one of the early hypotheses to explain the high redshifts of quasars is that quasars were ejected from galaxies at very high speeds. this idea was rejected, because no quasars with large blueshifts have been found. explain why we would expect to see quasars with both blueshifted and redshifted lines if they were ejected from nearby galaxies.

A certain lake, filled with fresh water, is 40 m deep and located at sea level. The absolute pressure (in kpa) at the bottom of the lake will be 492.1 kPa

P1 = rho * g * h

rho = density of water

g = acceleration due to gravity

h = depth

P1 = rho * g * h

   = 997 * 9.8 * 40 = 390824  N / \(m^{2}\) = 390.8 kPa

P(absolute pressure) =  Po + P1

  =   101.3 + 390.8  = 492.1 kPa

The absolute pressure (in kPa) at the bottom of the lake will be 492.1 kPa

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a) The work done is 450 kJ

b) The kinetic energy gets lesser with time

c) The relation is v^2 = u^2 - 2as

d) The initial velocity is 30 m/s

We know that the work that is done is the product of the force and the distance that is moved by a body. We know that work is said to be done when the force that is applied moves a distance in the direction of the force.

1) Work done = Force * distance

= 6000 N * 75 m

= 450 kJ

2) The kinetic energy of the automobile would decrease with time.

3) To obtain the initial velocity we have to use the relation;

v^2 = u^2 - 2as

v = final velocity

u = initial velocity

a = acceleration

s = distance covered

Given that;

F = ma

a = F/m

a = 6000 N / 1000-kg

a = 6 m/s^2

The we have;

0^2 = u^2 - (2 * 6 * 75)

u^2 =  (2 * 6 * 75)

u = √ (2 * 6 * 75)

u = √900

u = 30 m/s

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A hypothesis is a tentative prediction wave about how empirical events or attributes will be related or patterned. However, they are not proven to be true or false, but rather supported or rejected based on empirical evidence.

A hypothesis is a statement that proposes a relationship between two or more variables and is testable through empirical research. It is an educated guess that is made based on prior knowledge, observation, and theories. Hypotheses are important in the scientific method as they guide the research process and provide a framework for collecting and analyzing data.

A hypothesis is an educated guess based on existing knowledge and observations. It serves as a starting point for further investigation and testing through experimentation or data analysis. By stating a hypothesis, researchers can make predictions and design experiments to test the validity of their hypothesis, ultimately contributing to the development of scientific knowledge.

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The energy stored by the capacitor when the current in the circuit is 2.0 mA is 20.0 μJ.


We can use the formula for the energy stored in a capacitor, which is:

E = 0.5 × C × V^2

Where E is the energy stored, C is the capacitance, and V is the voltage across the capacitor.

When the switch is at position b, the capacitor is uncharged, so the voltage across it is 0 V. When the switch is moved to position a, the capacitor starts to charge, and the voltage across it increases as a result. The current in the circuit is given as 2.0 mA.

To find the voltage across the capacitor, we can use Ohm's law:

V = I × R

Where V is the voltage, I is the current, and R is the resistance. The resistance in this circuit is 1 kΩ, so:

V = (2.0 × 10^-3 A) × (1 × 10^3 Ω) = 2.0 V

Now we can calculate the energy stored by the capacitor:

E = 0.5 × C × V^2

We are not given the capacitance, so we cannot find the energy directly. However, we can use another formula that relates capacitance, current, and time:

Q = C × V

Where Q is the charge stored on the capacitor. We know that the capacitor is uncharged when the switch is at position b, so the charge on the capacitor when the switch is at position a is:

Q = C × V

Where V is the voltage across the capacitor, which we found to be 2.0 V. The current in the circuit is 2.0 mA, so the time it takes for the capacitor to charge to this voltage is:

t = Q / I

Where t is the time, Q is the charge on the capacitor, and I is the current. Substituting the values we have:

t = (C × V) / I

We can rearrange this equation to find C:

C = (I × t) / V

We are not given the time, but we can use another formula to find it:

V = V0 × (1 - e^-t/RC)

