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IgorLugansk [536]
2 years ago
15

The distances in space are based on astronomical units, which are average distances between the Sun and Earth. True False quizle

t
Physics
1 answer:
leva [86]2 years ago
6 0

The correct answer is true.

<h3>What is an astronomical units?</h3>

The astronomical unit  is a unit of length equal to 150 million kilometres (93 million miles) or 8.3 light minutes. The actual distance between Earth and the Sun fluctuates by around 3% as Earth revolves the Sun in a year, from a maximum (aphelion) to a minimum (perihelion) and back again. The astronomical unit was formerly defined as the average of Earth's aphelion and perihelion; however, it has been defined as 149597870700 m since 2012.  

The astronomical unit is generally used to measure distances inside the Solar System or between stars.

learn more about astronomical units refer:

brainly.com/question/12904051

#SPJ4

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A 0.690 kg snowball is fired from a cliff 8.25 m high with an initial velocity of 10.3 m/s, directed 32.0° above the horizontal.
Lana71 [14]

Answer:

a) 16.4 m/s

b) 16.4 m/s

c) 16.4 m/s

Explanation:

a)

m = mass of the snowball = 0.690 kg

h = height of the cliff = 8.25 m

v₀ = initial speed of ball at the time of launch = 10.3 m/s

v = speed of the ball as it reach the ground

Using conservation of energy

initial kinetic energy + initial potential energy at the cliff = final kinetic energy just before reaching the ground

(0.5) m v₀² + mgh = (0.5) m v²

(0.5) v₀² + gh = (0.5) v²

(0.5) (10.3)² + (9.8 x 8.25) = (0.5) v²

v = 16.4 m/s

b)

As the launch angle is changed, the speed of the ball just before reaching the ground remain the same as the final speed does not depend on the angle of launch.

v = 16.4 m/s

c)

As the mass is changed, the speed of the ball just before reaching the ground remain the same as the final speed does not depend on the mass of the ball.

v = 16.4 m/s

7 0
4 years ago
If the nucleus of an atom contains 12 protons how many electrons are there in a neutral atom why
kicyunya [14]
For a neutral atom number of electrons equals number of protons, in other for the net charge of the atom to be zero...
no. of electrons = 12
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The Sun exerts a gravitational force of 29.9 N on a rock that's located in a river bed here on Earth. How much gravitational for
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Answer:

F = 29.9 N

Explanation:

It is given that, The Sun exerts a gravitational force of 29.9 N on a rock that's located in a river bed here on Earth. We need to find the gravitational force the rock exert on the Sun. It is a case of Newton's third law of motion which states that the force acting from one object to another is equal to the force acing from second object to the first object and the two forces must be in opposite direction. Hence, the gravitational force the rock exert on the Sun is same i.e. 29.9 N.

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A wave has a frequency of 240 Hz and a wavelength of 3.0m what is the speed of the wave
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Answer:

240 ms

Explanation:

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