What would the acceleration be for a car at a stop light that
speeds up in the North direction to 20 m's in 10 s?
HELP PLA

Answer:

ΔU = 5.21 × 10^(10) J

Explanation:

We are given;

Mass of object; m = 1040 kg

To solve this, we will use the formula for potential energy which is;

U = -GMm/r

But we are told we want to move the object from the Earth's surface to an altitude four times the Earth's radius.

Thus;

ΔU = -GMm((1/r_f) - (1/r_i))

Where;

M is mass of earth = 5.98 × 10^(24) kg

r_f is final radius

r_i is initial radius

G is gravitational constant = 6.67 × 10^(-11) N.m²/kg²

Since, it's moving to altitude four times the Earth's radius, it means that;

r_i = R_e

r_f = R_e + 4R_e = 5R_e

Where R_e is radius of earth = 6371 × 10³ m

Thus;

ΔU = -6.67 × 10^(-11) × 5.98 × 10^(24)

× 1040((1/(5 × 6371 × 10³)) - (1/(6371 × 10³))

ΔU = 5.21 × 10^(10) J

Answer:

Newton's first law of motion states that an object at rest will remain at rest and an object in motion will remain in motion unless it is acted on by an unbalanced force. Using unbalanced forces to control the motion of a skateboard demonstrates Newton's first law of motion.

Hope it helps

Answer:

Good question! It's the law of motion.

Explanation:

Answer:

a person appears at a specified time and place and gives sworn testimony

Explanation:

Hope this helps

Answer:

it is B. The Law of Conservation of Energy

Explanation:

hope this helps

d is the right answer

Answer:

OC, The Tariff of Abominations caused conflicts between the North and the South regarding their sectional interests.

Explanation:

The Tariff of Abominations did cause conflicts because it widened income inequality since it favored the rich upper class while burdening the lower class. The South was the lower class, and the North was more of the upper class.

Answer:

When white light passes through the prism ,different colours suffers deviation through different angles and light appears to be dispersed. But in a hollow prism dispersion does not take place as all the colours travel with same speed in the air inside hollow prism. Thus no angular dispersion is there.

Answer : Convection is a major factor in weather. The sun heats the earth's surface, then, when cooler air comes into contact with it, the air warms and rises, creating an upward current in the atmosphere. That current can result in wind, clouds, or other weather.

Explanation:

In the atmosphere convection happens when warm air on the ground rises into the atmosphere(clouds) and at the high altitudes the air becomes cold  causing the air to come back down to the surface.

Answer:

The answer is 20J

Explanation:

Answer:

C. Test to see if your material is strong and works well.

Answer:

V = 440I

Explanation:

According to ohm's law which states that the current passing through a metallic conductor at constant temperature is directly proportional to the potential difference across its ends.

Let V be the potential difference

I is the current

R is the resistance

Mathematically;

V∝I

V = IR

Given

Potential difference V = 5.50Volts

Current = 12.5mA = 12.5*10^-3A

Current  I = 0.0125A

Recall that V = IR

R = V/I

Substitute the given parameters into the formula;

R = 5.50/0.0125

R = 440 ohms

Hence the equation that links current, potential difference and resistance is expressed as;

V = I(440)

V = 440I

Given that,

Mass of the stone, m = 400 g = 0.4 kg

Initial speed, u = 20 m/s

It is climbed to a height of 12 m.

To find,

The work done by the resistance force.

Solution,

Let v is the final speed. It can be calculated by using the conservation of energy.

[tex]v=\sqrt{2gh} \\\\v=\sqrt{2\times 9.8\times 12} \\\\v=15.33\ m/s[/tex]

Work done is equal to the change in kinetic energy. It can be given as follows :

[tex]W=\dfrac{1}{2}m(v^2-u^2)\\\\=\dfrac{1}{2}\times 0.4\times (15.33^2-20^2)\\\\=-32.99\ J[/tex]

So, the required work done is 32.99 J.

Answer:

Explanation:

there could be earthquakes or the tectonic plates under can make it fall apart,  natural disasters

hope this helps!!

Answer:

(i) The speed of the whistle is 16.[tex]\overline 3[/tex] m/s

(ii) The lowest note heard by the person is 3,818.[tex]\overline{18}[/tex] Hz

(iii) The time taken for the whistle to make one revolution is approximately 0.38468 seconds

(iv) The time interval between the person hearing the highest and lowest note is approximately 0.19234 seconds

Explanation:

The question relates to the Doppler effect for which the change in frequency is given as follows;

[tex]f_L = \left ( \dfrac{v \pm v_L }{v \pm v_S} \right ) \cdot f_S[/tex]

Where;

[tex]f_L[/tex] = The frequency heard by the listener

v = The speed of sound in air = 343 m/s

[tex]v_L[/tex] = The listener's speed

[tex]v_S[/tex] = The source's (whistle) speed

[tex]f_S[/tex] = The frequency of the source

The given parameters are;

The frequency of the whistle (source), [tex]f_S[/tex] = 4 kHz = 4,000 Hz

The radius of the horizontal circle around which the whistle is whirled = 1 m

The highest note heard by a person a large distance away = 4200 Hz

The distant listener is taken as stationary, [tex]v_L[/tex] = 0 m/s

We therefore have;

[tex]f_L = \left ( \dfrac{v \pm 0 }{v \pm v_S} \right ) \cdot f_S = \left ( \dfrac{v }{v \pm v_S} \right ) \cdot f_S[/tex]

(i) When the whistle's motion while it is being whirled towards the listener, [tex]v_S[/tex] is negative

When the whistle's motion while it is being whirled is away from listener, [tex]v_S[/tex] is positive

The highest note, [tex]f_{LH}[/tex], is obtained with the lowest denominator, that is when the source moves towards the listener and [tex]v_S[/tex] is negative, we get;

[tex]f_{LH} = 4,200 \ Hz = \left ( \dfrac{343 \ m/s }{343 \ m/s - v_S} \right ) \times 4,000 \ Hz[/tex]

[tex]\dfrac{4,200 \ Hz}{4,000 \ Hz} = \dfrac{21}{20} = \dfrac{343 \ m/s}{343 \ m/s - v_S}[/tex]

21·(343 m/s - [tex]v_S[/tex]) = 20×343 m/s

21 × [tex]v_S[/tex] = 21 × 343 m/s - 20 × 343 m/s = 343 m/s

[tex]v_S[/tex] = (343 m/s)/21 = 49/3 m/s = 16.[tex]\overline 3[/tex] m/s

The speed of the source = The speed of the whistle

∴ The speed of the source = [tex]v_S[/tex] = 16.[tex]\overline 3[/tex] m/s = The speed of the whistle

(ii) The lowest note heard by the person occurs when the denominator of the formula for the change in frequency is smallest for which we have the value of [tex]v_S[/tex] as positive and the source moves away from the observer which is presented as follows;

[tex]f_{LH} = \left ( \dfrac{343 \ m/s }{343 \ m/s +16.\overline 3 \ m/s } \right ) \times 4,000 \ Hz = 3,818.\overline {18} \ Hz[/tex]

The lowest note heard by the person = 3,818.[tex]\overline{18}[/tex] Hz

(iii) The angular velocity of the whistle, ω is given as follows;

[tex]\omega = \dfrac{\theta}{t} = \dfrac{v_S}{r} = \dfrac{16. \overline 3 \ m/s}{1 \ m} = 16. \overline 3 \ radians/second[/tex]

The angle rotated in one revolution, is 2·π radians, therefore, when θ = 2·π radians, the time, [tex]t_c[/tex], to complete one revolution is given as follows;

[tex]t_c = \dfrac{\theta}{\omega} = \dfrac{2 \times \pi \ radians}{16. \overline 3 \ radians/second} \approx 0.385 \ seconds[/tex]

Therefore, the time to complete one revolution ≈ 0.38468 seconds

(iv) The time interval between the person hearing the highest and lowest note is the time to complete half a cycle ≈ 0.38468/2 seconds ≈ 0.19234 seconds.

