An eagle is flying around and its velocity v as a function of time t is given in the graph below where
rightwards is the positive velocity direction.

Given:

The initial height of the ball, h=1.6 m

The initial speed of the ball, u=14 m/s

To find:

a) The time of flight of the ball.

b) The range of the ball.

Explanation:

As the ball is thrown horizontally, the ball will have no vertical component of the initial velocity. The velocity of the ball is completely horizontal.

Thus the vertical component of the initial velocity of the ball is u_y=0 m/s.

The horizontal component of the initial velocity of the ball is u_x=u=14 m/s.

a)

From the equation of motion,

Where g is the acceleration due to gravity and t is the time of flight of the ball.

On substituting the known values,

b)

The range of the ball is given by,

On substituting the known values,

Final answer:

a) The time of flight of the ball is 0.57 s

b) The range of the ball is 7.98 m

According to the law of supply, a cornerstone of economic theory, an increase in price causes a rise in the amount provided while other variables remain constant.

In other words, there is a direct correlation between price and quantity, with quantities responding to changes in price in the same manner. This indicates that manufacturers are prepared to increase output as a strategy to boost earnings by putting more of a product on the market for sale at higher prices.

The rising slope of the supply curve is caused by the law of supply, which is an association between the amount provided and the price that is positive.

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Answer:

it's gravitational potential energy would have converted to kinetic energy half way back when it's falls

The velocity of the hammer of mass 1.9 kg is 11.07 m/s.

Velocity is the rate of change of displacement.

To calculate the velocity of the hammer, we use the formula below.

Formula:

Where:

Substitute these values into equation 1

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Yes, The velocity of a ball is 1 m/s at a given instant of time. it is possible for the acceleration of the ball to be -1 at this instant.

If it is made sure that the other values are plugged in correctly, a positive velocity is capable of making a negative acceleration.

A moving item always experiences positive acceleration. An object that is slowing down always experiences negative acceleration. However it does not mean that negative acceleration always mean reduction in speed.

Deceleration always slows down motion. However, negative acceleration is just acceleration in the opposite direction according to the selected coordinate system. Negative acceleration might or might not be deceleration, and vice versa for negative acceleration.

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Answer:

colder because of moisture

The average velocity is given by

Where d is the distance covered and t is the time taken.

For the given case, we have

d = 75 m

t = 8.9 s

Therefore, the average speed of the hockey player is 8.43 m/s

The hockey player is moving at a speed of 9.5 m/s.

Answer:

Jsdiwkwdmxxj we

Explanation:

hcndjnjwidjxnwnjwi

The list of power sources from the lowest net energy to the highest net energy can be ordered as follows: a) PV (photovoltaic) cells, b) nuclear, and c) hydroelectric.

a) PV cells, also known as solar panels, convert sunlight directly into electricity. Although they are a renewable and environmentally friendly energy source, their net energy is relatively low compared to other sources. The efficiency of PV cells varies, but on average, it is around 15-20%. Their output depends on factors such as sunlight intensity, location, and the angle of installation.

b) Nuclear power comes from the process of nuclear fission, in which atoms of uranium are split to release a large amount of energy. Nuclear power plants are capable of producing a significant amount of electricity. However, the net energy of nuclear power is limited by the high costs of constructing and maintaining nuclear plants, as well as the management and disposal of radioactive waste. Despite these limitations, nuclear power has a higher net energy than PV cells.

c) Hydroelectric power is generated by harnessing the kinetic energy of flowing water to produce electricity. This method of energy production has the highest net energy among the three sources listed. Hydroelectric plants have high efficiency rates, typically around 90%, and are able to produce electricity consistently. Moreover, they have lower greenhouse gas emissions and a longer life span compared to other power sources. The major constraint for hydroelectric power is the availability of suitable locations with ample water resources, such as rivers and dams.

Hence the order would be a, b and then c.

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Answer:

Explanation:

Centripetal acceleration's equation is:

\(a_c=\frac{v^2}{r}\) where v is the velocity of the object (moon II) and r is the radius. We have the radius, but we don't have the velocity, and we can't solve for acceleration until we do have it. Assuming moon II is a circle, or close enough to be called a circle, it has a circumference.

C = 2πr. If we can find the circumference of the circle, we can plug in the orbital period for the time, the circumference for the distance, and solve for velocity in d = rt. So let's do that and see what happens.

