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ValentinkaMS [17]
3 years ago
12

Newton’s Second Law of motion defines force in terms of mass and acceleration, F= ma. Which of the following is false? The term

for force in the above equation represents the net force on the object.
The forces creating the net force can lie in any direction.
The forces creating the net force must lie in the same direction.
The acceleration is directed in the same direction as the net force.
A zero net force indicates a state of equilibrium.
Physics
1 answer:
NikAS [45]3 years ago
5 0

Answer:

The forces creating the net force must lie in the same direction.

Explanation:

newton's second law states that the net force acting on the body is equal to the product of mass and the acceleration of the body.

If there are several forces acting on the body in different directions, then we have to find teh net force by using the vector sum and then find the acceleration.

It is not necessary that all the forces acting in the same direction.

if they are in different directions then we have to find the net force by t=using the formula for the vector sum.

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When making maps of the large-scale universe, astronomers estimate distances to the vast majority of galaxies by using:
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<em>The comoving distance and the proper distance scale</em>

<em></em>

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The comoving distance scale removes the effects of the expansion of the universe, which leaves us with a distance that does not change in time due to the expansion of space (since space is constantly expanding). The comoving distance and proper distance are defined to be equal at the present time; therefore, the ratio of proper distance to comoving distance now is 1. The scale factor is sometimes not equal to 1. The distance between masses in the universe may change due to other, local factors like the motion of a galaxy within a cluster.  Finally, we note that the expansion of the Universe results in the proper distance changing, but the comoving distance is unchanged by an expanding universe.

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3 years ago
A long, thin straight wire with linear charge density λ runs down the center of a thin, hollow metal cylinder of radius R. The c
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Answer:

E=\dfrac{\lambda }{2\pi \varepsilon _or}

Explanation:

Given that

For straight wire

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For hollow metal cylinder

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We know that electric filed for wire given as

E_w=\dfrac{\lambda_{wire} }{2\pi \varepsilon _or}

E_w=\dfrac{\lambda }{2\pi \varepsilon _or}

Now the electric filed due to hollow metal cylinder

E_c=\dfrac{\lambda_{cylinder} }{2\pi \varepsilon _or}

E_c=\dfrac{2\lambda }{2\pi \varepsilon _or}

Now  by considering the Gaussian surface r<R then only electric fild due to wire will present.So

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E=\dfrac{\lambda }{2\pi \varepsilon _or}

5 0
3 years ago
A lawyer drives from her​ home, located 88 milesmiles east and 1818 milesmiles north of the town​ courthouse, to her​ office, lo
myrzilka [38]

Answer:

the distance between the​ lawyer's home and her office is 124 miles

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first lets assume that

x-axis (west = positive, east = negative)

y-axis (north = positive, south = negative)

thus,

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thus, the distance between the​ lawyer's home and her office

R = √(x₂ - x₁)² + (y₂ - y₁)²

   = √(13 - (-88))² + (-54 -18)²

   = 124 miles

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The lens changes the focal distance of the eye so that you can focus on images/objects. 
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