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Scrat [10]
3 years ago
10

Which is used for comparison to determine if another object is in motion?

Physics
1 answer:
Brut [27]3 years ago
8 0

Answer:

D. Reference Point

Explanation:

An object is in motion if it changes position relative to a reference point

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Which of the following statements about electromagnetic waves in free space are true? (There could be more than one correct choi
Vanyuwa [196]

Answer:

The electric field carries the same mount of energy as the magnetic field

The frequency of the magnetic field is the same as the frequency of the electric field.

Explanation:

Let's analyze each option in detail:

The electric and magnetic fields have equal amplitudes. --> FALSE. In fact, the amplitudes of the electric and magnetic field are related by the equation:

E=cB

where

E is the amplitude of the electric field

B is the amplitude of the magnetic field

c is the speed of light

Therefore, from the equation we see that the amplitude of the electric field is much larger than that of the magnetic field.

The electric field carries the same mount of energy as the magnetic field. --> TRUE.

The energy carried by the electric field is:

u_E = \frac{1}{2}\epsilon_0 E^2

where \epsilon_0 is the vacuum permittivity.

The energy carried by the magnetic field is:

u_B = \frac{1}{2\mu_0}B^2

where \mu_0 is the vacuum permeability.

Given the following relationship:

c=\frac{1}{\sqrt{\epsilon_0 \mu_0}}

We can write

E=cB=\frac{1}{\sqrt{\epsilon_0 \mu_0}}B

So

u_E = \frac{1}{2}\epsilon_0 (\frac{1}{\sqrt{\epsilon_0 \mu_0}}B)^2=\frac{1}{2\mu_0}B^2

which means u_E=u_B.

The electric field carries more energy than the magnetic field. --> FALSE, because in disagreement with the calculations above.

The frequency of the magnetic field is the same as the frequency of the electric field. --> TRUE. In an electromagnetic waves, electric field and magnetic field oscillate at the same frequency.

The frequency of the electric field is higher than the frequency of the magnetic field. --> FALSE, because in disagreement with the previous statement.

8 0
3 years ago
I will give 14 points & make you the brainiest
Virty [35]

Answer:

B. silicate rocks and metals

8 0
3 years ago
YALL PLS HELP ME! CAN YOU GUYS CHECK MY ANSWERS?
Ugo [173]

Answer:

1. Newton's First Law of Motion

2.Newton's Third Law of Motion

3.Newton's Third Law of Motion

4.Newton's Second Law of Motion

5.Newton's Third Law of Motion

6.Newton's Second Law of Motion

7.Newton's First Law of Motion

Explanation:

Newton's First Law of Motion states that an object remain at rest or moving with a uniform velocity unless an external force acts on it. This is the law of inertia

Newton's Second Law of Motion states that the force of an objects is the product of mass and acceleration.

Newton's Third Law of Motion states that when two objects interact, a pair of forces act on the objects, and they are equal and act in opposite directions.

4 0
3 years ago
Q1=-q2=q3=2.10^-8 đặt tại A,B,C .tìm lực điện tổng hợp tác dụng lên q4=2.10^-8 đặt tại D sao cho ANCD là hình
KiRa [710]

Answer:

Wala ko ka sabot ana oy sorry

5 0
3 years ago
Why are systems in Dynamic Equilibrium stable?
yaroslaw [1]

Answer:

Dynamic Equilibrium are stable because there is an equal rate of transition between reactants and products, or between the forward and the reverse process, in a back and forth manner, such that the net change of the concentration or system is zero, and therefore, there are no excess force factor, tending to create a different outcome

Explanation:

Dynamic equilibrium, in physics and in chemistry, is the equilibrium experienced by a system that undergoes change, where however, both the forward and the reverse effect of the change are taking place.

4 0
3 years ago
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