When a star collapses to form a black hole, its mass _____.a. decreases
b. remains the same
c. increases

Answers

Answer 1

Answer: When a star collapses to form a black hole,its mass increases, that is letter C. One example of this is the Big BangTheory.

It is by no doubt that our universe had had its ownstarting point but how it really started became a debate for the scientistsover the past centuries. From theories such as Ekpyrotic theory, White Holes,Matrix theory, and Quantum theory, the Big Bang theory is the theory mostlyaccepted by scientists. According to the theory, the universe started as asingularity, that is, from a black hole under extreme gravitational pressureand expanded (instead of exploded) and cooled. Its cooling, according to thetheory, is still happening now as of the moment.

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Every 4 years we have a leap year on our calander to make up the extra.......

What is the exact time of a full earth rotation?

Answers

Partyrockchickk is on the right track,but 23:56:04 is not exactly exact.
23h 56m 4.0906s is closer, but stillnot exact. You'll never see an 'exact'
number written anywhere. Firstbecause it doesn't work out to an exact
decimal of anything, and secondbecause it changes ! The Good Friday
earthquake in Alaska changed it,the Fukushima earthquake changed it,
the Nepal earthquake changed it,and the daily drag of the tides changes
it by something like 0.001second every century.

One thing's for sure: It is definitely not 24 hours.

The exact time is 23 hours, 56 minutes, and 4 seconds. hope this helps hun

On a sky coaster (human pendulum) that reaches 20 meters from it's equilibrium position, a man of 70 kg is able to reach a maximum speed of

Answers

Answer:

Explanation:

Using the principle of conservation of energy, the potential energy is converted to kinetic energy, assuming any losses.

Kinetic energy is given by ½mv²

Potential energy is given by mgh

Where m is the mass, v is the velocity, g is acceleration due to gravity and h is the height.

Equating kinetic energy to be equal to potential energy then

½mv²=mgh

Making v the subject of the formula

v=√(2gh)

Substituting 9.81 m/s² for g and 20 m for h then

v=√(2*9.81*20)=19.799 m/s

Rounding off, v is approximately 20 m/s

Answer:

19.8 m/s

Explanation:

During the motion of a pemdulum bob, it casually converts kinetic energy to potential energy and vice versa.

A pendulum bob reaches its maximum speed at a position closest to its equilibrium position and has its lowest when it is farthest from the equilibrium position.

The maximum speed of a pendulum bob based on the mass involved and the maximum displacement from the equilibrium position is obtained from

Maximum kinetic energy = Maximum potential energy

Maximum potential energy occurs at the farthest point from equilibrium, that is,

P.E(max) = mgh

Maximum kinetic energy = ½mv²

½mv² = mgh

v = √2gh

g = acceleration due to gravity = 9.8 m/s²

h = farthest height from equilibrium position = 20 m

v = √(2×9.8×20) = 19.8 m/s

Hope this Helps!!!

What kinds of bonds are possible between carbon and oxygen?

Answers

covalent bond I think

The headlights are shining on a truck travelling at 100 km/h. The speed of the light from the headlights relative to the road will be:A) c

B) c + 100 km/h

C) c – 100 km/h

D) depends on the temperature, but faster than the speed if the truck was not moving.

E) faster than if the truck was not moving, but impossible to calculate with the given information

Answers

Answer:

A) c

Explanation:

Speed of light is always constant irrespective of the wave source's motion and the observer's inertial frame of reference. So, no matter how fast the car is moving the speed of light will always be constant. The speed of light in air is around 299704644.54 m/s. The meter is also defined by the speed of light as 1 meter is the distance travelled by light in 1/299792458 second.

A, the light generated from the headlights travels at a fixed speed relative to the road

Calculating average speed

Answers

Average speed =

(distance covered during some period of time)
divided by
(length of time to cover that distance).

A train traveling at 82.8 kilometers per hour is blowing its horn as it approaches you. The horn has a frequency of 312 Hz. Assume the speed of the sound is 331 m/s. What is the observed frequency of the horn?335 Hz
312 Hz
292 Hz
412 Hz

Answers

The answer is 335 Hz.

To calculate this, we will use the following formula:
f₀ = f × v ÷ (v - v₁)
where:
f₀ - frequency heard
f - actual frequency
v - speed of sound
v₁ - speed of source

We know:
f = 312 Hz
v = 331 m/s
v₁ = 82.8 km/h = 23 m/s

We need:
f₀ = ?

f₀ = f × v ÷ (v - v₁)
⇒ f₀ = 312 Hz x 331 m/s ÷ (331 m/s - 23 m/s)
⇒ f₀ = 312 Hz × 331 m/s ÷ 308 m/s
⇒ f₀ = 335.3 Hz ≈ 335 Hz

Thus, the frequency of the horn is 335 Hz.

Answer:

335 Hz

Explanation:

100%

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