Where V0 is the initial voltage (0 V in this case), R is the resistance (1 kΩ), C is the capacitance (which we are trying to find), and e is the natural logarithm base (approximately 2.71828). Solving for t:

t = -RC × ln(1 - V / V0)

Substituting the values we have:

t = - (1 × 10^3 Ω) × ln(1 - 2.0 V / 0 V)

Note that ln(1 - x) is undefined for x ≥ 1, so this formula gives us a negative time. This means that the capacitor will never fully charge in this circuit, because the voltage across it would have to exceed the voltage of the battery, which is 3.0 V. However, we can still use the formula we found for C:

C = (I × t) / V

Substituting the values we have:

C = (2.0 × 10^-3 A) × (- (1 × 10^3 Ω) × ln(1 - 2.0 V / 0 V)) / 2.0 V

C ≈ 2.72 μF

Now we can finally calculate the energy stored by the capacitor:

E = 0.5 × C × V^2

Substituting the values we have:

E = 0.5 × (2.72 × 10^-6 F) × (2.0 V)^2

E ≈ 20.0 μJ

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The ducks should head in a direction approximately 52.85 degrees south of west in order to move directly south.

To determine the direction the ducks should head in order to move directly south, we need to consider the vector addition of their airspeed and the wind velocity. The resulting vector will give us the direction they should fly.Let's break down the velocities into their respective components. The wind velocity is blowing from the west, so its x-component is 13 m/s (negative since it is in the opposite direction of motion), and its y-component is 0 m/s.

The ducks' airspeed is 17 m/s, and since they want to move directly south, their desired velocity is purely in the negative y-direction. Therefore, the ducks' airspeed has an x-component of 0 m/s and a y-component of -17 m/s.

To determine the resulting velocity, we add the x-components and y-components separately:

Resultant x-component = 13 m/s + 0 m/s = 13 m/s (westward)

Resultant y-component = 0 m/s + (-17 m/s) = -17 m/s (southward)

Now we can find the magnitude and direction of the resultant velocity using trigonometry. The magnitude is the square root of the sum of the squares of the x-component and y-component:

Magnitude = sqrt((13 m/s)^2 + (-17 m/s)^2) ≈ 21.40 m/s

The direction is given by the arctangent of the y-component divided by the x-component:

Direction = arctan((-17 m/s) / (13 m/s)) ≈ -52.85 degrees

Therefore, the ducks should head in a direction approximately 52.85 degrees south of west in order to move directly south.

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penguins! so momentum is based on mass and velocity, the advantages is that they have stored mass in the form of like fats to keep them warm however they are built to slide basically so that there is less friction when they travel so sideways their bullet like shape helps increase velocity so they have both mass and considerable velocity!

The bike's velocity after 5.0 s when a motorcyclist of mass 60 kg rides a bike of mass 40 kg is 10m/s

Given mass of motorcyclist (m) = 60kg

mass of bike (m2) =40kg

Force exerted on bike (F) = 200N

Assuming that the total force on the bike remains constant.

Time taken (t) = 5s

Velocity of bike = v

We know that from newtons laws of motion F = Ma where a is the acceleration. v = u+at where u is the initial velocity = 0. Then a = v/t

So F = Mv/t

Here M be total mass = m1+m2

Then Fnet = (m1+m2) x v/t

v = F x t/(m1+m2) = 200 x 5/(40+60) = 10m/s

Hence Velocity of bike = 10m/s

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Answer:

Ethical Guidelines for Research With Human Subjects

Participation Must Be Voluntary.

Researchers Must Obtain Informed Consent.

Researchers Must Maintain Participant Confidentiality

Explanation:

Basta Yun na yan correct me if I'm wrong hehehhe

Rounded to the nearest thousandth, the work done in stretching the spring to 50 meters is approximately 102.000 J.

To calculate the work done in stretching the spring, we can use the formula:

\(Work = (1/2) * k * (x^2 - x_0^2)\)

Where:

k is the spring constant,

x is the final displacement,

\(x_0\) is the initial displacement.

First, we need to determine the spring constant (k). The spring constant represents the stiffness of the spring and is typically given in units of N/m (newtons per meter).

Next, we calculate the initial displacement (\(x_0\)) and the final displacement (x).

