explain why as in the case of a falling hammer we may ignore the effects of air resistance and treat it as if it were in free fall​

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.

18.4 seconds is the time required for the object to travel 4550 meters.

From the second equation of motion;

s = ut + (1/2 × a × t² )

Where u is initial velocity, a is acceleration and t is time elapsed and s is distance covered.

Given the data in the question;

To determine the time needed, plug the given values into the equation of motion above.

s = ut + (1/2 × a × t² )

4550m = 0(t) + (1/2 × 27m/s² × t² )

4550m = 1/2 × 27m/s² × t²

4550m = 13.5m/s² × t²

t² = 4550m/13.5 s²

t = √(  4550m/13.5 s² )

t = 18.4s

Therefore, the required time is 18.4 seconds.

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The average force required to bring the car to a stop at 130m is 0N.

To solve the first part of the problem, we can use the conservation of energy principle. At the beginning, the roller coaster has potential energy, which is converted to kinetic energy as it moves down the track. At the top of the second hill, the roller coaster has a certain amount of potential energy and kinetic energy.

Let's first calculate the speed of the roller coaster at the bottom of the first hill using conservation of energy:

mgh = (1/2)mv^2

where m is the mass of the roller coaster, g is the acceleration due to gravity, h is the initial height, and v is the speed at the bottom of the first hill.

Plugging in the values, we get:

890 kg * 9.81 m/s^2 * 97 m = (1/2) * 890 kg * v^2

Solving for v, we get:

v = 43.26 m/s

Now, let's find the speed of the roller coaster at the top of the second hill using conservation of energy again:

(1/2)mv1^2 + mgh1 = (1/2)mv2^2 + mgh2

where v1 is the velocity at the bottom of the first hill, h1 is the height at the bottom of the first hill, h2 is the height at the top of the second hill, and v2 is the velocity at the top of the second hill.

Plugging in the values, we get:

(1/2) * 890 kg * (43.26 m/s)^2 + 890 kg * 9.81 m/s^2 * 62 m = (1/2) * 890 kg * v2^2 + 890 kg * 9.81 m/s^2 * 62 m

Solving for v2, we get:

v2 = 30.3 m/s

Therefore, the velocity of the roller coaster at the top of the second hill is 30.3 m/s.

For the second part of the problem, we can use the work-energy principle. The work done by the frictional force is equal to the change in kinetic energy of the roller coaster.

Let F be the average force required to bring the roller coaster to a stop at a distance of 130 m. The work done by this force is:

W = Fd = (1/2)mvf^2

where d is the distance over which the roller coaster comes to a stop, and vf is the final velocity, which is zero.

Plugging in the values, we get:

F * 130 m = (1/2) * 890 kg * (0 m/s)^2

Solving for F, we get:

F = 0 N

Therefore, this means that no force is required to bring the roller coaster to a stop at 130 m, since there is no friction. If there were friction, the average force required would depend on the coefficient of friction and the initial velocity of the roller coaster.

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Answer:

Explanation:

Given:

m = 0.005 g = 5·10⁻⁶ kg

R = 3 m

__________

J - ?

J = m·R² = 5·10⁻⁶·3² ≈ 45·10⁻⁶ kg·m²

Answer:

The snapshot of idleness of given point mass still up in the air by,

Where,

- snapshot of idleness

- mass = 0.005 g = ( 0.005/1000 ) = 5 × 10⁻⁶ kg

- opposite distance = 3 m

Put the qualities in the equation,

Hence; the snapshot of idleness of given point mass is 4.5 × 10⁻⁵ kgm².

To find out about snapshot of idleness,

Explanation:

Snapshots of dormancy can be found by adding or coordinating over each 'piece of mass' that makes up an article, increased by the square of the distance of each 'piece of mass' to the hub. In vital structure the snapshot of latency is I=∫r2dm I = ∫ r 2 d m .

For a planar item, the snapshot of idleness about a hub opposite to the plane is the amount of the snapshots of dormancy of two opposite tomahawks through a similar point in the plane of the article. The utility of this hypothesis goes past that of computing snapshots of rigorously planar items.

Picture result for track down the snapshot of idleness of a mark of mass of 0.005g at an opposite distance of 3m from its hub of revolution.