C = 2(3.14)(9.0 × 10⁷) and

C = d = 5.7 × 10⁸. Plugging in and solving for v:

\(5.7*10^8=v(3.0*10^5)\) and

v = 1.9 × 10³. That is the velocity we can use in the centripetal acceleration equation.

\(a_c=\frac{(1.9*10^3)^2}{9.0*10^7}\) and

\(a_c=.040\frac{m}{s^2}\)

These are fun!

Velocity of Deidre and her dog is 2.11m/s.

=2.11m/s

Thus , we can conclude that the velocity of Deidre and her dog is 2.11 m/s towards north .

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Answer:

Therefore, when a light ray traveling through air enters water or glass it slows down, refracts, and bends toward the normal line. ... For example, when light goes from glass or water to air, it speeds up. Refraction changes how objects look.

Explanation:

The light slows down when it passes from the less dense air into the denser glass or water. This slowing down of the ray of light also causes the ray of light to change direction. It is the change in the speed of the light that causes refraction.

The light slows down when it passes from the less dense air into the denser glass or water. This slowing down of the ray of light also causes the ray of light to change direction. It is the change in the speed of the light that causes refraction.

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Answer:

The locus of points where the electric field due to these lines is zero is;

Along the line between the lines closer to line#1 than line #2

Explanation:

The charges on the parallel lines #1 and #2 = Positive linear charge

The charge density on line #2, λ₂ = 2 × The charge density on line #1, λ₁

Therefore, we have;

λ₂ = 2 ×  λ₁

Electric field strength, E, is given as follows;

\(E = \dfrac{\lambda}{2\cdot \pi\cdot \epsilon_0\cdot d}\)

Therefore;

\(E_1 = \dfrac{\lambda_1}{2\cdot \pi\cdot \epsilon_0\cdot d}\)

\(E_2 = \dfrac{\lambda_2}{2\cdot \pi\cdot \epsilon_0\cdot d} = 2 \times\dfrac{\lambda_1}{2\cdot \pi\cdot \epsilon_0\cdot d}\)

E₂ = 2·E₁

E₂/2 = E₁

E₂/(2·d) = E₁/d

The strength of the electric field at a given distance from line #2 is 2 times the strength of the electric field from line #1 at the same distance

Therefore the strength of the electric field will be the same at a point twice the distance from line #2 than from line #1 which is a point closer to line #1 than line #2.

1. c

2. c

3. c

4. b

im not really sure about number 2 but its the most logical anwser

Answer: Re-Horakhty

Explanation:

He has a human body and a falcon head, he has a crown in form of a disk with a cobra on his head. Ra-Horakhty was thought of as the god of the rising sun.

A student is creating an electromagnet for an investigation, and the one feature of the electromagnet that will have the least influence on the magnetic force is the brand of the battery, which is the last option.

The magnetic force of an electromagnet is determined by a number of factors, such as the material of the core and the number of wire coils, and the size of the power source but the brand of the battery don't have an effect on the magnetic force of the electromagnet as long as the battery provides the necessary voltage and current to power the electromagnet.

Hence, the one feature of the electromagnet that will have the least influence on the magnetic force is the brand of the battery, which is the last option.

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Approximately 65% of the participants in Milgram's experiment eventually used the highest setting on the shock generator - 450 volts - to shock the learners.

Milgram's study was conducted in the early 1960s and aimed to understand the extent to which people would obey an authority figure, even if it meant causing harm to another person. Participants were told to administer increasingly stronger electric shocks to a learner whenever they answered a question incorrectly. The shocks were not real, but the learner was an actor who pretended to be in pain. Despite this, many participants continued to administer the shocks, even when the learner was screaming in agony. Milgram's study highlighted the power of authority and the extent to which people can be influenced by those in positions of power. It also demonstrated the dangers of blindly following authority figures without questioning their actions. The study has been criticized for its ethical implications, but it remains an important landmark in social psychology, and its findings have influenced subsequent research on obedience and conformity.

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If the specific gravity of both the object and the liquid are equal at 0.900, this means that both the object and the liquid have the same density. In this case, the object will float.

This is because the buoyant force acting on the object is equal to the weight of the displaced liquid. Since the object and the liquid have the same density, the weight of the displaced liquid is equal to the weight of the object. Therefore, the buoyant force acting on the object is equal to its weight, and the object will float just beneath the surface of the liquid with some portion submerged.

