CS
A bicyclist steadily speeds up from rest to 9.00m/s in 3.10s.
How far did she travel during this time?
unit

The magnitude of the centripetal acceleration of the stopper, given that the rubber stopper has a mass of 16 grams is 1.9 m/s²

The centripetal acceleration can be obtained as illustrated by the following formula:

Centripetal acceleration = v² / r

Where

The following data were obtained where obtained from the question:

Centripetal acceleration = v² / r

Centripetal acceleration = (1.8)² / 1.7

Centripetal acceleration = 1.9 m/s²

Thus, the centripetal acceleration is 1.9 m/s²

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Answer:

change 20 min into hr = 0.33 hr

Explanation:

convert= divide the time by 60 because 60 mins make 1 hr

Answer:

The Answer is gonna be True

Explanation : A hydrogen bond is a weak type of force that forms a special type of dipole-dipole intermolecular attraction when a hydrogen atom is bonded directly to one of the most electronegative elements like nitrogen (N), oxygen (O) or fluorine (F). This causes the hydrogen to acquire a significant amount of positive charge.

Or

Hydrogen bond is an attractive force between a partially positive charged hydrogen and a partially negative charged atom (oxygen and nitrogen). This is a very weak bond and strength of hydrogen bond (5-10 Kcal per bond) is much less than the strength of covalent bond. Hydrogen bonds are usually showed as dotted lines between two atoms.

This is the Answer for your question :3

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Answer: The attraction of opposite charges between hydrogen and oxygen does not form a weak bond because oxygen-hydrogen makes hydrogen bonding. Hydrogen bonding is a very attraction force

If the applied voltage is polarised in the opposite direction (negative on red and positive on black), the metre will display "backwards."

Some devices may be electrically charged at all times if an outlet has reverse polarity. Electricity will flow to the switch in a properly connected outlet; with reversed polarity, it will be present in the item even when it is not switched on.Reverse polarity protection is an internal circuit that ensures the device is not destroyed if the polarity of the power source is reversed. The reverse polarity protection circuit disables power to the transmitter or transducer's sensitive electronic circuitry.If you reside in a house that has had amateur electrical work done, there's a strong chance you have some outlets with reversed polarity. That essentially means that some of your channels may surprise you. Uh oh! While not all shocks are lethal, they are all painful and unpleasant. Only a qualified electrical contractor in North Scottsdale, AZ can perform electrical repairs in your home.

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The angular velocity is infinity.

it's not possible to calculate the kinetic energy change when the angular velocity becomes infinity, it's an abstract concept.

PART 1

The angular velocity of an object is given by the formula:

ω = v/r

where

v is the linear velocity and

r is the distance from the axis of rotation.

The man's initial angular velocity is:

ω = (0.37 rev/s) * (2π rad/rev)

= 2.34 rad/s

As the man moves closer to the center, his distance from the axis of rotation decreases, so his angular velocity will increase.

To find the new angular velocity, we can use the same formula:

ω = v/r

since the radius decreases to 0, the angular velocity becomes infinity.

PART 2

The change in kinetic energy is given by the formula:

ΔK = 1/2 * I * (ω_f^2 - ω_i^2)

where

For a solid cylinder, the moment of inertia is:

I = (1/2) * m * r^2

where

The moment of inertia for the merry-go-round is:

I = (1/2) * (29 kg) * (1.2 m)^2

= 15.12 kg * m^2

The change in kinetic energy can be calculated as:

ΔK = 1/2 * (15.12 kg * m^2) * (∞^2 - (2.34 rad/s)^2)

= infinity J

Note that it's not possible to calculate the kinetic energy change when the angular velocity becomes infinity, it's an abstract concept.

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nesecitabas ayuda hace 1 hora, todavia la nesecitas?

Answer:

i got 6

Explanation:lmk if i’m wrong

Answer:

The Answer is FRICTION!

Answer:

73.152cm

Explanation:

We have been given:

          0.8yards of rain

Problem, convert to cm = ?

Solution:

The problem deals with the conversion from one length dimension to another.

 So:

           1 yard   = 91.44 cm

     So   0.8 yards  = 0.8 x 9.44 = 73.152cm

The solution to this problem is 73.152cm

Answer:

first one down second one up

Explanation:

A magnet attract a steel nail for the reason that nail is a temporary magnet whether or not it is in a magnetic field. The correct option is B.

A substance that is negatively charged at one end and positively charged at another end creating the magnetic field around it.

A nail is a magnet that can attract the particle that are charged. The nail is a temporary magnet whether or not it is in a magnetic

field.

Magnets have their own magnetic properties. They can be permanent or temporary. Magnets are made by induction or rubbing process or by cutting into small magnet pieces.

