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3 years ago

What does the narrator mean when he says that energy is old as time itself

Physics

2 answers:

ddd [48]3 years ago

8 0

Answer:

The narrator means that all the energy in the universe now was present when the universe started to form long ago

Explanation:

Pavlova-9 [17]3 years ago

4 0

Answer: "The narrator means that all the energy in the universe now was present when the universe started to form long ago."

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A 1250 kg car starts from rest and speeds up to 14.0 m/s in 7.25s. How much force acted on the car ?

densk [106]

M = 1250 kg
V = 14.0 m/s
t = 7.25 s
F = ?

Impulse equation
F . t = m . V

:. F = mv/t

F = (1250 kg x 14.0 m/s) / 7.25s

F = 2414 N

4 0

4 years ago

Please help

natali 33 [55]

Answer:

Thermosphere

temperature continue to rise up to 1500*C

Ionosphere

Mesosphere

temperature falls to -93*C

Stratosphere

protective ozone layer

UV radiation causes temperature to rise

Troposphere

78% nitrogen, 21% oxygen

temperature drops from 17 to -52*C

Explanation:

3 0

3 years ago

I think these two are simple questions.. but I need help asap..... TT

frosja888 [35]

1) The average velocity is 56 m/min

2) The average velocity is -83 m/min

Explanation:

The average velocity of an object is given by

$v=\frac{d}{t}$

where

d is the displacement (change in position)

t is the time elapsed

In the graph in the problem, the displacement corresponds to the distance, therefore to the change in the y-variable ( $\Delta y$ ), while the time elapsed is the change in the x-variable ( $\Delta x$ ), so the average velocity can be written as

$v=\frac{\Delta y}{\Delta x}$

At point A, we have:

$y_A = 5 m\\x_A = 0.1 min$

At point B, we have:

$y_E = 55 m\\x_A = 1 min$

So, we have

$\Delta y= 55 -5 = 50 m\\\Delta x = 1.0-0.1 = 0.9 min$

So the average velocity is

$v=\frac{50 m}{0.9 min}=56 m/min$

In this part instead, we have the following:

At point F, we have:

$y_F = 55 m\\x_A = 1.3 min$

At point H, we have:

$y_H = 30 m\\x_A = 1.6 min$

So, we have

$\Delta y= 30 -55 = -25 m\\\Delta x = 1.6-1.3 = 0.3 min$

So the average velocity is

$v=\frac{-25 m}{0.3 min}=-83 m/min$

Learn more about velocity:

brainly.com/question/8893949

brainly.com/question/5063905

#LearnwithBrainly

4 0

3 years ago

Rony fills a bucket with water and whirls it in a vertical circle to demonstrate that the water will not spill from the bucket a

Romashka-Z-Leto [24]

Answer:

0 N, 3.49 m/s

Explanation:

Draw a free body diagram for the bucket at the top of the swing. There are two forces acting on the bucket: weight and tension, both downwards.

If we take the sum of the forces in the radial direction, where towards the center is positive:

∑F = ma

W + T = m v² / r

The higher the velocity that Rony swings the bucket, the more tension there will be. The slowest he can swing it is when the tension is 0.

W = m v² / r

mg = m v² / r

g = v² / r

v = √(gr)

Given that r = 1.24 m:

v = √(9.8 m/s² × 1.24 m)

v = 3.49 m/s

8 0

3 years ago

A housefly walking across a clean surface can accumulate a significant positive or negative charge. In one experiment, the large

nalin [4]

Answer:

1681714.28571 N/C

Yes it could exist

Explanation:

m = Mass of housefly = 12 m

q = Charge = 70 pC

g = Acceleration due to gravity = 9.81 m/s²

E = Electric field

When an object accumulates charge it means that it is gaining electrons making it negatively charged. This is the concept of static electricity.

Here, the electric force and the graviational force will balance each other

$F_e=W\\\Rightarrow qE=mg\\\Rightarrow E=\frac{mg}{q}\\\Rightarrow E=\frac{12\times 10^{-6}\times 9.81}{70\times 10^{-12}}\\\Rightarrow E=1681714.28571\ N/C$

1681714.28571 N/C of electric field would be required to levitate

The direction of the electric field would be upwards vertically.

In air the critical value of electric field is $3\times 10^6\ N/C$ which is more than the critical value of electric field in air. So, the electric field can exist.

5 0

3 years ago