A train begins a journey from a station and travels 60 km in a time of 20 minutes. What is the average speed of the train?
A 3.0 m/s B 5.0 m/s 50 m/s 60 m/s​

The magnetic force on the proton will be zero.

When a proton falls toward the Earth under the influence of gravity, it experiences only gravitational force and not magnetic force. The magnetic force on a charged particle depends on its velocity and the presence of a magnetic field. In this scenario, the proton is only subjected to the gravitational force directed towards the center of the Earth. Therefore, there is no magnetic force acting on the proton, resulting in a magnetic force of zero

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Answer:

D

Explanation:

D, Mass is the amount of matter in an object, it is measured in kg and does not change with gravity. Weight is the effect of gravity on mass, it is measured in Newtons (as it is a force) and changes with gravity. E.g. If you went to the moon your weight would change due to the change in gravity but your mass would stay the same.

Hope this helped!

To determine the average speed from hour 6 to 8, we need to know the total distance traveled during that time frame. The average speed provides a measure of the general rate of movement during the specified time frame, indicating how fast, on average, an object or person is covering distance over a given period.

Average speed is defined as the total distance traveled divided by the total time taken. In this case, the average speed from hour 6 to 8 represents the overall rate at which an object or person is moving during that two-hour period. For example, let's say you were driving a car during that time frame. If your average speed was 60 miles per hour (mph), it means that, on average, you were covering 60 miles of distance per hour. This doesn't necessarily imply that you were driving at a constant speed of 60 mph the entire time. It could be that you were driving faster during some portions and slower during others, but the overall average speed over the entire two-hour period is 60 mph. In a different scenario, if you were walking, and your average speed was 3 miles per hour, it means that you were covering 3 miles of distance per hour on average. Again, this doesn't imply a constant speed throughout the two hours but represents the overall average speed.

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The French train in a sample problem is traveling 301 km/h. When it is 360m from a road crossing, the engineer blows the whistle. If the speed of sound is 330 m/s, how many seconds after the whistle is heard at the crossing will the train cross there 0.57 sec

The speed of an object is the magnitude of the change of its position over time or the magnitude of the change of its position per unit of time; it is thus a scalar quantity.

Total velocity of the sound coming towards 631 m/sec. Time taken to reach is 360/631 = 0.57 sec

The French train in a sample problem is traveling 301 km/h. When it is 360m from a road crossing, the engineer blows the whistle. If the speed of sound is 330 m/s, how many seconds after the whistle is heard at the crossing will the train cross there 0.57 sec

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The degrees of freedom for between groups is determined as 3.

option A is the correct answer.

Degree of freedom, in groups of an experiment is the number of independent pieces of information used to calculate a statistic.

The number of degrees of freedom for the numerator is one less than the number of groups, or c - 1.

In the given experiment, we have  four different group, each consisting of 5 subjects, the degrees of freedom for between groups is calculated as;

degrees of freedom between groups = 4 - 1

degrees of freedom between groups = 3

Thus, the degrees of freedom for between groups is determined as 3.

option A is the correct answer.

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Answer:

left

Explanation:

When a force is applied in the opposite direction of motion, it opposes the motion of the object, causing its speed to decrease.

A force is an influence in physics that can change the motion of an object. A force can cause a mass object to change its velocity, or accelerate.

Intuitively, force can be described as a push or a pull. A force is basically a vector quantity as it has both magnitude and direction.

The term "force" has a specific meaning in science. At this level, it is perfectly acceptable to refer to a force as a push or a pull.

Another object applies a force to another. The concept of a force is not restricted to living or non-living things.

To slow a moving object, apply force in the opposite direction to the direction of motion.

Thus, the force should be applied from left to slow down the object.

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Answer:

hi

Explanation:

hi

Answer: I believe it’s location D. Or whichever is the location of slow crystallization.

Explanation: Slow crystallization of magma forms granite. Hope this helps. :)

Answer:

D

Explanation:

Answer:

north only

Explanation:

Answer:

b.

Explanation: I do not know much about this but the answer that i think it is was b.

A rock turns a reddish color when exposed to air and water. this description is evidence of chemical weathering

Chemical weathering is demonstrated by the fact that "a rock turns a reddish colour when exposed to air and water." The breakdown of rocks occurs through a process known as chemical weathering, which involves chemical interactions with elements including water, oxygen, and acids. The iron in the rock may have oxidised, which is when iron in the rock combines with oxygen and water to generate iron oxide (rust), giving the material its reddish hue. The physical weathering produced by wind-borne particles is described in Option A, the physical weathering induced by freeze-thaw cycles is described in Option B, and the physical weathering caused by gravity and the impact of the rock striking the ground is described in Option D.

Hence option C is correct.

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Answer:

A student is running at her top speed of 5. 4m/s to catch a bus.

Explanation:

Thats to fast

Answer:

Condensation

Explanation:

Answer:

Condensation! Hope this helps!!!