Thus, the correct option is B

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Answer:

The correct answer is:

Explanation:

the iorn in the steel becomes magnetized when the nail is in a magnetic field

A refrigerator has a coefficient of performance of 2.10. Each cycle it absorbs 3.40 x 10^4 J of heat from the cold reservoir.

The coefficient of performance (COP) is a measure of how efficient a refrigeration system is. It is defined as the ratio of the heat absorbed from the cold reservoir to the mechanical energy input. In this question, we are given the COP and the heat absorbed from the cold reservoir, and we are asked to find the mechanical energy input.
The mechanical energy required per cycle is 1.62 x 10^4 J.

To find the mechanical energy (W) required per cycle, we need to use the formula for the coefficient of performance (COP) for a refrigerator:
COP = Qc / W
where Qc is the heat absorbed from the cold reservoir and W is the mechanical work input. Given the COP is 2.10 and the heat absorbed (Qc) is 3.40 x 10^4 J, we can rearrange the formula to solve for W:
W = Qc / COP
W = (3.40 x 10^4 J) / 2.10
W ≈ 1.62 x 10^4 J
So, the mechanical energy required per cycle is approximately 1.62 x 10^4 J.

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False. The greatest number of galaxies do not belong to the type known as elliptical galaxies. In fact, the most common type of galaxy in the universe is the spiral galaxy.

Spiral galaxies are characterized by their distinctive spiral arms, which contain young stars, gas, and dust. These galaxies have a central bulge and a rotating disk. Examples of spiral galaxies include our own Milky Way galaxy and the Andromeda galaxy.

Elliptical galaxies, on the other hand, have a more rounded or elliptical shape and lack the prominent spiral arms. They are often reddish in color and have older populations of stars. Elliptical galaxies are typically found in galaxy clusters and are thought to have formed through galaxy mergers and interactions.

While elliptical galaxies are still abundant in the universe, they are not the most numerous type. Studies and observations have shown that spiral galaxies outnumber elliptical galaxies by a significant margin. This is supported by surveys and statistical analyses of large samples of galaxies in different regions of the universe.

The distribution and abundance of galaxy types can provide valuable insights into the formation and evolution of galaxies over cosmic time. Understanding the prevalence of different galaxy types helps astronomers piece together the story of how galaxies form, grow, and interact with their environments.

In conclusion, the statement that the greatest number of galaxies belong to the type known as elliptical galaxies is false. The most common type of galaxy in the universe is the spiral galaxy.

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Answer: A I just got it wrong because of the other person.

Explanation:

The electromagnetic waves are those waves that move through space and carry electromagnetic radiant energy.  They include radio waves and microwaves. and many more.  

Hence the option A is correct.

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Answer:

MOMENTUM of the football player before collision is 110×8 =880

Explanation:

The total mechanical energy of a system remains unchanged if there are no external forces acting on the system.

Mechanical energy is the sum of potential energy and kinetic energy in a system. Potential energy is associated with the position or configuration of objects, while kinetic energy is the energy of motion. The conservation of mechanical energy states that the total mechanical energy of a closed system remains constant unless acted upon by external forces.

When no external forces are present, the system is said to be isolated. In an isolated system, the total mechanical energy is conserved, meaning it does not change over time. This principle is derived from the law of conservation of energy, which states that energy cannot be created or destroyed but can only be transformed from one form to another.

In the absence of external forces, the potential energy and kinetic energy within the system can interchange without altering the total mechanical energy. For example, if a ball is thrown upward, it initially possesses kinetic energy due to its motion. As the ball rises, its kinetic energy decreases while its potential energy increases due to the increasing height. At the highest point, when the ball momentarily stops before falling back down, all its initial kinetic energy is converted into potential energy. However, the sum of potential and kinetic energy remains constant throughout the motion.

This principle of conservation of mechanical energy is fundamental in various fields of science and engineering, including mechanics, thermodynamics, and electromagnetism. It allows for the analysis and prediction of the behavior of systems without considering the specific details of external forces acting upon them.

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Answer:

58 g

Explanation:

Momentum = mass* velocity

P=mv

P= 1.06 kg*m/s

M=?

V=18 m/s

1.06 kg*m/s=m(18m/s)

M=0.058 kg

0.058kg = 58 g

Answer:

59

Explanation:

edge 2021

Marie Curie is not known for inventing the X-Ray. While she made significant contributions to the field of radiation and radioactivity, including the discovery of radium and polonium.