What is snapshot of inactivity of an empty circle about a hub going through its middle ? Arrangement : 'I = (2)/(3) MR^(2)', where 'M' is the mass and 'R' is sweep of the empty circle.

Answer:

D is the answer

Explanation:

But do u know if im right test it out then surprise

The electromagnetic waves described in the reading are different in two ways, and that is Frequency and velocity. Hence, option D is correct.

A magnetic field and an electric field vibrate together to produce electromagnetic waves, often known as EM waves. In other terms, magnetic and electric fields that are oscillating make up electromagnetic waves (EM).

When a magnetic field and an electric field interact, electromagnetic waves are created. The term "electromagnetic waves" is used to describe them. An electromagnetic wave has an electric field and a magnetic field that are perpendicular to one another. They are likewise perpendicular to the EM wave's direction.

The wavelength and frequency of electromagnetic waves vary. Electromagnetic waves with longer wavelengths have lower frequencies, whereas those with shorter wavelengths have higher frequencies. Waves at higher frequencies carry more power. A wave's wavelength and frequency together determine its speed.

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According to the question the pressure is held constant 40°C.

Pressure is a physical quantity that describes the internal forces exerted on an object by its environment. It is defined as the force per unit area on a surface, and is measured in units of pascals (Pa). Pressure is an expression of the amount of work done by a force applied over a given area, and is a major factor in the dynamics of fluid flow. Pressure is a scalar quantity, meaning it has magnitude but no direction.

The volume of an ideal gas is directly proportional to its temperature when the pressure is held constant. To calculate the new temperature, use the equation:

T2 = T1 (V2/V1), where T1 is the initial temperature, V1 is the initial volume, T2 is the new temperature, and V2 is the new volume.

In this case, T1 = 20°C, V1 = 6.00 × 102 cm3, V2 = 1.20 × 103 cm₃.

Therefore, T2 = 20°C (1.20 × 103 cm3/6.00 × 102 cm3) = 40°C.

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The magnitude of the electric field due to the dipole at location A, a distance r=10 cm away from the center of the dipole, is 2.25 x 10^5 N/C.

The direction of the electric field is in the same direction as the dipole moment vector.

The electric field due to an electric dipole can be calculated using the following formula:

E = kp/r^3

where:

E is the magnitude of the electric field

k is Coulomb's constant, which is equal to 1/(4πε0)

p is the dipole moment

r is the distance from the center of the dipole to the point where the electric field is being calculated

In this case, we are given the following values:

q = 3 nC

s = 1 mm = 1 x 10^-3 m

r = 10 cm = 0.1 m

The dipole moment is calculated as follows:

p = qs

p = 3 nC x 1 x 10^-3 m

p = 3 x 10^-9 Cm

Now that we know the value of the dipole moment, we can calculate the magnitude of the electric field:

E = kp/r^3

E = (1/(4πε0)) x (3 x 10^-9 Cm) / (0.1 m)^3

E = 2.25 x 10^5 N/C

The direction of the electric field is in the same direction as the dipole moment vector. In this case, the dipole moment vector is pointing to the right, so the electric field is also pointing to the right.

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Answer:

11m/s²

Explanation:

Given parameters:

Mass of object  = 10g  = 0.01kg

Radius  = 5cm  = 0.05m

V = 0.75m/s

Unknown:

Centripetal acceleration  = ?

Solution:

Centripetal acceleration is the acceleration of a body in circular path. It can be derived using;

     a  = \(\frac{v^{2} }{r}\)  

v is the velocity

r is the radius

Now, insert the parameters;

         a  = \(\frac{0.75^{2} }{0.05}\)   = 11.25m/s²

Based on the nature of variables, none of the evidence card should be eliminated because they all represent variables.

Variables refers to any quantity that can have various values.

Variables include age, time , distance, height, speed, etc.

Variables can either be independent, dependent or constant.

There, none of the evidence card should be eliminated because they all represent variables.

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When an individual enters a hypoxic breathing chamber, the changes that would occur would be an increase in the blood pH.

A hypoxic breathing chamber is a type of chamber that is built with the ability to cause an artificial high-altitude conditions.