Given:

Initial length of the spring (\(x_0\)) = 30 meters

Final length of the spring (x) = 50 meters

Force applied to the spring = 61.2 N

The force applied to the spring is related to the displacement by Hooke's Law:

F = k * x

Rearranging the equation, we can solve for the spring constant:

k = F / x

k = 61.2 N / 30 m

k ≈ 2.04 N/m

Now, we can calculate the work done:

\(Work = (1/2) * k * (x^2 - x_0^2)\)

\(Work = (1/2) * 2.04 N/m * ((50 m)^2 - (30 m)^2)\)

Work ≈ 102.0 J

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At the instant of heel strike, the torque created by the GRF usually pushes the knee into a position of flexion.

The knee joint undergoes several biomechanical changes throughout the gait cycle. At the time of heel strike, the GRF or ground reaction force produces a torque that usually pushes the knee joint into a position of flexion. This response results from the rapid forward movement of the body and leg after heel contact. The GRF acting through the foot causes a moment that tends to extend the knee, but the hamstrings contract eccentrically to resist this motion and allow the knee to flex.

The knee joint's stability during gait is influenced by numerous factors, including muscle strength, joint laxity, ligamentous stability, and joint alignment. The knee undergoes flexion and extension movements during normal gait. During the gait cycle, the knee joint flexes when the foot strikes the ground, and it extends when the foot pushes off the ground.

The quadriceps femor is muscle group acts as the primary extensor of the knee joint, while the hamstrings act as flexors. The gastrocnemius and soleus muscles aid in plantar flexion of the ankle and knee joint flexion. The GRF is the force exerted by the ground on the foot, which propels the body forward during walking. The force is greater during the stance phase of gait and is proportional to the body's weight.

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Answer:

40 kg

Explanation:

F = ma

F / a = m

2400 / 60  = 40 kg

Answer:

The North Pole.

Explanation:

According to the Lenz's law of electromagnetic induction, an induced elemagnetic force tends to give rise to the current. In reaction, this current's magnetic field try to oppose any replacement in the magnetic flux.

So,  as per the law of Lenz's electromagnetic induction, when the current passes in a coil in anti-clockwise direction, this will produce the opposite end of the coil in the north pole.

So, the correct answer is north pole.

The graph in which the block will travel with the greatest speed is the graph with the greatest displacement at given equal forces.

Based on the principle of work energy theorem, the work done in moving the block against the frictionless floor is equal to the kinetic energy.  

K.E = ¹/₂kx²

K.E = ¹/₂Fd

¹/₂mv² = ¹/₂Fd

mv² = Fd

v² = Fd/m

v = √ (Fd/m)

Thus, the graph in which the block will travel with the greatest speed is the graph with the greatest displacement at given equal forces.

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Answer:

Cytokines

Explanation:

Cytokines are known as inflammatory molecules which are also proteinous and aid signaling of certain processes and conditions in the body.

They are also normally involved in aiding muscle building and are released when muscles experience microscopic damage which may lead to the muscles being sore.

Answer:

6000pa

Explanation:

force= 2400N

area= 0.4m

pressure=?

now,

p= f/a

p= 2400/ 0.4

therefore,P=6000 pa.

Four gametes will be affected if nondisjunction takes place. A new, unique progeny is produced during sexual reproduction when the sex cells known as gametes—eggs in females and sperm in males—combine.

After fertilization, children born to gametes with abnormal chromosomal numbers due to nondisjunction will also have abnormal chromosomal numbers. If nondisjunction takes place during Meiosis I in humans, two gametes without a chromosome and two gametes with extra chromosomes (24 each, or n+1) will be produced (22 chromosomes each, n-1 ). There may be one missing chromosome or up to n+1 chromosomes in each gamete (one extra). I've included a link to an animation that shows meiosis and non-disjunction in action.

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Answer:

27.1 m/s

Explanation:

Given that at a race car driving event, a staff member notices that the skid marks left by the race car are 9.06 m long. The very experienced staff member knows that the deceleration of a car when skidding is -40.52 m/s2.

