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3 years ago

According to Einstein, space and time are _____

Physics

2 answers:

madreJ [45]3 years ago

7 0

Answer:

Relative; curved; gravity.

Explanation:

According to Einstein, space and time are relative and are parts of a whole universe that has four dimensions. Masses in the universe curved space-time, and the resulting shape of space-time cause gravity.

The above theory is known as the General Relativity or General Theory of Relativity and it was published in 1915 by Albert Einstein.

Basically, it states that universe curved space-time is directly proportional to the energy and momentum of matter and radiation that is present. Thus, gravity is the universe curved space-time caused by massive objects.

ELEN [110]3 years ago

7 0

Answer:

Complete the passage to describe one of the features of Einstein’s general theory of relativity.

According to Einstein, space and time are

relative

and are parts of a whole universe that has four dimensions. Masses in the universe

curve

space-time, and the resulting shape of space-time causes

gravity

correct on Edge2021

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Answer:

The rock's speed after 5 seconds is 98 m/s.

Explanation:

A rock is dropped off a cliff.

It had an initial velocity of 0 m/s. And now it is moving downwards under the influence of gravitational force with the gravitational acceleration of 9.8 m/s².

Speed after 5 seconds = V

We know that acceleration = average speed/time

In our case,

g = ((0+V)/2)/5

9.8*5 = V/2

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3 years ago

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While on a playground, you and your niece take turns sliding down a frictionless slide. Your mass is 75 kg while your little nie

Olenka [21]

Answer:

Explanation:

In absence of friction, total mechanical energy must be conserved.
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$\Delta K = \Delta U \\ \\ \frac{1}{2} * m* v^{2} = m*g*h$

As it can be seen, the mass m is on the both sides of the equation, which means that it can be simplified.
We can solve this equation for v (speed at the bottom) as follows:

$v = \sqrt{2*g*h}$

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The option c is the right one.

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3 years ago

A student grabs a piece of paper and tears it from the middle. Which statement best explains the forces involved?

PolarNik [594]

Answer:

b. The normal force between the molecules of the paper is overcome by the contact force of the hands.

Explanation:

The paper molecules are held together by a weak bond. When the student holds the paper on both sides with the center of the paper in between, the student applies two equal forces in the opposite direction of the paper making the paper molecules weaken and separate.

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3 years ago

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The lowest point in Death Valley is 85 m below sea level. The summit of nearby Mt. Whitney has an elevation of 4420 m.What is th

mario62 [17]

Answer:

$\Delta E=2.87\times 10^6\ J$

Explanation:

It is given that,

Depth of Death valley is 85 m below sea level, $h_i=-85\ m$

The summit of nearby Mt. Whitney has an elevation of 4420 m, $h_f=4420\ m$

Mass of the hiker, m = 65 kg

We need to find the change in potential energy. It is given by :

$\Delta E=mg(h_f-h_i)$

$\Delta E=65\times 9.8(4420-(-85))$

$\Delta E=2869685\ J$

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So, the change in potential energy of the hiker is $2.87\times 10^6\ J$ . Hence, this is the required solution.

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3 years ago

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