Explain what it means when we say a substance is magnetic.

The centripetal force in uniform circular motion remains constant as long as the object's mass and velocity don't change, since centripetal force is calculated as the mass times centripetal acceleration (Fc = mac).

In uniform circular motion, the centripetal force must remain constant to maintain the motion. The second law of motion given by Newton states that net force is mass times acceleration: net F = ma. We have centripetal acceleration (a = ac) for uniform circular motion, and consequently, Fc, the magnitude of centripetal force is Fc = mac. This equation implies that as long as the mass of the object and its velocity (which together determine ac) remain constant, the centripetal force will also remain constant. It is this force that maintains the object in a circular path, acting towards the center of curvature and altering the direction of the object without changing its speed.

It's important to note that centripetal force is not a particular type of force; rather, it could be provided by any force or combination of forces that act towards the center of the object's circular path, like gravitational force, tension, friction, or any other appropriate force that can cause the required centripetal acceleration for uniform circular motion.

Using  the scientific definition of work, a greater amount of force does not always result in a greater amount of work because work done is the result of the force applied and the displacement of that object.

The work done on an object when the object shows the displacement with respect to the force applied to it and If the force is applied in the same direction as the displacement, work is done on the object, and the work done is equal to the force multiplied by the displacement. The greater force does not show the greater amount of work, as the work done has different factors that it depends upon.

Hence, using the scientific definition of work, a greater amount of force does not always result in a greater amount of work because work done is the result of the force applied and the displacement of that object.

Learn more about the work done here.

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Answer:

a = - 6 m/s/s

here negative sign shows that velocity is decreasing with time

Explanation:

As we know that average acceleration is given by

[tex]a_{avg} = \frac{v_f - v_i}{\Delta t}[/tex]

here we will have

[tex]v_f[/tex] = final speed = 0 m/s

[tex]v_i[/tex] = initial speed = 9 m/s

[tex]\Delta t[/tex] = time interval = 1.50 s

now from above equation we will have

[tex]a = \frac{0 - 9}{1.5}[/tex]

[tex]a = - 6 m/s^2[/tex]

so average acceleration will be -6 m/s/s

Pluto is not a planet because it's a dwarf planet it's to small to be a planet.

Hopefully this helped =)!

Acceleration is the rate at which velocity changes when direction is involved, and the rate at which speed changes when there is no directional change.

When motion is changing directions, acceleration is the rate at which velocity changes, but when motion is not changing direction, acceleration may be expressed as the rate at which speed changes.

Acceleration is defined as the time rate of change of velocity, which includes both the magnitude and direction of the velocity vector. Therefore, when an object changes its direction, even if maintaining a constant speed, it is still undergoing acceleration because its velocity vector is changing. However, when the direction is constant and only the speed changes, acceleration refers to the rate of this change in speed.

Final answer:

To convert the energy usage of a refrigerator from kWh to J, kJ, and Cal, we multiply by appropriate conversion factors. The refrigerator uses 2.556 × 10^9 J, 2.556 × 10^6 kJ, and approximately 610,868 Cal per year. At an electricity cost of $0.15 per kWh, it costs $106.50 per year to run.

Explanation:

To answer the question on how to convert the annual energy usage of a frost-free refrigerator from kilowatt-hours (kWh) to Joules (J), kilojoules (kJ), and Calories (Cal), we can use the following conversion factors:

1 kWh = 3.6 × 10^6 J (Joules)

1 J = 0.001 kJ (kilojoules)

1 Cal = 4.184 kJ (the food Calorie, with a capital 'C', is equivalent to a kilocalorie)

Now, we will convert the 710 kWh/year:

To Joules: 710 kWh × 3.6 × 10^6 J/kWh = 2.556 × 10^9 J

To kilojoules: 2.556 × 10^9 J × 1 kJ/1000 J = 2.556 × 10^6 kJ

To Calories: Using the relationship between kJ and Cal: 2.556 × 10^6 kJ / (4.184 kJ/Cal) ≈ 610,868 Cal

The cost to run such a refrigerator at a typical electricity cost of $0.15 per kWh can be calculated as follows:

Annual Cost = 710 kWh/year × $0.15/kWh = $106.50/year

Answer:

The correct answer is: It acts perpendicular to the velocity and is directed toward the center of the circle.

Explanation:

The Centripetal Force is when an object that describes a circular path has the feeling that it is carried inside the center of the circumference described. This indicates that the centripetal force acts with attraction on the body, indicating the directions that it must take.

In other words, the centripetal force is the force that acts on a moving object on a curvilinear path, and that is directed towards the center of path curvature.