There are various changes that would occur in the body when placed in a hypoxic state. These changes include the following:

Therefore, when an individual enters a hypoxic breathing chamber, the changes that would occur would be an increase in the blood pH.

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The magnitude of the external magnetic field is approximately 0.194 Tesla.

To solve this problem, we can use the equation for the magnetic force on a current-carrying wire:

F = BILsinθ

where F is the magnetic force, B is the magnitude of the magnetic field, I is the current, L is the length of the wire, and θ is the angle between the wire and the magnetic field.

Given:

Length of the wire, L = 0.19 m

Current, I = 7.6 A

Angle, θ = 17°

Force, F = 6.2 x \(10^{-3}\)N

Substituting the given values into the equation, we have:

6.2 x \(10^{-3}\) N = B * 0.19 m * 7.6 A * sin(17°)

Simplifying the equation, we can solve for B:

B = (6.2 x \(10^{-3}\) N) / (0.19 m * 7.6 A * sin(17°))

Calculating this expression, we find:

B ≈ 0.194 T

Therefore, the magnitude of the external magnetic field is approximately 0.194 Tesla.

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When the block and table are in an elevator moving upward at a constant speed, the magnitude of the normal force (Fn) is equal to the weight (mg) of the block.

This is because there is no net force acting in the vertical direction, so Fn balances out the weight of the block.

If the elevator is moving upward at an increasing speed, the magnitude of the normal force (Fn) will be greater than the weight (mg) of the block. The additional upward acceleration of the elevator requires an additional upward force to accelerate the block. The normal force must be greater than mg to provide this extra force and maintain equilibrium.

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The momentum of the brick just before it hits the ground, given that it has a mass of 1.5 Kg is 13.083 Kg.m/s

We'll begin by obtaining the velocity of the brick just before hitting the ground. Details below:

v = u + gt

v = 0 + (9.8 × 0.89)

v = 0 + 8.722

v = 8.722 m/s

Finally, we shall determine the momentum of the brick. Details below:

Momentum = mass × velocity

Momentum of brick = 1.5 × 8.722

Momentum of brick = 13.083 Kg.m/s

This, the momentum of the brick is 13.083 Kg.m/s

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Answer:

here you go hope it helped

Explanation:

Answer:

The spring balance (also known as spring scale) is simply a spring fixed at one end with a hook to attach an object at the other. It works by Hooke's Law, which states that the force needed to extend a spring is proportional to the distance that spring is extended from its rest position.

HOW IT WORKS:

It consists of a spring fixed at one end with a hook to attach an object at the other. It works by Hooke's Law, which states that the force needed to extend a spring is proportional to the distance that spring is extended from its rest position. Therefore, the scale markings on the spring balance are equally spaced.

Electrical equipment should be unplugged and removed from service if it is suspected of being faulty or damaged in any way, poses a potential safety hazard, or has been subjected to extreme conditions such as exposure to water or overheating.

It is also important to regularly inspect and maintain content loaded electrical equipment to ensure it is functioning properly and prevent any potential risks. If electrical equipment is suspected of being defective or damaged in any manner, poses a risk to public safety, or has experienced severe circumstances like water exposure or overheating, it should be disconnected and taken out of operation. In order to make sure that it is operating safely and avoiding any possible threats, it is also crucial to routinely examine and repair electrical equipment that is loaded with material.

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To keep the fridge cold for 9.5 hours, you should buy approximately 0.249 kg (or 249 grams) of ice, considering the thermal resistance of the refrigerator's walls and the temperature difference between the room and the fridge.

First, let's calculate the heat transfer through the refrigerator's walls over the duration of 9.5 hours. We can use the formula:

Q = ΔT / R

where Q is the heat transfer, ΔT is the temperature difference, and R is the thermal resistance.

Given that the room temperature is 20 °C and the fridge temperature is 0 °C, the temperature difference is ΔT = 20 °C - 0 °C

= 20 °C.

Plugging in the values, we get:

Q = 20 °C / (0.24 K/W)

= 83.33 W

The heat transfer represents the amount of heat that needs to be absorbed by the ice to keep the fridge cold.

Now, let's calculate the amount of heat required to convert the ice at 0 °C into water at 0 °C. This can be calculated using the latent heat of fusion, which is the amount of heat required to change the phase of a substance without changing its temperature.

