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LUCKY_DIMON [66]
2 years ago
14

Astronomers believe that the universe began as an enclosed, cold object. true or false?

Physics
2 answers:
Margarita [4]2 years ago
6 0

Answer: False

Explanation:

Astronomers believe that the universe began as a point (singularity) where all the matter of the universe was enclosed. The point had infinite density and extremely high temperature. The universe started expanding at t =0 when big bang occurred. With the expansion of the universe, the temperature started reducing. Detection of Cosmic Microwave Background Radiation is in agreement with this theory.

Thus, the given statement is false.

zhannawk [14.2K]2 years ago
4 0
<span>Scientists believe that the earliest state of the universe was hot and dense. So I think this is false.</span>
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Mass is a measure of weight. True False
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Answer: False

Explanation: Mass is a measure of the amount of matter in an object.

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2 years ago
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A bullet is fired with a muzzle velocity of 1178 ft/sec from a gun aimed at an angle of 26° above the horizontal. Find the horiz
dalvyx [7]

Answer:

1058.78 ft/sec

Explanation:

Horizontal Component of Velocity; This is the velocity of a body that act on the horizontal axis. I.e Velocity along x-axis

The horizontal velocity of a body can be calculated as shown below.\

Vh = Vcos∅.......................... Equation 1

Where Vh = horizontal component of the velocity, V = The velocity acting between the horizontal and the vertical axis, ∅ = Angle the velocity make with the horizontal.

Given: V = 1178 ft/sec, ∅ = 26°

Substitute into equation 1

Vh = 1178cos26

Vh = 1178(0.8988)

Vh = 1058.78 ft/sec

Hence the horizontal component of the velocity = 1058.78 ft/sec

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3 years ago
The only force acting on a 3.0 kg canister that is moving in an xy plane has a magnitude of 5.0 N. The canister initially has a
bekas [8.4K]

Answer:

The work done on the canister by the 5.0 N force during this time is

54.06 Joules.

Explanation:

Let the initial kinetic energy of the canister be

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Let the the final kinetic energy of the canister be

KE₂ = \frac{1}{2} mv_2^{2} = \frac{1}{2} *3*7.0^{2} = 73.5 J in the y direction

Therefore from the Newton's first law of motion, the effect of the force is the change of momentum and the difference in energy between the initial and the final

= 73.5 J - 19.44 J = 54.06 J

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3 years ago
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Answer:

you divide the distance by the time it takes to travel that same distance, then you add your direction to it.

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2 years ago
What explains the dramatically different magnitudes of accelerations that result when a mosquito collides head on with a moving
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Mass of the vehicle and small bug.

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  • But according to Newton's second law, force is mass times acceleration. Since the force on each mass is same, the smaller mass will accelerate more and the heavier mass will accelerate less for the same force.
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Learn more about Newton's law.

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