Answer:

e4atetetsgts4tgesetse

Explanation:

ger54ttagcuit B, then the voltage in circuit A is less than the voltage in circuit B. Item 4 If the voltage of circuit A is equal to the voltage of circuit B, then the current in circuit A is less than the current in circuit B. If the current in circuit A is equal to the current in circuit B, then the voltage in circuit A is less than the voltage in circuit B. If the voltage of circuit A is equal to the voltage of circuit B, then the current in circuit A is equal to the current in circuit B. 0 Type here to search е c​

Answer:

carbon-14 must be the answer

Answer:

A. identify plants and make assumptions on past climate conditions.

Explanation:

Answer was right on my Edge quiz!

Pollen grains help scientists identify plants and make assumptions on past climate conditions.

Proxy climate is climate inferred from past records i.e. not current.

Proxy climate makes use of proxy climate data also called proxies. These proxies help in inferring about the past climate.

Examples of proxies are;

Therefore, pollen grains help scientists identify plants and make assumptions on past climate condition.

Learn more about past climate at: https://brainly.com/question/9328022

Answer:

10

Explanation:

Givens

vi = 20 m/s

vf = 60 m/s

t = 4 second.

Formula

a = (vf - vi) / t

a = (60 - 20)/4

a = 40 / 4

a = 10 m/s^2

Answer:

Explanation:

To get the person Moving you have to overcome the static (means not moving) friction coefficient.  U(static)

To get the person going at the same speed you have to overcome the kinetic friction coefficient. U(Kinetic)

Force to get him moving is 198 N.   Force = ma = U(static)Mg

combining the 2 equations you get 198N = U(static)* 55kg *9.8m/s^2   Solve for U(static)

Same equation to keep him moving except with the dynamic force and the dynamic U

175N=  U(kinetic)*55kg*9.8m/s^2  Solve (U dynamic)

Newton's second law and the expression of the friction force allow to find the result for the value of the kinetic friction coefficient is:

          μ = 0.325  

Newton's second law establishes a relationship between the net force, mass, and acceleration of the body.

         Σ F = m a

Where the bold letters indicate vectors, m is the mass and the acceleration.

The friction force is a macroscopic force that represents the interactions between the two surfaces, it can be of two types:

The expression in both cases is:

         fr = μ N

Where N is the normal and μ is the friction coefficient, one value for the static case and another for the kinetic case.

In the attachment we have a free-body diagram for when the skater is moving with constant speed.

y=axis

            N - W = 0

            N = W

x-axis

           F - fr = 0

           F = fr

They indicate that the applied force is F = 175N and the mass of the skater is m = 55 kg.

We substitute.

            F = μ mg

            μ = [tex]\frac{F}{mg}[/tex]  

Let's calculate.

          μ =[tex]\frac{175}{55 \ 9.8}[/tex] 175/55 9.8

          μ = 0.32

In conclusion, using Newton's second law and the expression of the friction force we can find the result for the value of the coefficient of kinetic friction is:

          μ = 0.325

Learn more here:   brainly.com/question/1714663

Answer:

This is Newton's first law.

Explanation:

An object in motion will stay in motion and an object at rest wI'll stay at rest unless acted upon by an unbalanced force.

Answer:

in the ball

Explanation:

potential energy is where an object has energy, always, but it isn't always moving, and when you drop the ball, it has kinetic energy.

Maps can convey a lot of different types of information. They can tell you where you are or they can tell you something about a location. Earth scientists often use maps that have coordinates so that they can locate themselves or the features they are interested in. Different types of maps show different things well. For example, some types of maps show the tropical areas really well but do a terrible job depicting the polar regions.

Answer:

it is absorbed or reflected by the atmosphere

Explanation:

In the case when approx 50% only of the solar energy would be directed towards earth and it would be penetrates directly to the surface so the rest or remaining of the radiation would be either absorbed or refected by the atmosphere

So as per the given situation the above represent the answer

hence, the same is to be considered and relevant

Answer:

His inertia increases.

Explanation:

Inertia is defined as the force which keeps stationary objects to stay still (remain at rest) or moving objects in motion at the same speed and in the same direction unless it is stopped by an external force. It can also be defined as the resistance of an object to resist change by remaining in its state of rest or in motion. Therefore, his inertia increases.

Answer:

downward by the book

Explanation:

because of gravity

Answer:

Vector

Explanat

Vector is the only right answer in the situatuin