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stellarik [79]
2 years ago
10

An object is moving at a constant velocity. All but one of the following statements could be true. Which one cannot be true?

Physics
1 answer:
likoan [24]2 years ago
6 0

Answer:

b.A single force acts on the object.

Explanation:

Newton's first law establishes that an object at rest remains at rest and an object in motion will have constant velocity if the result of the forces acting on them is zero

An object acceleration can be defined as the variation of velocity in an interval of time:                            

a = \frac{v_{f}-v_{i}}{t_{f}-t_{i}}   (1)  

Where v_{f} is the final velocity, v_{i} is the initial velocity,  t_{f} is the final time and t_{i} is the initial time.

If the velocity is constant there is no variation of velocity, therefore, the acceleration will be 0.

Newton's second law can be used To show that no forces act on the object:

R = ma (2)

Where R is the resultant of all the forces, m is the mass and a is the acceleration.

Since there is no acceleration for an object with constant velocity, equation (2) can be expressed as:

R = m(0)

R = 0  

So it is correct to say that an object with constant velocity has no forces acting on it.

In the other hand in the case of several forces acting on the object, The net force (R) can be zero if they have the same magnitude and opposite direction

So (a), (c) and (d) are correct because of what was previously discussed.

<u>Note that b cannot be true since it violates Newton's first law, since the object is moving at a constant velocity. </u>

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A satellite is in a circular orbit 8200 km above the Earth’s surface; i.e., it moves on a circular path under the influence of n
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Answer:

5.23km/s

Explanation:

Given

Radius of Earth = 6.37 * 10^6 m

Altitude of Satellite = 8200km = 8200 * 10³m = 8.2 * 10^6 m

Gravity Acceleration on Satellite Altitude = 1.87965m/s²

For a satellite to remain in circular orbit, then it means the acceleration of gravity must be exact as the centripetal acceleration.

Centripetal Acceleration = V²/R

So, Acceleration of Gravity (A)= Centripetal Acceleration = V²/R

Make V the subject of formula

A = V²/R

V² = AR

V = √AR

Where R = (radius of earth) + (altitude of satellite)

R = 6.37 * 10^6 + 8.2 * 10^6

R = 14.57 * 10^6m

A = 1.87965m/s²

V = √(1.87965 * 14.57x10^6)

V = √27386500.5

V = 5233.211299001789

V = 5233.2113 m/s ------- Approximated

V = 5.23km/s

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3 years ago
Coil the wire around the nail. Connect one end of the wire to the positive battery terminal. Connect the other end of the wire t
Andrej [43]
Static i think 
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What is the lens equation?
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The lens equation gives d relation between focal length, object distance n image distance.

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seldon
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3 years ago
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You might say that this experiment was an attempt to build a scale, and then calibrate it against a scale that we trust (the ele
Allushta [10]

No.

Since repeated measurements are taken and the average and 95% confidence interval are calculated, the possibility of the lack of agreement being a random error has been minimized or even eliminated.

<h3>What is a random error?</h3>

Random error is defined as the deviation of the total error from its mean value due to chance.

Random errors can result from the instrument not being precise or from mistakes by the researcher.

Random errors can be minimized by taking multiple readings and averaging the results.

Since repeated measurements are taken and the average and 95% confidence interval are calculated, the possibility of the lack of agreement being a ransom error has been minimized.

Learn more about random errors at: brainly.com/question/22041172

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2 years ago
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1. ¿Cuál es el actor clave de del exceso de peso corporal?
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El peso de un cuerpo es definido por la relación entre la energía requerida para los procesos vitales del cuerpo, sus actividades físicas diarias y la energía suministra en forma de alimentos.

Cuando estos dos parámetros están en balance el peso es estable, pero cuando la cantidad de alimentos aumenta o el valor energético de los mismo aumenta se tiene un exceso de energía que el cuerpo almacena en forma de grasa corporal, este el el factor mas importante para el exceso de peso.

En conclusión el factor mas importante para el exceso de peso es un  exceso de energía por una alimentación excesiva

aprende mas acerca del peso corporal aquí:

brainly.com/question/13032223

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