic particle, is the energy of motion. Kinetic energy is present in every particle and moving object.

KE = ½ m[tex]V^{2}[/tex]

We have kinetic energy of 200,000 j, mass of 250 kg , so to fine [tex]v^{2}[/tex]

using KE = ½ m[tex]V^{2}[/tex]

kinetic energy will be multiply by 2 and divided by mass

[tex]v^{2}[/tex]= KE / 1/2 * m

[tex]v^{2}[/tex] = 200000 * 2 / 250

[tex]v^{2}[/tex] = 1600

v = [tex]\sqrt{1600}[/tex]

v = 40 m/s

The motorbike travels at a speed of 40 m/s

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The process of selecting the optimal action to take from a multitude of possibilities can be characterized as decision making.

Meaning of making decisions:

The basic goal of managerial economics is decision-making. The process of choosing the best course of action from among multiple alternatives can be referred to as decision-making. Whenever there are numerous options, decision-making becomes a challenge.

Decision Making and Economics

Well, making decisions affects everyone's life; they are not just for executives or the corporate sector. Whether a person is employed or jobless, making decisions is important to everyone. Regardless of the work you are now doing, a choice needs to be made. You have several choices to make as a participant.

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The amount of light that passes through the three Polaroid filters in order is 12.5%.

Light is an adjective that describes something that isn't weighty, cumbersome, or depressing. A conversation topic or a music piece are both examples of things that can be considered light. The weight is light even though the trip is long, for instance.

Angle of transmission axis; θ = 45°

Formula for intensity of light from first polarizer is;

I₁ = ¹/₂I₀

Formula for intensity of light from second polarizer is;

I₂ = I₁cos²θ

Formula for intensity of light from third polarizer is;

I₃ = I₂cos²(90 - θ)

Combining the 3 equations;

Put ¹/₂I₀ for I₁ in second formula to get;

I₂ = ¹/₂I₀cos²θ

Put ¹/₂I₀cos²θ for I₂ in third formula to get;

I₃ = ¹/₂I₀cos²θ*cos²(90 - θ)

Plugging in 45° for θ gives;

I₃ = ¹/₂I₀cos²45*cos²(90 - 45)

⇒ I₃ = ¹/₂I₀cos²45*cos²45

⇒ I₃ = ¹/₂I₀cos⁴45

Now, cos 45 in surd form is 1/√2. Thus;

I₃ = ¹/₂I₀(1/√2)⁴

I₃ = ¹/₂I₀(¹/₄)

I₃ = ¹/₈I₀

I₃/I₀ = ¹/₈

I₃/I₀ = 0.125

In percentage form, we have;

I₃/I₀ = 12.5%

Light is a universally recognized metaphor for knowledge and rational reasoning; it is the antithesis of darkness or ignorance. The dark is almost usually thought to be ominous and dangerous, connected with things that cannot understand. According to legend, light dispels darkness and creates order from chaos.

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Answer: 1.25 A

Explanation:

I = R/V  (Ohm's Law)

I = 150 Ω / 120 V = 1.25 A

Answer:

2m/s square

Explanation: