PLEASE HELP ME ANSWER THE PHYSICS QUESTIONS ON MY PROFILE!!! i will give brainliest to the first to answer!!! this one and the other ones LAST QUESTION!!!!!!!!!!!!! GET A BRAINLIEST



How far does a plane fly in 18 s while its velocity is changing from 146 m/s to 78 m/s at a uniform rate of acceleration?

The required quarts that is equals to 5 pounds of ethanol would be 3 quarts if the density of ethanol is 0.789 g/mL.

Density is the ratio of mass and volume.

density = mass/volume

The density of ethanol is 0.789 g/mL.

Convert pounds to grams

∵ 1 pounds = 453.592 grams

∴ 5 pounds = 2267.96 grams

So the mass of ethanol would be 2267.96 grams

Density Equation

density = mass/volume

Solve for volume.

volume = mass / density

volume = 2267.96 g / (0.789 g/mL)

volume = 2267.96 g / (0.789 g/mL)

volume = 2874.47 mL

Convert milliliters to quarts.

∵ 1 mL = 0.00105669 quarts

⇒ 2874.47 mL × 0.00105669 qt /1 mL

⇒ 3 quarts

Hence, the volume of ethanol would be 3 quarts.

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A rope pulls a Tesla out of mud. The guy pulls a force F⊥ of 300N, and theta = 4.2°. The tension force T is 298.44__ Newton.

The problem describes a Tesla that is stuck in the mud and needs to be pulled out using a rope. the guy pulls a force F⊥ of 300N and that the angle between the rope and the horizontal plane is θ = 4.2°. The goal is to find the tension force T exerted by the rope.To solve for T, we'll need to use trigonometry. We can break the force vector into its horizontal and vertical components as follows:

Fx = F⊥ cosθ and Fy = F⊥ sinθ.

Since the rope is pulling the Tesla horizontally, the horizontal component of the force will be the tension force T. So we have:

T = Fx = F⊥ cosθ = (300 N) cos(4.2°) ≈ 298.44 N

Taking the cosine of the angle is necessary since it's the adjacent side that we're interested in, which is the horizontal component of the force. Therefore, the tension force exerted by the rope is approximately 298.44 N.

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The answer is "Infrared"

Hope this helps

Answer:

x-rays

Explanation:

The independent variable in this experiment is the act of turning the bulb on and off, while the dependent variable is the behavior of the earthworm in response to changes in light. The scientist can analyze the data collected to determine the impact of light on the earthworm's behavior.

In the experiment where a scientist is turning a bulb on and off to check the behavior of an earthworm, the independent variable is the manipulation performed by the scientist, which is the act of turning the bulb on and off.

The independent variable is the variable that the scientist deliberately changes or controls in order to observe its effect on the dependent variable. In this case, the scientist is interested in investigating how the earthworm responds to changes in light. By turning the bulb on and off, the scientist is manipulating the presence or absence of light in the environment of the earthworm.

The behavior of the earthworm, which is the dependent variable, will be observed and measured in response to the changes in light. The scientist may record various behaviors such as movement, burrowing, or changes in activity level exhibited by the earthworm when the light is turned on and off.

By systematically controlling the independent variable (turning the bulb on and off) and observing the dependent variable (behavior of the earthworm), the scientist can analyze the relationship between light exposure and the earthworm's behavior. This allows for drawing conclusions about how the earthworm responds to light stimuli.

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Answer:

516526.863 m

Explanation:

From the question given above, the following data were obtained:

Acceleration due to gravity (g) = 2.24 m/s²

Mass (M) = 8.96×10²¹ Kg

Gravitational constant (G) = 6.67×10¯¹¹Nm²/Kg²

Radius (r) =?

The radius of the planet can be obtained as follow:

g = GM/r²

2.24 = 6.67×10¯¹¹ × 8.96×10²¹ / r²

2.24 = 5.97632×10¹¹ / r²

Cross multiply

2.24 × r² = 5.97632×10¹¹

Divide both side by 2.24

r² = 5.97632×10¹¹ / 2.24

r² = 2.668×10¹¹

Take the square root of both side

r = √2.668×10¹¹

r = 516526.863 m

Thus, the radius of the planet is 516526.863 m

Each of the five friends needs to pay £12 to cover the cost of their own meals and contribute towards the birthday person's meal. Using mean allows us to distribute the cost equally among the friends, ensuring a fair division of expenses for the meal.

