Please don't steal points. Physics A - Momentum Portfolio: the Seat Belt Design


PLEASE HELP! I'M FAILING THE CLASS! (PDF ATTACHED)

Answer:6km/sec

Explanation: Acceleration = Change in velocity / Time

Change in velocity = 60km/h minus 30km/hr

Time = 5seconds

Answer:when matter changes to from one state (solid, liquid, gas, plasma) to another

Explanation:

Answer:

75 volt

Explanation:

Current (I) = 5 A

Resistance (R) = 15 Ω

Voltage (V) = ?

We know

R = V/I

15 = v / 5

v = 75 Volt

According to the given statement , the acceleration of the sphere at the instant when its speed is 27.0 m/s.

We can use the principles of electrostatics and kinematics.  a = [(9.00 x 10⁹ N * m² / C²) * |5.00 μC * 2.00 μC| / (0.08 m)²] / (4.00 x 10⁻³ kg).

1. Determine the electric force between the two charges:
  - The electric force between two charges can be calculated using Coulomb's Law:

F = k * |q1 * q2| / r².
  - In this case, q1 = 5.00 μC and q2 = +2.00 μC. The distance between them, r, is the horizontal distance of 8.00 cm (which is 0.08 m).
  - The constant k is 9.00 x 10⁹ N * m^2 / C².
  - Plugging in the values, we get F = (9.00 x 10^9 N * m² / C²) * |5.00 μC * 2.00 μC| / (0.08 m)².

2. Calculate the net force acting on the sphere:
  - At any instant, the net force acting on the sphere is the sum of the electric force and the force due to gravity.
  - However, in this case, gravity can be neglected, as stated in the question.
  - Therefore, the net force acting on the sphere is equal to the electric force between the two charges.

3. Calculate the mass of the sphere:
  - The mass of the sphere is given as 4.00 x 10⁻³ kg.

4. Apply Newton's second law:
  - Newton's second law states that the net force acting on an object is equal to the product of its mass and acceleration: Fnet = m * a.
  - In this case, the net force acting on the sphere is the electric force between the charges.
  - Plugging in the values, we get (9.00 x 10⁹ N * m^2 / C²) * |5.00 μC * 2.00 μC| / (0.08 m)² = (4.00 x 10⁻³ kg) * a.

5. Solve for the acceleration:
  - Rearranging the equation, we have a = [(9.00 x 10⁹ N * m² / C²) * |5.00 μC * 2.00 μC| / (0.08 m)²] / (4.00 x 10⁻³ kg).
  - Evaluating the expression, we find the value of acceleration.

By following these steps, you can find the acceleration of the sphere at the instant when its speed is 27.0 m/s.

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Answer: coal

Explanation:  Nonrenewable energy resources include coal, natural gas, oil, and nuclear energy. Once these resources are used up, they cannot be replaced, which is a major problem for humanity as we are currently dependent on them to supply most of our energy needs

Answer:

A flat lens is a lens whose flat shape allows it to provide distortion-free imaging, potentially with arbitrarily-large apertures. The term is also used to refer to other lenses that provide a negative index of refraction. Flat lenses require a refractive index close to −1 over a broad angular range.

Explanation:

Plano - A plano lens is a flat lens. This is used when one side is flat and the other side is concave or convex. You can think of flat as a "plain."

this the answer

Answer:

67.5

Explanation:

The plane accelerates at 2.7m/s,^2

Time is 25 seconds

The velocity can be calculated as follows

= 25×2.7

= 67.5

Hence the speed f the plane is 67.5

Answer:

0.6 ☻︎☻︎☻︎☻︎☻︎☻︎☻︎☻︎☻︎☻︎☻︎

Harrison realized that the watch had the potential to be the timekeeping solution to the longitude problem with a few tweaks.

Realizing this led to the creation of H4, which has a diameter of just 13 centimeters. One of the upgrades Harrison made was a larger than usual balance wheel, which is a feature of most pocket watches. It had a greater frequency, pulsing five times per second, or 18,000 times each hour. The watch had a tiny remontoir and a revised version of Harrison's temperature compensation from H3.

The only issue, if you can even call it that, was that H4 needed oiling. However, Harrison used a creative approach to reducing friction by installing jeweled bearings at various points.

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When the north-pole end of a bar magnet is held near a stationary positively charged piece of plastic, it remains unaffected.

What is a bar magnet?