Her pioneering research in the study of radioactivity, the invention of the X-Ray was not one of her accomplishments. The X-Ray was discovered by Wilhelm Conrad Roentgen in 1895, while Marie Curie's groundbreaking work focused primarily on the study of radioactive elements. While she made significant contributions to the field of radioactivity, including the discovery of radium, and she utilized X-rays in her research, the invention of X-rays is credited to Wilhelm Conrad Roentgen. Marie Curie's groundbreaking achievements primarily revolve around her research on radioactivity and her discoveries of radium and polonium. Additionally, she became the first female professor at the University of Paris, making significant strides for women in academia

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To increase the efficiency of the Carnot engine by 10% of the original efficiency, the temperature of the heat source should be increased by 0.067 times its original value

The efficiency of a Carnot engine is given by:

Efficiency = 1 - (Tc/Th)

Where

In this case, the efficiency of the engine is 40%, which can be expressed as 0.4 in decimal form. Therefore:

0.4 = 1 - (Tc/Th)

Rearranging this equation, we get:

Tc/Th = 0.6

We want to increase the efficiency by 10% of the original efficiency. This means that the new efficiency will be :

0.4 + 0.1(0.4) = 0.44

We can use this new efficiency to find the new ratio of Tc/Th:

0.44 = 1 - (Tc_new/Th_new)

Tc_new/Th_new = 0.56

Now we need to find by how many degrees the temperature of the heat source should change to achieve this new ratio of temperatures. We can set up an equation using the two ratios of temperatures:

(Tc/Th) / (Tc_new/Th_new) = 0.6 / 0.56

Substituting the first ratio we found earlier and simplifying, we get:

0.6 / (Th_new/Th) = 0.6 / 0.56

Th_new/Th = 0.56/0.6

Th_new/Th = 0.933

Multiplying both sides by Th, we get:

Th_new = 0.933 Th

So the temperature of the heat source should be increased by:

ΔT = Th_new - Th = 0.933 Th - Th = 0.067 Th

Where ΔT is the change in temperature and Th is the original temperature of the heat source.

Therefore, to increase the efficiency of the Carnot engine by 10% of the original efficiency, the temperature of the heat source should be increased by 0.067 times its original value.

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The time taken for the coffee to cool from 93°C to 73°C is approximately 36.1 minutes.

The cooling law is given by:

$$\frac{dQ}{dt}=-k(T-T_0)$$

where Q is the heat in the object, t is the time taken, T is the temperature of the object at time t, T0 is the temperature of the environment and k is a constant known as the cooling constant.

We need to find the time it takes for the coffee to reach a drinking temperature of 73°C given that its initial temperature is 93°C.

Therefore, we need to find the time it takes for the coffee to cool down from 93°C to 73°C when placed in a room temperature of 18°C.

Let’s assume that the heat energy that is lost by the coffee is equal to the heat energy gained by the environment. We can express this as:

dQ = - dQ where dQ is the heat energy gained by the environment.

We can substitute dQ with C(T-T0) where C is the specific heat capacity of the object.

We can rearrange the equation as follows:

$$-\frac{dQ}{dt}=k(T-T_0)$$

$$-\frac{d}{dt}C(T-T_0)=k(T-T_0)$$

$$\frac{d}{dt}T=-k(T-T_0)$$

The differential equation above can be solved using separation of variables as follows:

$$\frac{d}{dt}\ln(T-T_0)=-k$$

$$\ln(T-T_0)=-kt+c_1$$

$$T-T_0=e^{-kt+c_1}$$

$$T=T_0+Ce^{-kt}$$

where C = e^(c1).

We can now use the values given to find the specific value of C which is the temperature difference when t=0, that is, the temperature difference between the initial temperature of the coffee and the room temperature.

$$T=T_0+Ce^{-kt}$$

$$73=18+C\cdot e^{-0.09t}$$

$$55=C\cdot e^{-0.09t}$$

$$C=55e^{0.09t}$$

$$T=18+55e^{0.09t}$$

We can now solve for the value of t when T=93 as follows:

$$93=18+55e^{0.09t}$$

$$e^{0.09t}=\frac{93-18}{55}$$

$$e^{0.09t}=1.3636$$

$$t=\frac{\ln(1.3636)}{0.09}$$

Using a calculator, we can find that the time taken for the coffee to cool from 93°C to 73°C is approximately 36.1 minutes.

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The circumstance in which the force exerted on an apple by your hand happens when the apple is at rest in your open hand. Correct option is C.

There is a force exerted on your hand by the apple when the apple is in contact with your hand and you are holding it up against the force of gravity.

When you hold an apple in your hand, the apple is pressing against your hand with a force equal and opposite to the force your hand is applying on the apple. This force is due to the interaction between the atoms and molecules of your hand and the apple, which is known as the normal force.

As long as the apple remains in contact with your hand, there is a normal force acting on the apple and your hand, which prevents the apple from falling due to the force of gravity. Therefore, the force exerted on your hand by the apple is present when the apple is in contact with your hand and you are holding it up against the force of gravity. And the correct option is C.