It is important to note that if the specific gravity of the object was greater than the specific gravity of the liquid, the object would sink to the bottom of the liquid. Conversely, if the specific gravity of the object was less than the specific gravity of the liquid, the object would float on top of the liquid without sinking.

Answer:

the answer is

D.refraction

The light ray will bend downwards.

What is light ray?
A ray, in the field of optics, is a geometrical model of idealised light that is chosen to be perpendicular to a wavefronts of the real light and to point in the direction of energy flow. By segmenting the actual light field into discrete rays that are computationally perpetuated through the system using ray tracing techniques, rays are employed to model this same propagation of light thru an optical system. As a result, even extremely complex optical systems can be mathematically or computationally analysed. For as long as light ray travel through and around objects for whom the dimensions are significantly larger than the light's wavelength, approximate remedies to Maxwell's equations are appropriate for use in ray tracing.

The light will most likely follow the path that curves downward. This is because light rays bend towards the normal when entering a denser medium, such as water from air. The normal is an imaginary line perpendicular to the surface of the water. Therefore, the light ray will bend downwards.

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Hi there!

We can begin by calculating the total time of the ball's projectory:

t = d/v

t = 15/5 = 3 sec

We can use the simplified kinematic equation for time:

t = √2h/g

Rearrange to solve for h:

t² = 2h/g

gt² = 2h

gt²/2 = h

Plug in the values: (g = 9.8 m/s²)

9.8(3)² / 2 = 44.1 m

Answer:

A quantity which does not depend on direction is called a scalar quantity. Vector quantities have two characteristics, a magnitude and a direction. Scalar quantities have only a magnitude. When comparing two vector quantities of the same type, you have to compare both the magnitude and the direction.

I rarely share my notes. But these are my last year notes, so I can share with you. Click on the photo to view the answer.

Answer:65.28

Explanation:

A long string has a standing wave with 2 loops at a frequency. The speed of the waves in the string is 65.28 m/s

The frequency is the number of cycles completed per second.

Given the length of the string l = is 1.70 m, no of loops n =2, frequency of wave f =38.4 Hz, then the speed of the waves is

f = nv /2l

Substitute the following values, we get

v = 38.4 x 2 x 1.70 / 2

v =65.28 m/s

Thus, the speed of the waves in the string is 65.28 m/s.

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Answer:

According to Newton's Second Law of Motion :    

Where,

F = Force Applied

m = Mass of the object

a = Acceleration

Now, we will use this law to solve this question.

Given :

Acceleration or a = 15.3 m/s²

Force = 44 N

Mass = ?

Substitute, the given values in the formula.

F = ma

⇒ m = F/a

   m = 44/15.3

m = 2.9 kg

Answer:

7.0 n

Explanation:

The term you are looking for is "chemical battery". Chemical batteries work by converting chemical energy into electrical energy through a series of chemical reactions. These reactions take place within the battery's cells, which are composed of two electrodes and an electrolyte.

When the battery is connected to a circuit, the chemical reactions produce an electrical current that can be used to power devices. Chemical batteries are widely used in many applications, including consumer electronics, electric vehicles, and renewable energy systems. They are a crucial component of our modern technological society, and ongoing research is focused on developing more efficient and sustainable battery technologies to meet growing energy demands.

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Answer:

R= 602 .11 N

Explanation:

The horizontal component of tension T will give reaction of the wall and the vertical component of T will balance the weight of of the climber .

T cos32 = R

710 x .848 = R

R= 602 .11 N .

Answer: \(0.0039\ A\)

Explanation:

Given

Diameter of the rod \(d=2.54\ cm\)

length of rod is \(l=20\ cm\)

Resistivity of silicon is \(\rho=6.4\times 10^2\ \Omega-m\)

cross-section of the rod \(A\)

\(\Rightarrow A=\dfrac{\pi d^2}{4}\\\\\Rightarrow A=\dfrac{3.142\times 2.54^2\times 10^{-4}}{4}\\\\\Rightarrow A=5.067\times 10^{-4}\ m^2\)

Resistance of rod is  R

\(\Rightarrow R=\dfrac{\rho l}{A}\)

\(\Rightarrow R=\dfrac{640\times 0.20}{5.067\times 10^{-4}}\\\\\Rightarrow R=25.26\times 10^4\ \Omega\)

Current is given by

\(\Rightarrow I=\dfrac{V}{R}\\\\\Rightarrow I=\dfrac{1000}{25.26\times 10^4}\\\\\Rightarrow I=0.0039\ A\)