A bar magnet is made of ferromagnetic substance that produces

magnetic field.

What are the properties of a bar magnet?

Since plastic is not a ferromagnetic material or any other material like gold and silver ,they remain unaffected in the presence of magnetic field.

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Answer:

Visible light has much smaller wavelengths and can pass through the holes unobstructed. It isn't possible to see (resolve) objects and features smaller than the wavelength of light (electromagnetic radiation) used so this is why the mesh works.

Explanation:

(1) The time does pilot take the weight to hit the ground = 2.4 s

(2) The pilot travel before land = 400 m

Because fall time is proportional to fall height and acceleration due to gravity (g) is constant,

t₁ = t₂  

s₁ = initial distance

s₂ = final distance

t₁ = initial time

t₂ = final time

Hence, the time does it take the weight to hit the ground = 2.4 s

The initial distance (s₁) = 200 m, and the pilot does a run at the same height but twice the speed.

So, the  pilot travel before land:

s₂ = 2 x s₁

= 2 x 200 m

= 400 m

The question is incomplete, it should be:

There are competitions in which pilots fly small planes low over the ground and drop weights, trying to hit a target. A pilot flying low and slow drops a weight; it takes 2.4 s to hit the ground, during which it travels a horizontal distance of 200 m. Now the pilot does a run at the same height but twice the speed. How much time does it take the weight to hit the ground? How far does it travel before it lands?

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Change in potential energy  is calculated as 66267.6 J

v₂, speed of the cart at B  is calculated to be 24 m/s

Quantitative property that is transferred to a body or to a physical system and is recognizable in the performance of work and in the form of heat and light is called a as energy.

As we know, KE1 + PE1 = KE2 + PE2  

Given m=230kg,h=39.1 m, h2= 9.7m  

we know g= 9.8m/s^2

As we know, KE1 + PE1 = KE2 + PE2  

0 + m*g*h₁ = .5(m)v₂² + m*g*h₂

(230)*(9.8)*(39.1)= 0.5(230)(v₂² )+ (230)(9.8)(9.7)

88131.4 = 115 v₂² + 21863.8

66267.6 = 115 v₂²

v₂²  = 576.24

v₂ = 24 m/s

We know, change in potential energy is PE2 - PE1

88131.4- 21863.8

Change in potential energy = 66267.6 J

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We will have the following:

From the graph we can see that the point at which it is accelerating upward is at point C. [We can see that where the slope of the function is positive the acceleration will be positive]

We determine the maximum magnitude of the acceleration of the rider by using the maximum force, that is:

So, the maixmum magnitude of the acceleration will depend on the mass of the rider. Now, since the mass cannot be 0 kg since that would undetermine the expression we know then that the best approximation is:

Where "m" is the mass of the rider in kg. Since we are not given a mass, then the acceleration can only be expressed as the force divided by the mass of the rider.

Answer:

W = 76 N

Explanation:

In this exercise you are asked to find the weight of the body.

Mass is a quantity that is invariant, it measures the same everywhere, the weight depends on where it is measured, a simple way to find the weight of a body is

          W = g m

where g is the constant of the place, in this case we have the weight of the body on Mars and its mass which is constant on Earth and on Mars

            W = 3.8 20

            W = 76 N

Answer:

Number of Significant Figures: 3

The Significant Figures are 2 3 5

Explanation:

The elastic potential energy will be =

For a)  7.5J

For d)  1687.5J

For g)  0.675J

For b) 11.718J

For e) 1267.5J

For h) 1080J

For c)  73507.5J

For f)  10.8J

For i)  18750J

According to the formula for calculating elastic potential energy,

Elastic potential energy (u) = 1/2 x spring constant x \((amount of extension)^{2}\)

Let was calculate the value of 1/2 x spring constant to simplify the equation = 1/2 x 15 = 7.5

for a) 7.5 x \(1^{2}\) = 7.5J

for d) 7.5 x \(15^{2}\) = 1687.5J

for g) 7.5 x \(0.3^{2}\) = 0.675J

for b) 7.5 x \(1.25^{2}\) = 11.718J

for e) 7.5 x \(13^{2}\) = 1267.5J

for h) 7.5 x \(12^{2}\) = 1080J

for c) 7.5 x \(99^{2}\) = 73507.5J

for f) 7.5 x \(1.2^{2}\) = 10.8J

for i) 7.5 x \(50^{2}\) = 18750J

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The graph that corresponds to 0.1 s in one complete cycle is graph D.

option D is the correct answer.