To determine how much each of the five friends needs to pay, we can use the concept of averages (mean) and divide the total cost by the number of people paying.

In this scenario, the total cost of the meal for 6 people is £12 per person. Since the other 5 friends have decided to pay for the birthday person's meal, they will collectively cover the cost of their own meals plus the birthday person's meal.

To calculate the total cost covered by the five friends, we can subtract the cost of one person's meal (since the birthday person's meal is being paid by the group) from the total cost. The cost of one person's meal is £12.

Total cost covered by the five friends = Total cost - Cost of one person's meal

= (£12 x 6) - £12

= £72 - £12

= £60

Now, to find out how much each of the five friends needs to pay, we divide the total cost covered by the five friends (£60) by the number of friends (5).

Amount each friend needs to pay = Total cost covered by the five friends / Number of friends

= £60 / 5

= £12

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Answer:

There are many advantages of geothermal energy but also some challenges ... than the air, it can act as a heat sink/ source with a geothermal heat pump just ... The largest single disadvantage of geothermal energy is that it is location specific. ... energy does not typically release greenhouse gases, there are many of these .

The advantage of using geothermal energy is that It reduces greenhouse emissions. Geothermal energy has a lot of advantage.

Geothermal energy is the thermal energy in the Earth's crust that comes from the planet's creation and radioactive decay of components in nearly equal amount.

The advantage of using the geothermal energy is;

A. It is available only in limited areas.

B. It can cause air and groundwater pollution.

C. It is difficult to transport from place to place.

Following is an advantage of using geothermal energy

D. It reduces greenhouse emissions.

Hence, option D is correct.

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Answer:

\(7.2 \times 10 {}^{11} newton\)

Explanation:

\(the \: magnitude \: of \: the \: forc \: e \: can \: be \: calculated \: using \: coulombs \: formular \\ f = \frac{k \times q1 \times q2}{d {}^{2} } \\ f = \frac{9 \times 10 {}^{9} \times 100 \times 20 }{5 {}^{2} } \\ f = \frac{18000 \times 10 {}^{9} }{25 } \\ f = \frac{18000000000000}{25} \\ f = 7.2 \times 10 {}^{11} newton\)

When light strikes a green opaque object, the green wavelength of light is absorbed, while all other wavelengths of visible light are reflected.

A green object appears green to our eyes because it selectively absorbs all wavelengths of visible light except for the green wavelength of light, which is reflected back to our eyes.

When light strikes a green opaque object, the green wavelength of light is absorbed by the object. This means that the green light is not reflected or transmitted, but rather it is absorbed by the object.

When light is absorbed by an opaque object, the energy of the absorbed light is converted into other forms of energy, such as thermal energy. This is because the absorbed light energy causes the atoms in the object to vibrate, which in turn generates heat energy.

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Answer:

kinetic energy will change by a factor of 1/2

Option C) 1/2 is the correct answer

Explanation:

Given the data in the question;

we know that;

Kinetic energy = 1/2.mv²

given that mass of the object is doubled; m1 = 2m

speed is halved; v1 = V/2

Now, New kinetic energy will be; 1/2.m1v1²

we substitute

Kinetic Energy = 1/2 × 2m × (v/2)²

Kinetic Energy = 1/2 × 2m × (v²/4)

Kinetic Energy = 1/2 × m × (v²/2)

Kinetic Energy = 1/2 [ 1/2mv² ]

Kinetic Energy = 1/2 [ KE ]

Therefore; kinetic energy will change by a factor of 1/2

Option C) 1/2 is the correct answer

2.1. The acceleration of the ball immediately after it leaves the girl's hand is -9.8 m/s², directed downwards.

2.2. Yes, the ball is in free fall while it moves downwards. This is because the only force acting on the ball is gravity, which is a constant downward force.

The magnitude of the velocity with which the ball hits the floor can be calculated using the equation v² = u² + 2as, where u is the initial velocity, a is the acceleration, v is the final velocity, and so is the distance traveled. In this case, u = 8 m/s, a = -9.8 m/s², and s = 1.8 m. Plugging these values into the equation, we get v = √ (8² - 2 × (-9.8) × 1.8) = √ (64 + 35.28) = √ (99.28) = 9.96 m/s.The time it takes for the ball to hit the floor can be calculated using the equation t = (v-u)/a, where t is the time, v is the final velocity, a is the acceleration and u is the initial velocity. In this case, v = 9.96 m/s, u = 8 m/s, and a = -9.8 m/s². Plugging these values into the equation, we get t = (9.96 - 8)/-9.8 = 1.97 s.

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Given,

The length of the string, L₁=25.4 cm

The fundamental frequency, f₁=440 Hz

The new frequency, f₂=523.3 Hz

The frequency of a standing wave is related to the length of the string as,

On rearranging the above equation,

Where L₂ is the shortened length of the string.

On substituting the known values,

Therefore the shortened length of the string in order to produce the required frequency is 21.36 cm.

The two locations on the x-axis where the electric potential is zero are

x₁ = 1.00 m and x₂ = 1.00 m.

To find the two locations on the x-axis where the electric potential is zero, we can use the formula for the electric potential due to a point charge:

V = kq/r

where V is the electric potential, k is Coulomb's constant (9 x 10⁹ N m²/C²), q is the charge, and r is the distance between the point charge and the location where we want to find the electric potential.

Let's call the unknown distances on the x-axis from the charge at the origin as x₁ and x₂.

The electric potential:

V₁ = k(-3.00 x 10-6 C)/x₁ and V₂ = k(8.00 x 10-6 C)/(2.00 - x2).

The total electric potential at any position on the x-axis is the algebraic sum of the electric potentials owing to the two charges since the electric potential due to each charge is a scalar quantity so,

V = V₁ + V₂

We want to find the two values of x₁ and x₂ that make V = 0. Setting V to zero and rearranging the terms, we get:

k(-3.00 x 10⁻⁶ C)/x₁ + k(8.00 x 10⁻⁶ C)/(2.00 - x₂) = 0

Multiplying both sides by x₁(2.00 - x₂),

-3.00 x 10⁻⁶ (2.00 - x₂) + 8.00 x 10⁻⁶ x₁ = 0

Expanding and rearranging, we get:

8.00 x 10⁻⁶ x₁ = 6.00 x 10⁻⁶ x₂ - 4.00 x 10⁻⁶

x₁ = 1.00 m and x₂ = 1.00 m are the two points where electric potential is zero on x axis  

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The gravitational potential energy of the mass in increased approximately by 490 J

Gravitational Potential energy formula is

P=mgh

where mass is given my m= 5 Kg

g is the gravitational force i.e. 9.8 \(m/s^{2}\)

h is the height above the ground that is given by 10 m

P = 5*9.8*10

P = 490 J

What is gravitational potential energy?

The potential energy that a huge item has in relation to another massive object due to gravity is known as gravitational energy or gravitational potential energy. When two objects descend toward one another, the potential energy associated with the gravitational field is released (transformed into kinetic energy).

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Answer:

0 atomic mass because it widens as the numerical value represents

Answer: ATOMIC MASS

Explanation:

I got it right

If F₁ has a greater magnitude than F₂, the box will accelerate backward because the net force is in the backward direction (1st option)

To obtain the direction in which the box will move, we shall determine the net force acting on the box. This is illustrated below:

Assumption:

Net force = Magnitude of force 1 (F₁) - Magnitude of force 2 (F₂)

Net force = F₁ - F₂

Net force = 40 - 25

Net force = 15 N backward

From the above illustration, we can see that the net force is 15 N backward.

Thus, we can conclude from the box will accelerate backward (1st option)

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Answer:

Explanation:

no of turns per unit length n = 514 / .21 = 2447.62 per meter .

magnetic field in solenoid = μ₀ nI

= 4π x 10⁻⁷ x 2447.62 x I = 3.07 x 10⁻³ I  T

magnetic flux through the small coil = 14 x 3.07 x 10⁻³ x π x 1.3² x10⁻⁴ I

φ= 72.63 x 10⁻⁷ I  Web

emf induced in it

= dφ / dt = 72.63 x 10⁻⁷ dI / dt

= 72.63 x 10⁻⁷ x ( 2.79 - .3) / .8

= 226 x 10⁻⁷ V

= 22.6 x10⁻⁶ V

= 22.6 μ V .

Answer:

12J

Explanation:

Right before it hits the ground, the initial potential energy and the final kinetic energy will equal each other due to conservation of energy.

The mass of the fish on the end of the pole, in kilograms m =2.090Kg.

What is Force?

Force is an influence that can cause an object to change its motion, direction, shape, or other physical attributes. Forces can be applied to objects, creating a change in their acceleration, velocity, or momentum. Forces can be either contact forces, such as pushing or pulling on an object, or non-contact forces, such as gravity, magnetism, and electricity. Forces can be described in terms of magnitude, direction, and point of application. Magnitude is the strength of the force, direction is the path the force is applied, and point of application is the point on the object where the force is applied. Forces can also be classified as balanced or unbalanced. Balanced forces occur when two forces of equal magnitude and opposite direction act on an object, resulting in no net force. Unbalanced forces occur when two forces of unequal magnitude act on an object, resulting in a net force.

Given that,

F2 = 240N

Angle = 83.5 degree

Length = 4.1m

Distance = 0.35m

How much force, F1 in newtons ?

What kind of fish is that hanging off the end of the pole?

Thus,

Calculating Torque about ‘A’

For equillibrium ∑τa= 0

F1 * L + F2 * (L – d) = 0

F1 * L= - F2* (L – d)

F1L SinΘ= F2(L – d) SinΘ

F1 = F2 (L – d)/L

F1 = 240 (4.1 – 0.35)/4.1

F1 = 219.51N

For equillibrium ∑ Fnet = 0

F2 + F1 + mg = 0

mg = F2- F1

m = F2 - F1/ g

m = 2.090Kg

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Therefore, of the three options given, the electromagnet with more coils around the metal rod is the most powerful if all other factors such as current and core material are kept constant.

What is the very short response to an electromagnet?

An electromagnet is a temporary magnet made by winding a wire around an iron core. When current flows through the coil, iron becomes a magnet, and when the current is cut off, it loses its magnetic properties.

What is Electromagnetism?

Electromagnetism is the branch of physics that deals with the electromagnetic forces that occur between charged particles. Electromagnetic force is one of the four basic forces and describes the electromagnetic field.

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Answer: The answer is B

Explanation:

Answer:

v = 2099.5 km/h, v' =  -618.8 km/h

or

v =-1996.6 km/h, v' = 721.7 km/h

Explanation:

From the law of conservation of momentum,

Total momentum before collision = Total momentum after collision

For elastic,

mu+m'u' = mv+m'v'..................... Equation 1

Total kinetic energy before collision is equal to total kinetic energy after collision

mu²+m'u'² = mv²+m'v'²............. Equation 2

Where m and m' are the mass of the car and truck respectively, and u and u' are the initial velocity of the car and the truck respectively, v and v' are the final velocity of the car and the truck respectively.

Given: m = 1800000 g = 1800 kg, m' = 5500 kg, u = 150 km/h, u' = 100000 km/h

Substitute these values into equation 1 and 2

1800(150)+5500(100000) = 1800v+5500v'

1800v+5500v' = 375500................... Equation 3

1800(150²) +5500(100000²) = 1800v²+5500v'²...................... Equation 4

Solving equation 3 and 4 simultaneously,

v = 2099.5 km/h, v' =  -618.8 km/h

or

v =-1996.6 km/h, v' = 721.7 km/h

Answer:

ACM = 2.5

Explanation:

The common mode rejection ratio, is a parameter that is used to measure the ability of an Operational-Amplifier, to reject or eliminate the noises of same polarity. The common mode rejection ratio is given by the following formula:

CMMR = AV/ACM

for the value of CMMR in deciBels (dB), the formula becomes:

CMMR = 20 log(AV/ACM)

where,

CMMR = Common Mode Rejection Ratio = 100 dB

AV = Open Loop Gain = 250000

ACM = Common Mode Gain = ?