The latent heat of fusion for water is 334 kJ/kg.

To convert it to joules, we multiply by 1000:

Latent heat of fusion = 334 kJ/kg

= 334,000 J/kg

Since the ice is at 0 °C and needs to be converted into water at 0 °C, there is no change in temperature. Therefore, the heat required is equal to the latent heat of fusion.

Now, let's calculate the mass of ice needed. We can use the formula:

Q = m * Latent heat of fusion

Rearranging the formula, we get:

m = Q / Latent heat of fusion

Substituting the values, we have:

m = 83.33 W / 334,000 J/kg

Calculating the result:

m ≈ 0.249 kg

Therefore, you should buy approximately 0.249 kg (or 249 grams) of ice to keep the fridge cold for 9.5 hours.

To keep the fridge cold for 9.5 hours, you should buy approximately 0.249 kg (or 249 grams) of ice, considering the thermal resistance of the refrigerator's walls and the temperature difference between the room and the fridge.

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Interference occurs when two or more waves meet and interact with each other. These interactions can be constructive or destructive, depending on how the waves are aligned with each other.

Constructive interference occurs when waves are aligned in phase with each other, resulting in an increase in amplitude, while destructive interference occurs when waves are aligned out of phase, resulting in a decrease in amplitude. Of the group of answer choices given, the situation that would result in interference is when a wave bounces off an object and interferes with another wave in the same space.

When the wave is reflected off an object, it produces a new wave that interacts with the original wave, resulting in interference. This can lead to constructive interference if the waves are aligned in phase, or destructive interference if they are aligned out of phase.

Interference occurs when two waves meet and interact with each other. These interactions can be either constructive or destructive, depending on the alignment of the waves with each other. When waves are aligned in phase, constructive interference occurs, resulting in an increase in amplitude. On the other hand, when waves are aligned out of phase, destructive interference occurs, resulting in a decrease in amplitude.

The situation that would result in interference is when a wave bounces off an object and interferes with another wave in the same space. This can lead to either constructive or destructive interference, depending on how the waves are aligned.

Therefore, the answer is wave bouncing off an object.

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Answer:

A scientific model is a physical and/or mathematical and/or conceptual representation of a system of ideas, events or processes. Scientists seek to identify and understand patterns in our world by drawing on their scientific knowledge to offer explanations that enable the patterns to be predicted.

Answer:

D

Explanation:

Answer: INCREASE THE IMPACT TIME

crumple zones help transfer some of the cars kinetic energy into controlled deformation, or crumpling, at impact

Answer:

C. somatosensory

Explanation:

The somatosensory cortex is located in the front area of the parietal lobe. It receives signals for various areas of the body registering sensory input.

The primary somatosensory cortex specializes in receiving signals from different parts of the body.

The somatosensory is subsystem of nervous system that represents visual stimulus.  

The somatosensory system is the network of neural structures in the brain and body that helps us to detect touch, temperature, and pain.

Thus, the primary somatosensory cortex specializes in receiving signals from different parts of the body.

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Farming or agriculture by humans had great impact on the population in certain areas. Farming created a facile environment for people get into a developing life and the areas feasible for cultivation were populated more.

Human populations have frequently rebuilt their subsistence niches, altering both their food sources and living environments. For instance, most human populations changed from foraging to engaging in various forms of agriculture over the past 12,000 years.

It is well known that the transition to agriculture had an impact on a number of areas of human biology and demography, including mortality risk, population growth, adult body size, and physical indicators of health.

The reasons why populations tended to grow in size at times when indices of health declined are poorly understood since these tendencies have not been included in a comprehensive conceptual framework. All these are significant changes after the generation of an agricultural society.

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Answer:

average speed is 60km/h

Explanation:

you sum up the speed attained in each distance covered and divide it by 2 to get your answer

There is a total charge of +3Q spread uniformly throughout the volume of the insulating shell, not just on the surface. The inductance needed to keep the maximum current is 5.58 H.

To determine the required inductance to keep the maximum current in the circuit below 85.0 mA, we can use the formula that relates inductance, frequency, and maximum current in an inductor:

L = \(V_{max\) / (ω * \(I_{max\)),

where L is the inductance, \(V_{max\) is the maximum voltage, ω is the angular frequency, and \(I_{max\) is the maximum current.