The period of a wave is the time for a particle on a medium to make one complete vibrational cycle. Period, being a time, is measured in units of time such as seconds, hours, days or years.

Also, the period of a wave is the amount of time it takes for a wave to complete one wave cycle or wavelength.

From the given parameter, the coil rotates 10 times in one second. The period of the coil is calculated as;

Period = 1 s / 10

Period = 0.1 s

From the graphs, the only option that has one complete cycle in one second is option D.

Check option D, half cycle is 0.05 s and one full cycle is 0.1 s.

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Answer:

Has the same properties as it's parts

Explanation:

Given data

*The given storm cloud has a charge is q = +0.35 C

*The tree gains a charge is Q = -0.02 C

*The distance between them is r = 150 m

*The value of the Coulomb's constant is k = 9 × 10^9 N.m^2/C^2

The formula for the amount of force between the cloud and the tree is given as

Substitute the known values in the above expression as

Here the negative sign indicates that the charges are attractive in nature.

Hence, the amount of force between the cloud and the tree is F = -2.8 × 10^3 N

Answer: no it shouldn't be

Explanation:

Answer:

i have absolutly no idea how to do it but i looked it up and your answer should be B. i could be wrong but thats what the web told me

Relation between Distance and acceleration

\(\\ \tt\longmapsto a=dv/dt\)

\(\\ \tt\longmapsto a=ds/dt^2\)

So

\(\\ \tt\longmapsto a\propto s\)

And

According to Newton's law

\(\\ \tt\longmapsto F=ma\)

\(\\ \tt\longmapsto F\propto m,a\)

Answer: D!

Explanation: I think I learned this in school a few years ago, and in SMART, each letter stands for something, but I don't remember what. But anyways, I'm pretty sure the answer is D. Hope this helps! :)

You can change the wavelength into scientific notation and the electromagnetic spectrum will then tell you where it falls.

In physics, the wavelength is the spatial period of a periodic wave—the space over which the wave's shape repeats. It's miles the distance among consecutive corresponding points of the same section on the wave, together with two adjacent crests, troughs, or zero crossings, and is a function of each traveling wave and status wave, in addition to other spatial wave styles.

The inverse of the wavelength is referred to as the spatial frequency. Wavelength is normally designated through the Greek letter lambda (λ). The time period wavelength is also every now and then implemented to modulated waves, and to the sinusoidal envelopes of modulated waves or waves formed via interference of numerous sinusoids.

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Answer:

See explanation

Explanation:

A change in momentum occurs when a force is applied to an object and changes its velocity.

Answer:

Inorganic.

Explanation:

The chemical change which describes the reactions of elements and compounds that, in general, do not involve carbon and typically take place in laboratories or industries is inorganic.

In Chemistry, an inorganic chemical reaction can be defined as a type of chemical reaction that occurs without a carbon-hydrogen bond.

On the other hand, organic chemistry deals with reaction that occur in the presence of carbon-hydrogen bonds such as hydrocarbons.

According to the given statement 70.4 m/s²  is the acceleration due to gravity on that planet.

Acceleration is the rate of increase in a moving object's speed and direction over time. When something travels faster or slower, it is considered to be accelerating. Motion on a circle increases even while the speed remains constant because the direction is always shifting.

W = 741 N is the weight of a person on Earth.

The formula below provides a person's weight as:

W = mg

The acceleration brought on by gravity is known as g.

m = W/m

m = 741/9.8

m =  75.61 kg

W' = 5320 N, where W' represents the weight of a person on the surface of a nearby planet.

The acceleration brought on by gravity on that planet is g'. So,

g' = W'/m

g' = 5320/75.61

g' = 70.4m/s²

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The presence of the nearby north pole rearranges the magnetic domains inside the nail so that their south poles all point toward the north pole of the permanent magnet.

This is referred to as a material that can produce its own magnetic field and consists of two poles which are north and south pole.

In a scenario whereby a nail is rubbed a few times by the magnet, the magnetic domains inside the nail rearranges such that the south poles all point toward the north pole of the permanent magnet and the other end of the nail becomes a north pole.

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Answer:

0.25m/s

Explanation:

m1v1 =m2 v2. law of conservation the of momentum. since they smash together to form a big drop M2 =2m1

m1*0.50m/s=2m1*v2

V2= m1*0.50m/s÷2m1

V2= 0.25m/s