Therefore,

100  = 20 log (250000/ACM)

100/20 = log (250000/ACM)

10⁵ = 250000/ACM

ACM = 250000/10⁵

ACM = 2.5

Answer:

C

Explanation:

A feather falls from one end of a tube to the other inside a vacuum.

Answer:

a) A Helium nucleus with two protons and one neutron

b) 0.324 of the original amount

Explanation:

a) When Tritium decays, the nucleus emits an electron and an antineutrino, which then changes it from a Triton with one proton and two neutrons, to a Helium nucleus with two protons and one neutron.

The decay constant for the decay of Tritium is gotten from

\(t_{1/2}\) = 0.693/k

where

\(t_{1/2}\) is the half life = 12.3 yrs

k is the decay constant = ?

substituting, we have

12.3 = 0.693/k

k = 0.693/12.3 = 0.0563

The fraction that will remain after 20 years can be calculated from

\(N\) = \(N_{0} e^{-kt}\)

where

\(N\) is the final remaining amount of Tritium after 20 years

\(N_{0}\) is the original amount of Tritium

k is the decay constant = 0.0563

t is the time = 20 years

Equation can be re-written as

\(N/N_{0}\) = \(e^{-kt}\)

where

\(N/N_{0}\) is the fraction of the tritium that will be remaining after 20 years.

substituting values, we have

\(N/N_{0}\) = \(e^{-0.0563 * 20}\)

\(N/N_{0}\)  =  \(e^{-1.126}\)

\(N/N_{0}\) = 0.324 of the original amount

Answer:Velocity

Explanation:

Velocity is directly proportional to the frequency of a wave.

Velocity=frequency x wavelength

Answer: Three forces act significantly on a freely floating helium-

filled balloon: gravity, air resistance (or drag force), and a

buoyant force.

Explanation:

The air pressure on the bottom of the balloon is slightly higher than the air pressure on the top of the balloon (because of the altitude difference). This difference gives rise to the bouyant force. This force competes with gravity as the two main forces acting on the balloon. Every time your feet hit the ground when you are running, the ground hits your feet with an equal and opposite force. Newton’s third law explains how balloons and rocket engines work. When the neck of an inflated balloon is released, the stretched rubber material pushes against the air in the balloon. The air rushes out of the neck of the balloon.

Option (A) is correct. As nuclear fission uses heavy nuclei to break into smaller fragments whereas nuclear fusion uses lighter nuclei to make heavier nuclei.

The instantaneous speed of the ant at t=8s is equal to the slope of the segment between t=7s and t=9s, which is 1.5m/s.

To find the instantaneous speed of the ant at time t=8s, we need to calculate the derivative of the displacement function with respect to time. Since the displacement of the ant is given by a piecewise function, we need to differentiate each segment of the function separately and then piece them together. From 0s to 4s, the displacement of the ant decreases linearly from 6m to 2m. The slope of this segment is -1m/s. From 4s to 7s, the displacement of the ant is constant at 2m. The slope of this segment is zero. From 7s to 9s, the displacement of the ant increases linearly from 2m to 5m. The slope of this segment is 1.5m/s. Finally, from 9s to 10s, the displacement of the ant is constant at 5m. The slope of this segment is zero.

Therefore, the instantaneous speed of the ant at t=8s is equal to the slope of the segment between t=7s and t=9s, which is 1.5m/s. This means that the ant is moving upwards at a constant speed of 1.5m/s at time t=8s. It's important to note that the instantaneous speed of the ant tells us how fast it's moving at a specific moment in time. It's not the same as the average speed over a given time interval, which would be calculated by dividing the total displacement by the total time elapsed.

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