Using third equation of motion,

V^2 = U^2 + 2aS

Since the car is decelerating, the final velocity V = 0

Substitute all the parameter into the equation above,

0 = U^2 - 2 * 40.52 * 9.06

U^2 = 734.22

U = \(\sqrt{734.22}\)

U = 27.096

U = 27.1 m/s  approximately

Therefore, the staff member can estimate for the original speed of the race car to be 27.1 m/s if it came to a stop during the skid

A magnetic field, which is a vector field, has an impact on magnetic materials, electric charges, and electric currents in a similar manner. A moving charge in a magnetic field is subject to a force that is perpendicular to the magnetic field and has its own speed.

The current I is flowing through a circular coil A, which has the radius R. If 2I is the current flowing through another circular coil B with radius 2R, then the magnetic field at the center of the coil is in the ratio of (i.e., BA to BB).

An electrical circuit's restriction to current flow is measured in terms of resistance. The Greek letter omega (Ω) represents resistance, which is measured in ohms.

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Answer:

\(speed = \frac{distance}{time}\)

Explanation:

The equation linking speed, distance and time is speed equals to distance divided by time!

Hope this helps! Have a great day :)

An equation that will let you calculate the last Q that was needed for this temperature change is Q = MCΔT.

The following formula can be used to determine how much heat is required to cause a change in temperature:

Q = MCΔT

Where:

The required heat, Q, is expressed in joules (J).

M is the substance's mass, expressed in grams (g)

C is a substance's specific heat capacity expressed in J/g°C.

T is the change in temperature expressed in degrees celsius (°C).

As a result, we can determine how much heat is required to change the temperature as follows:

Q = MCΔT

Q = 420 x 3.52 x 43.8

Q = 64753.92 J

Thus, 64753.92 J of heat are required to change the temperature.

Your question is incomplete but most pprobably your full question was

The specific heat capacity of a pure substance can be found by dividing the heat needed to change the temperature of a sample of the substance by the mass of the sample and by the change in temperature. The specific heat capacity of a certain substance has been measured to be 3.52 J/g °C. Suppose 420.0 g of the substance is heated until the temperature of the sample has changed by 43.8 °C.

Write an equation that will let you calculate the last Q that was needed for this temperature change. Your equation should contain only symbols. Be sure to define each symbol.

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The average force on the puck by the stick is 448 N

To find the average force on the hockey puck, we can use the impulse-momentum theorem:

Impulse = Change in momentum

The impulse on the puck can be calculated as:

Impulse = mass x change in velocity
Impulse = 0.16 kg x (9 m/s - (-5 m/s))
Impulse = 0.16 kg x 14 m/s
Impulse = 2.24 N*s

The change in velocity is negative because the puck is moving in the opposite direction after the impact.

The impulse on the puck is equal to the average force multiplied by the time of contact:

Impulse = average force x time
2.24 N*s = average force x 0.005 s
average force = 2.24 N*s / 0.005 s
average force = 448 N

Therefore, the average force is 448 N.

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The heat transfer into this engine is 52.7%.

Solution:

9.5 + 8.5

Hi = 18KJ

n = w/Hi

= 9.5/18 x 100

= 52.7%

Heat transfer is the field of thermal engineering concerned with the production use conversion and exchange of thermal energy between physical systems. Heat transfer is classified into different mechanisms such as. Conduction convection radiation and energy transfer through a phase change.

There are three ways heat is transferred conduction convection and radiation. Heat transfer between states of matter occurs whenever there is a temperature difference, and heat transfer only occurs in the direction of decreasing temperature, that is, from a hot body to a cold body.

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The statement which accurately describes the mass of the watermelon is:

The mass of the watermelon is greater than 2 kg.

Option c is the correct answer

Fundamental quantities are the quantities which forms the basic unit of measurement. In order words, these are the quantities upon which other quantities and units are derived from.

The three examples of fundamental quantities are:

Other examples of fundamental quantities are:

So therefore, the statement which accurately describes the mass of the watermelon is:

The mass of the watermelon is greater than 2 kg.

Complete question:

Compare the mass of the two objects.

Which statement accurately describes the mass of the watermelon?

a. The mass of the watermelon is less than 2 kg.

b. The mass of the watermelon is equal to 2 kg.

c. The mass of the watermelon is greater than 2 kg.