When the object moves in a curvilinear direction, the centripetal force will always act perpendicular to the known direction, that is, it always acts perpendicular to the direction of movement of the body on which it is applied.

Given all this, it is possible to say that the correct answer is: It acts perpendicular to the velocity and is directed toward the center of the circle.

The vertical displacement D(t) between two jumping basketball players can be found using the kinematic equation for vertical motion. By accounting for the later jump time of the second player, we can subtract their height functions to find the displacement as a function of time in terms of initial height H, gravitational acceleration g, and time t.

The student's question involves calculating the vertical displacement of two basketball players, Arabella and Boris, during their jumps, with Arabella starting her jump before Boris. To find the vertical displacement D(t) as a function of time, we need to consider the kinematic equation for vertical motion H(t) = V0t - (1/2)gt2, where V0 is the initial vertical velocity, g is the acceleration due to gravity (9.8 m/s2), and t is the time.

Assuming both players have the same V0 and are affected by the same g, the displacement of each player at any time t is given by:

Given that Boris starts jumping at time tr later than Arabella, his height function H(b) has t - tr. The vertical displacement D(t) between Arabella and Boris from 0 < t < tr can be found by subtracting the height of Boris from the height of Arabella:

D(t) = H(a)(t) - H(b)(t)

Substituting in the expressions for H(a)(t) and H(b)(t) gives us the final expression for D(t) in terms of the known quantities H, g, and t.

a will be the initial amount so:

a = 1,500 kg/m³

b will be decrease factor so:

1 - 3%

b = 0.97

Answer : Wavelength.

Explanation :

A disturbance created in a medium produces wave.

In transverse wave, the particles of the medium moves in the direction perpendicular to the direction of propagation of wave.

The uppermost portion of the wave is called the crest and the lower most portion is called the trough.

In longitudinal wave, the particles of medium moves in the same direction of wave i.e. in the direction parallel to the wave.

The particles of medium in longitudinal wave forms compressions and rarefactions. In compression the density of particles in more in a particular space while in rarefaction it is less.

Hence, the wavelength is the the distance between two crests or two troughs on a transverse wave.

It is also the distance between compressions or the distance between rarefactions on a longitudinal wave.

Non-visible radiation is used in medical imaging, such as X-rays and ultrasound, in sterilization and disinfection with UV light, and in commercial applications like detecting metal flaws and preserving food.

Example of Non-Visible Radiation Used in Medical Imaging:

Medical imaging is a major application of non-visible radiation that does not rely on radioisotopes. An example of this is the use of X-ray imaging to view the internal structure of the body, which utilizes X-rays, a form of electromagnetic radiation outside the visible spectrum, to create images of bones and organs. Ultrasound, another non-visible form of radiation, uses high-frequency sound waves to produce images of soft tissues, such as inside a pregnant woman's womb to monitor the developing fetus.

Non-Visible Radiation in Sterilization and Disinfection:

Another use of non-visible radiation is in the field of sterilization and disinfection. Ultraviolet (UV) light is effective at killing microorganisms by causing damage to their DNA. This type of nonionizing radiation is less energetic than ionizing radiation and can be used to sterilize surgical instruments and disinfect water without penetrating the material of the packaging or damaging the cells of human tissue.

Non-Visible Radiation for Pest Control and Food Preservation:

Non-visible radiation is also used commercially, such as using gamma rays from cobalt-60 to detect flaws in metals and to sterilize male flies for pest control. In food preservation, non-visible radiation is applied to kill microorganisms that can spoil food, thus extending its shelf life and reducing the risk of foodborne illnesses without the use of chemical preservatives.

Answer: C.

The gravitational pull of Earth is greater than that of the Moon.

Explanation: plato :3

Answer: B on edg

Explanation:

Answer:

temperature probe

Explanation:

When gases, liquids, or solids are in contact with a moving object, the flow of _____ occurs due to frictional forces.

The answer is HEAT

This is becuase when objects flow against friction energy is rubbed with friction causing surfaces to heat from the molecules rubbing.

The value of ΔH for this process is 1.519 kJ.

To calculate the value of ΔH for a process, we need to consider the heat absorbed or released and the work done on or by the system.

In this case, the gas absorbs 829J of heat from its surroundings and has 0.69kJ of P−V work done on it by its surroundings.

The ΔH for this process can be calculated as ΔH = q + w, where q represents the heat absorbed or released and w represents the work done on or by the system. Therefore, ΔH = 0.829 kJ + 0.69 kJ = 1.519 kJ.

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Answer:

The sum of all outputs must equal the input.

Explanation: