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mamaluj [8]
3 years ago
8

Which theory was first proposed by Albert Einstein? A. the theory of special relativity B. the theory of universal gravitation C

. the theory of inertia D. the theory of radioactivity
Physics
2 answers:
Mumz [18]3 years ago
8 0

Answer:

A. the theory of special relativity is the correct answer.

Explanation:

The theory of special relativity was first proposed by Albert Einstein.

Albert Einstein his Special theory of relativity determined that the speed of light inside the vacuum is the same irrespective of the speed at which the observer sees.

The theory of special relativity explains that the speed of light remains the same for all the non accelerating observers and describes that the mass can be changed into energy and energy can be changed into a mass.

balu736 [363]3 years ago
6 0

A. the theory of special relativity

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Einstein and Lorentz, being avid tennis players, play a fast-paced game on a court where they stand 25.0 m from each other. Bein
Lerok [7]

Answer:

A) 199.78 J

B) 9.292x10^14 J

C) 4.2x10^7 m/s

D) 0.65 m

E) 1.13x10^-8 sec

D) 2.94x10^-9 sec

Explanation:

mass of ball = 0.0580 kg

A)

If smashed at v = 83.0 m/s, KE is

KE = 0.5mv^2

= 0.5 x 0.0580 x 83.0^2

= 199.78 J

B) if returned at v = 1.79×10^8 m/s, KE will be

KE = 0.5mv^2

= 0.5 x 0.0580 x (1.79×10^8)^2

= 9.292x10^14 J

C) during Einstein's return, velocity of rabbit relative to players is

Vr = 2.21×108 m/s

Rabbit's velocity relative to ball = 2.21×10^8 - 1.79×10^8

= 4.2x10^7 m/s

D) the rabbit's speed approaches the speed of light so we consider relativistic effect. The rabbit's measured distance is

l = l°( 1 - v^2/c^2)

= 2.5(1 - 2.21/3)

= 2.5 x 0.26

= 0.65 m

E) according to the players, the time taken by the rabbit is

t = d/v = 2.5/ 2.21×10^8

= 1.13x10^-8 sec

F) the time for rabbit as measured by rabbit is relativistic

t = t°( 1 - v^2/c^2)

= 1.13x10^-8 (1 - 2.21/3)

= 1.13x10^-8 x 0.26

= 2.94x10^-9 sec

7 0
3 years ago
How much work is needed to pump all the water out of a cylindrical tank with a height of 10 m and a radius of 5 m
balu736 [363]

Answer:

Explanation:

volume of water being lifted

= π r² h , where r is radius of cylinder and h is height of cylinder

= 3.14 x5² x 10

= 785 m³

mass of water = 785 x 10³ kg

mass of this much of water is lifted so that its centre of mass is lifted by height

10 / 2 = 5m .

So work done = mgh , m is mass of water , h is displacement of centre of mass and g is acceleration due to gravity

= 785 x 10³ x 9.8 x 5

= 38.465 x 10⁶ J  

6 0
3 years ago
A car has a mass of 975 kg. by pushing on the car, evan increses its speed from 0.5 m/s to 3 m/s. what impulse did evan apply to
jarptica [38.1K]
Impulse = change in momentum = F x dt
Where F is sufficiently large and dt is very small(tending to zero).

Therefore impulse = mass x final velocity - mass x initial velocity
                                = 975 x 3 - 975 x 0.5
                                = 2437.5 Kg-m/s. 
Hence option C is correct.

7 0
2 years ago
Read 2 more answers
Why is copper a pure substance? A. Because it is an element B. Because it is a compound C. Because it is a homogenous mixture​
expeople1 [14]
A) because it is an element.
Explanation: usually when they say pure substance they mean pure element.
Hope this helped!! :)
3 0
2 years ago
HELP DUE 3 MINUTESSSSSS
Katen [24]

Answer:

I only know that acid rain is one of them!! It can erode rocks and weather down

Explanation:

3 0
2 years ago
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