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When a body is moving in the same direction, its relative speed is 6m/s, while when it is moving in the opposite direction, it is 42 m/s.

The units used to measure speed and velocity are the same. The meter is the SI unit for measuring both distance and displacement. The second is the second as defined by the International System of Units. Two meters per second divided by two is the SI unit of velocity and speed.

It is calculable using an intermediary reference frame. The velocity vector sum can be used to represent this simply. vAB = vA - vB is the way to express the relative velocity formula.

velocity is the same as the relative velocities of A and B.

A=24,B=18

Vab=24-18=6m/s

In opposite direction

Vab=24-(-18)=42m/s

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A softer landing occurs when a falling object bounces from a surface. This is a common occurrence when an object with some degree of elasticity is dropped.

When it strikes a surface, the object's kinetic energy is transformed into potential energy. When it bounces back, some of that potential energy is transformed back into kinetic energy, resulting in a bounceback.A softer landing occurs when a falling object bounces from a surface due to elasticity.

For instance, when a ball is dropped, it hits the ground, and a softer landing occurs when the ball bounces from the ground, causing it to absorb less impact than if it had just hit the ground. Soft landings can happen when a surface is made of a soft or elastic material that can deform and absorb some of the impact, reducing the force of the landing.A ball with more elasticity will bounce higher than a ball with less elasticity.

This is due to the fact that a ball with higher elasticity will rebound with more kinetic energy, resulting in a higher bounce. A softer landing can also occur if the surface that the object lands on is cushioned or padded, such as when a person jumps onto a foam mat.

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The minimum height h that the block of mass m must start from to make it around the circular loop-the-loop without falling off depends on the gravitational potential energy the block has at the top of the track compared to the minimum kinetic energy it needs to maintain circular motion at the top of the loop.

At the top of the track, the block has potential energy equal to mgh, where g is the acceleration due to gravity and h is the height of the block above the bottom of the loop. At the top of the loop, the block must have a minimum kinetic energy equal to the difference between its potential energy at the top of the track and the potential energy it has at the top of the loop, which is equal to mgR.

Therefore, the minimum height h can be found by equating the potential energy at the top of the track with the kinetic energy required at the top of the loop:

mgh = 1/2mv^2 + mgR

where v is the speed of the block at the top of the loop. Since the block must maintain circular motion at the top of the loop, its speed can be related to the radius of the loop and the acceleration due to gravity by the centripetal force equation:

mv^2/R = mg

Solving for v^2 and substituting it into the previous equation gives:

h = 5R/2

Therefore, the block must start from a height of 5/2 times the radius of the loop to make it around without falling off. The answer is given as a multiple of R, so the final answer is:

h = 2.5R

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According to the law of conservation of energy, energy cannot be created or destroyed.

When work is done, energy is changed from one form to another.

From this we can analyse and find out the answer is:

B) the total amount of energy for a system stays the same.

it is because energy is never destroyed or created. always stays same but in different forms.

Answer:

A isolate the DNA From a sample of cells

First we need to first understand what inertia is. Inertia is the tendency of an object to resist a change in its state of motion. When driving a car, the inertia of the car and its passengers can be affected by sudden braking or accelerating.

To minimize the effect of inertia on your body while driving, there are a few things you can do. First, always wear your seatbelt. This will help to keep you in your seat and reduce the chance of being thrown forward in the event of sudden braking or an accident.

Second, drive at a safe speed and avoid sudden changes in speed or direction. When you slow down gradually or take turns slowly, you reduce the force acting on your body and minimize the effects of inertia.

Third, maintain a safe distance from other vehicles on the road. This will give you more time to react to sudden changes in traffic flow, and avoid having to brake or accelerate suddenly.

Lastly, consider the design of your vehicle. Cars with better suspension systems, more comfortable seats, and higher safety ratings will help to minimize the effects of inertia on your body while driving.

In summary, to minimize the effect of inertia on your body while driving, wear your seatbelt, drive at a safe speed, maintain a safe distance from other vehicles, and consider the design of your vehicle.

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