Explanation:

Answer:

One of the more important properties of sound is that its speed is nearly independent of frequency. ... Therefore, the relationship between f and λ is inverse: The higher the frequency, the shorter the wavelength of a sound wave. The speed of sound can change when sound travels from one medium to another.

Answer:

but the answer should be no as if 3 bulbs are connected together if one burns out the whole circuit will stop .hope you understood

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There are different kinds of vehicles.  it's actually dust because Mars is known to have Strong winds that tends to lift a lot of dust off the ground.

The atoms on Mars consist of Protons and Electrons. The atmosphere of Mars is known to be primarily composed of carbon dioxide, molecular nitrogen and argon. It has been found to have some little amount of water vapor, oxygen, carbon monoxide, hydrogen and noble gases.

A high percentage of water on Mars exists in form of ice, though it is said to exists in small quantities in vapor form in the atmosphere.

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6 degrees Celsius make 42.8 Fahrenheit. The calculation to convert from Fahrenheit to Celsius takes the Fahrenheit temperature, subtracts 32 from it, and then multiplies the result by 5/9.

To convert a temperature from degrees Celsius (°C) to degrees Fahrenheit (°F), use the formula \(F = (C * 9/5) + 32.\)

Therefore, to convert 6°C to Fahrenheit, we would use the following calculation:

\(F = (6C * 9/5) + 32\)

\(F = (54/5) + 32\)

°F = 10.8 + 32

°F = 42.8

Therefore, 6°C is equal to 42.8°F.

This conversion formula takes into account the difference between the two temperature scales, with Fahrenheit being the higher temperature scale and Celsius being the lower temperature scale.

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Option a is correct.

F=GMm/R²

where F is the gravitational force or weight

G is the universal constant of gravitation

M is the mass of Earth

m is the mass of the object

R is the distance between the center of the earth and the object

Given,

initial distance R =4000miles

weight at surface of the earth F=400lb

Let the force be F' for a distance R' from earth's center.

Here R' = radius+ height of the tower = R+4000 miles = 4000 + 4000 = 8000 miles.

Since the other terms in the formula remain constant, the new weight F' can be calculated as follows:

F'/F = R²/R'(otherwise the inverse square law in gravitation)

F'/400=(4000)²/(8000)²

F' = 100 lb

Thus option a is correct.

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The weight of the body on a 4000-mile high tower would still be 400 lbs.

The weight of an object depends on the gravitational acceleration at its location. On the surface of the Earth, the gravitational acceleration is approximately 32 ft/s2. Therefore, a 400 lb body on the Earth's surface would weigh 400 lbs. If the body were placed on a 4000-mile high tower, it would be much farther from the center of the Earth and experience a weaker gravitational pull. The weight of the body would decrease as the square of the ratio of the radii of the tower and the Earth. So, the weight on the tower would be:

Weight on the tower = (400 lb) * (4000 mi/4000 mi)2 = 400 lb * 1 = 400 lb

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Answer:

it is an example of a translucent object

Spring A has smaller stiffness.Stiffness is a measure of the spring's resistance to deformation. The stiffer the spring, the more resistant it is to deformation. When a load is applied to a spring, it experiences deformation. Stiffness is a measure of how much force is required to deform the spring by a certain amount.

Springs with higher stiffness require more force to deform them than springs with lower stiffness.A load of 100g placed on a spiral spring, A extends its spring by 2cm, whereas the same load placed on spiral spring, B extends it by 5cm. The stiffness of a spring is inversely proportional to the amount of deformation it experiences. Spring B will be less stiff because it experiences more deformation than Spring A.Spring stiffness is measured in units of force per unit of length. The spring constant k is a measure of stiffness. It is defined as the amount of force required to extend the spring by one unit of length.The spring constant k can be calculated as follows:F = kxWhere F is the force applied, k is the spring constant, and x is the amount of deformation experienced by the spring. We can use this formula to calculate the spring constants for A and B:kA = F/x = 100g/(2/100) = 5000 N/mkB = F/x = 100g/(5/100) = 2000 N/mSpring A has a higher stiffness (5000 N/m) than spring B (2000 N/m) because it requires more force to deform it by the same amount. Hence, spring A has smaller stiffness.

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Answer:

50m/s

Explanation:

Given parameters:

Acceleration  = 5m/s²

Time  = 10s

Unknown:

Final velocity of the puppy  = ?

Solution:

Acceleration is the rate of change of velocity with time taken. The puppy has an initial velocity of 0m/s.

 The formula is:

 Acceleration  = \(\frac{Final velocity - Initial velocity }{time}\)  

         5  = \(\frac{Final velocity - 0 }{10}\)  

               Final velocity  = 50m/s

Answer: Often lightning occurs between clouds or inside a cloud. But the lightning we usually care about most is the lightning that goes from clouds to ground.

Explanation:  As the storm moves over the ground, the strong negative charge in the cloud attracts positive charges in the ground.

The frequency heard by an observer in the moving car as they approach the police car is approximately 541 Hz.

To determine the frequency heard by an observer in the moving car as they approach the police car, we need to consider the Doppler effect. The Doppler effect is the change in frequency of a wave as a result of relative motion between the source of the wave and the observer.

The speed of sound in air is given as 343 m/s.

The velocity of the car approaching the police car is 36 m/s.

The frequency of the siren (relative to the police car) is 500 Hz.

The observed frequency (heard by the moving observer) can be calculated using the Doppler effect equation for sound:

observed frequency = (speed of sound + velocity of observer) / (speed of sound + velocity of source) * source frequency.

Plugging in the given values:

observed frequency = (343 m/s + 36 m/s) / (343 m/s) * 500 Hz

≈ 1.181 * 500 Hz

≈ 590.5 Hz.

Note: The velocity of the observer (moving car) is positive since they are approaching the source.

However, we need to consider that the observed frequency is affected not only by the motion of the observer but also by the motion of the source (siren) relative to the observer. In this case, the source (siren) is also stationary relative to the police car.

Since both the observer and the source are in motion, we need to take into account the relative motion between them. As the observer approaches the source, the effective relative velocity is the sum of their velocities. In this case, the effective relative velocity is 36 m/s.

To account for the relative motion between the observer and the source, we need to adjust the observed frequency. The observed frequency is increased when the observer approaches the source.

By applying the Doppler effect equation again with the adjusted relative velocity, we get:

observed frequency = (343 m/s + 36 m/s) / (343 m/s) * 590.5 Hz

≈ 1.181 * 590.5 Hz

≈ 696.5 Hz.

Note: The adjusted observed frequency is higher than the initial observed frequency due to the relative motion of the observer and the source.

Therefore, the frequency heard by an observer in the moving car as they approach the police car is approximately 541 Hz.

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Answer:

orce or acceleration b. Ms. Sunderland finally decided to take this seriously and put both hands on the rope and applied a 1000 N force to the left, while Jared and James still struggled with their 300 N force to the right. What is ... 150 more force. 10. During 5th period Dylan resisted the forces applied by her classmates in a ...

Explanation:

The correct answer is 120 V.

In the above question, ohm's law will be used. According to Ohm's law, the voltage across two places is precisely proportional to the current flowing through a conductor between them. The conductivity of the vast majority of electrically conductive materials over several orders of magnitude of the current is properly described by Ohm's law, an empirical relation. Non-ohmic materials, on the other hand, are those that do not adhere to Ohm's law. The German physicist Georg Ohm, who published a dissertation in 1827 describing measurements of applied voltage and current through basic electrical circuits with different lengths of wire, is credited with giving the rule its name.

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This is due to the fact that occluded fronts combine two cold air masses, which causes one of the cold air masses to go downward.

When a warm air mass is sandwiched between two cold air masses, an occluded front occurs. In an occlusion, the warm front passes over the cold front, which dives beneath it.

In a front is obscured, the warm front is fully supplanted by the cold front, in which the warm air masses have completely disappeared. Furthermore, there are frequent shifts in the various weather producing circumstances because of the cold front's relatively low temperature.

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This question involves the concepts of the equations of motion for both the vertical motion and the horizontal motion.

The diver "does not" hit the rock.

First, we will calculate the time taken by the diver to land. For this purpose, we will use the second equation of motion for the vertical motion of the diver:

\(h = v_{iy}t+\frac{1}{2}gt^2\)

where,

h = height of cliff = 44 m

\(v_{iy}\) = vertical component of the initial velocity of the diver = 0 m/s

t = time taken to land = ?

g = acceleration due to gravity = 9.81 m/s²

Therefore,

\(44\ m=(0\ m/s)t+\frac{1}{2}(9.81\ m/s^2)(t)^2\\\\t = \sqrt{\frac{(44\ m)(2)}{9.81\ m/s^2}}\)

t = 3 s

Now, we will calculate the horizontal distance where the diver landed. For this purpose, we will use the equation of motion for the horizontal motion of the diver. Assuming the air resistance to be zero the horizontal motion will be uniform. Hence:

\(s = vt\\s = (1.8\ m/s)(3\ s)\\\)

s = 5.4 m

Since the section of the rock was 4 m away from the cliff. Hence, the diver crossed that rock section and safely laded at a distance of 5.4 m, which is 1.4 m ahead of the rock section.

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The attached picture shows the equations of motion for the horizontal motion and vertical motion.

The maximum angle at which the bed can be tilted with respect to the floor before the patient begins to slide is 45°.

This is because the coefficient of static friction (μs) between the patient and the bed sheets is 1.2, and the coefficient of static friction is equal to the tangent of the angle of inclination (θ):

Static friction is the friction force that resists the initiation of motion. It is the force that one object exerts on another when they are not yet moving relative to each other. The coefficient of static friction is typically represented by the Greek letter μs, and is usually greater than the coefficient of kinetic friction (μk). The value of μs depends on the materials of the two objects that are in contact with each other.

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