Given:

f = 20.0 Hz (frequency)

\(V_{rms\) = 60.0 V (root mean square voltage)

\(I_{max\)= 85.0 mA (maximum current)

To find ω, we can use the relationship:

ω = 2πf,

ω = 2π * 20.0 Hz,

ω ≈ 125.66 rad/s.

Now we can substitute the given values into the inductance formula:

L = \(V_{max\)/ (ω * \(I_{max\)),

L = 60.0 V / (125.66 rad/s * 85.0 * 10^-3 A),

L ≈ 5.58 H.

Therefore, the inductance needed to keep the maximum current in the circuit below 85.0 mA is approximately 5.58 H.

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Answer:

The net force on the box is 2N and it will make the box to move in a leftward direction

Explanation:

We should understand first of all that forces are vectors. This means that they have both magnitude and direction.

The next thing we will need to do is to set a coordinate system. Let the leftward forces be negative while the rightward forces are positive.

That means that the equivalent forces on the box will be -5N + 3N = - 2N

Hence, the net force on the box is 2N and it will make the box to move in a leftward direction

The fact that the universe is expanding means that space itself is growing larger. The expansion of the universe refers to the observation regarding celestial bodies like galaxies, clusters of galaxies, etc.

The expansion of universe refers to the observation that galaxies, clusters of galaxies, and other cosmic structures are moving away from each other over time. This phenomenon was first discovered through the observation of redshift, where light from distant galaxies is shifted towards longer wavelengths, indicating their motion away from us.

When we say that the universe is expanding, it means that the distances between objects in space are increasing with time. However, it is important to note that it is not just the objects within the universe that are moving away from each other, but rather the fabric of space itself is stretching or expanding.

One way to visualize this is to imagine the universe as a grid on a rubber sheet. As the rubber sheet stretches, all the points on the grid move away from each other. Similarly, as space expands, galaxies and other structures move apart from each other.

It's worth mentioning that the expansion of the universe does not mean that galaxies are moving through space like objects on the surface of an inflating balloon. Instead, it is the expansion of space itself that causes the apparent motion of galaxies away from each other.

This concept of the expanding universe is a fundamental aspect of modern cosmology and is supported by a wealth of observational evidence, including the cosmic microwave background radiation and the distribution of galaxies.

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In a capacitive circuit, the voltage lags behind the current and the voltage would point downward.

A capacitive circuit is a circuit that has a capacitor in it. We know that sometimes the voltage and the current may not be in phase. This implies that they are out of step with each other.

In a capacitive circuit, the current is out of step with the voltage and they are out of step by a factor 1/4 of a cycle or by 90 degree or we can say that it is a factor of about π/2 radians.

Thus, the capacitive circuit is one that involves an out of phase relationship between the voltage and the current and the current is lagged by the voltage.

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The correct answer is (b) Flash your headlights quickly a couple of times.

If an approaching vehicle fails to dim their headlights, it can cause discomfort and temporary blindness to the driver of the oncoming vehicle. To signal the other driver to dim their lights, you should flash your headlights quickly a couple of times. This is a common signal for drivers to indicate that their headlights are too bright and causing discomfort.

However, it's important to not continuously flash your headlights, as this can be distracting and dangerous. Additionally, it's important to keep your own headlights on and not turn them off, as this can impair your own visibility and increase the risk of an accident.

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The correct answer is b) Flash your headlights quickly a couple of times.

What is Headlight?

A headlight is a component of a vehicle's lighting system that is located at the front of the vehicle and is used to provide illumination for the driver while driving at night or in low-visibility conditions. It typically consists of a bulb or LED, reflector, lens, and housing. The headlight is typically controlled by a switch on the dashboard of the vehicle.

If an approaching vehicle fails to dim their headlights, you should flash your headlights quickly a couple of times to signal the other driver to dim their headlights.

This will help prevent the other driver's bright headlights from blinding you and causing a potential safety hazard on the road.

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Reactions that are Exothermic and Endothermic These emit energy in the form of heat, cold, light, sound, or vibration.

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