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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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Answer:the human retina can only detect incident light that falls in waves 400 to 720 nano-meters long so we cant see microwave or ultraviolet wavelengths. this also applies to infrared lights which has wavelengths longer than visible and shorter than microwaves thus being invisible to the human eye

Explanation:

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3 years ago
The velocity of a wave is a function of its:<br><br> energy<br> form<br> medium<br> amplitude
algol [13]

Answer:

Amplitude.

Explanation:

The velocity of a wave is given by :

velocity = total distance covered/total time taken

In the case of a wave the total distance covered is equal to the amplitude of a wave. It is the maximum displacement covered by the wave. So, the velocity of a wave is a function of its amplitude. Hence, the correct option is (D).

4 0
3 years ago
A wooden object (conically shaped) has a diameter of 8cm and height of 14cm. It floats in oil with 6cm of its height above oil l
baherus [9]

Answer:

(a) The density of the object is 316/343 × the density of the oil

(b) The fraction of oil displaced after immersing the object is 0.461 of the oil volume

Explanation:

(a) The volume, V of a cone of height, h and base diameter, D = 2×r is given by the following equation;

V = \dfrac{\pi r^{2} h}{3}

The volume of the object is therefore;

\dfrac{\pi \times 4^{2} \times 14}{3} = 74\tfrac{2}{3}\pi \, cm^3

Where 6 cm is above the oil level we have;

\dfrac{\pi \times \left (6 \times \dfrac{4}{14}   \right )^{2} \times 6}{3} = 5\tfrac{43}{49}\pi \, cm^3 above the oil level

Therefore, volume of the oil displaced = 68\tfrac{116}{147}\pi cm³ = 216.11 cm³

The density of the object is thus;

\dfrac{68\tfrac{116}{147}\pi}{ 74\tfrac{2}{3}\pi} \times  Density \ of \ the \ oil = \dfrac{316}{343}  \right ) \times  Density \ of \ the \ oil

The density of the object = 316/343 × the density of the oil.

(b) The volume of the oil = 2 × Volume of the object = 2 \times 74\tfrac{2}{3}\pi \, cm^3 = 149\tfrac{1}{3}\pi \, cm^3

The fraction of the volume displaced, x, after immersing the object is given as follows;

x = \dfrac{68\tfrac{116}{147}\pi}{ 149\tfrac{1}{3}\pi} = \dfrac{158}{343} = 0.461

The fraction of oil displaced after immersing the object = 0.461 of the volume of the oil

8 0
3 years ago
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vredina [299]

Answer:

Review the explanation.

Explanation:

Hydropower does not generate CO2 emissions, therefore it is not a factor in the generation of global warming. The initial investment of this type of projects in construction is large but this investment can be recovered in the future, since the system guarantees reliability in the supply of energy. It generates employment as technical and engineering personnel are needed for the operation of each of the equipment that is part of the hydroelectric plant.

As for the defects, is that most hydropower should be located near rivers, therefore to access the construction of this project must cut trees and remove animals from their natural habitat.

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Atoms form chemical bonds to satisfy the blank rule and become blank​
Masja [62]

Answer:

Atoms form chemical bonds to satisfy the Octet rule and become Stable element.

Explanation:

  • Every atom desires to achieve total eight valence electron in their outermost shell to become stable. This rule is known as octet rule.
  • During the chemical reaction process, every element goes through the process of receiving or donating the element to complete the octet rule to become stable.
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