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To determine the specific heat capacity of a metal by heating it in a water bath, pouring the hot metal into cool water, and measuring the change in temperature, two assumptions made in measuring the initial temperature of the metal are:

1. The metal has a uniform initial temperature throughout its entire volume, meaning that there are no temperature variations within the metal sample.

2. The heat transfer between the metal and its surroundings, such as the water bath or any other objects in contact with the metal, is negligible during the time it takes to measure the initial temperature.

This assumption ensures that the initial temperature measurement accurately represents the metal's temperature at the start of the experiment.

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Answer:

To solve this problem, we need to use the conservation of energy principle. At the top of its flight, the stone has zero kinetic energy and only potential energy due to its position above the ground. Therefore, we can calculate the potential energy and then use the conservation of energy to find the kinetic energy at the top of its flight. The gravitational potential energy of an object is given by the formula: PE = mgh where m is the mass of the object, g is the acceleration due to gravity, and h is the height of the object above the ground. The stone is thrown at an angle of 32 degrees above the horizontal, so its maximum height can be found using the formula: h = (v^2 * sin^2θ) / (2g) where v is the initial velocity, θ is the angle of projection, and g is the acceleration due to gravity

Answer:

P = 96 J

Explanation:

Given that,

Weight of the book, W = mg = 8 N

It is placed at a height of 12 m

We need to find the potential energy of the book. The potential energy of an object is given by the formula as follows :

E = mgh

mg = Weight

\(E=8\ N\times 12\ m\\E=96\ J\)

So, the potential energy of the book is 96 J.

The four interactions of electromagnetism are:

1. Electric Field Interaction: The electric field is created by electric charges and exerts a force on other charged particles.

2. Magnetic Field Interaction: The magnetic field is generated by moving electric charges or currents and exerts a force on other moving charges or magnetic materials.

3. Electromagnetic Induction: Electromagnetic induction occurs when a changing magnetic field induces an electric current in a conductor.

4. Electromagnetic Waves: Electromagnetic waves are a form of energy propagation that results from oscillating electric and magnetic fields.

The theory of electromagnetism describes the fundamental interactions of electromagnetism, which are based on the principles of electricity and magnetism. These interactions are explained by Maxwell's equations and the electromagnetic field theory. The four interactions of electromagnetism are:

1. Electric Field Interaction: The electric field is created by electric charges and exerts a force on other charged particles. According to Coulomb's law, like charges repel each other, while opposite charges attract. Electric field interactions play a crucial role in understanding the behavior of charged particles and electrically charged objects.

2. Magnetic Field Interaction: The magnetic field is generated by moving electric charges or currents and exerts a force on other moving charges or magnetic materials. According to the laws of magnetism, like poles repel each other, while opposite poles attract. Magnetic field interactions are responsible for various phenomena, including the behavior of magnets, electromagnetic induction, and the operation of electric motors and generators.

3. Electromagnetic Induction: Electromagnetic induction occurs when a changing magnetic field induces an electric current in a conductor. This phenomenon is described by Faraday's law of electromagnetic induction and is the basis for generating electricity in power plants and the operation of transformers.

4. Electromagnetic Waves: Electromagnetic waves are a form of energy propagation that results from oscillating electric and magnetic fields. These waves include radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays. Electromagnetic waves can travel through a vacuum and have various applications, including communication, imaging, and energy transmission.

These four interactions of electromagnetism are interconnected and form the foundation of numerous technological advancements and our understanding of the natural world. They have been extensively studied and tested, leading to the development of theories and applications in various fields such as electronics, telecommunications, energy, and medical imaging.

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Explanation:

the object with less density will stay on top, the other at the bottom.

seawater has the higher density than the tennis ball (1030 kg/m³ vs. 970 kg/m³), so the ball will float.

olive oil has less density than the tennis ball (900 kg/m³ vs. 970 kg/m³), so the ball will sink to the ground.

The force F1 is equal and opposite to the downward force thus, F1 is equal to 60 N. The force F2 is inclined to 30 ° from leftward force and it is equal to 38.97 N in magnitude.

Force is an external agent acting on a body to deform it or to change its state of motion or rest. Force is a vector quantity and it is characterised by its magnitude and direction.

If two forces acting on a body from the same directions, then the net force will be the sum of these two forces. If they are acting from opposite directions, they will cancel each other in magnitude.

The force F1 is equal and opposite to the force acting downward. Thus its magnitude is 60 N. The force F2 is inclined to 30 ° from horizontal direction.

F2 = 45 cos 30 = 38.9 N.

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Answer:

Because fluid pressure increases with depth, there is more fluid pressure___outside__ of a submerged object than on the _inside___

Explanation:

As the object is submerged means that it is under water and not on the surface. It tells that water pressure exerting on the object from the outside is higher than inside which is why the object is submerged.

In the other case, the object will not remain submerged if its internal pressure is high, it will float on water.