1. Sometimes in very cold places water pipes burst. Give reason why.

Answers

Answer 1

Answer: Water is the only known substance that gets BIGGER when it freezes.
That's why ice cubes float in liquid water, and the reason that pipes
or cans of soda spring leaks when the liquid water that they're full of
freezes and gets bigger.

Answer 2

Answer: When is very cold, water freezes in pipes expanding and turns into ice. This frozen water is expanding and bursting pipe.

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Explain how the atoms of the element helium are formed in a star

Please

Answers

When fusion happens in a star from the helium isotopes it has bi products helium which is only done during the first lot of fusion reactions

One major cause of floods isA. rapid spring snowmelt.
B. light rain over a large area.
C. a decrease in stream discharge.
D. increased capacity of stream channels.

Answers

The correct answer is A. rapid spring snowmelt. When the spring times come, sometimes there's a lot of warmth that suddenly comes, especially nowadays when there's things such as global warming. So the snow melts and large amounts of water can flood the fields that are often found at the foot of a mountain or similar things.

The answer to this question is A. Rapid Spring Snowmelt. You can find the answer in Pearson Earth Science Part 1 Textbook. "A heavy downpour or rapid snowmelt can flood canyons with a mixture of soil, rock, and water."

Hope this helps. Have a great day!

Explain why a light wave refracts when it travels through mediums such as air to water.

Answers

The simplest explanation is that the speed changes. That causes the wavefront to change direction and so refraction takes place.

Planet 1 has mass 3m and radius r, while planet 2 has mass 4m and radius 2r. they are separated by center-to-center distance 8r. a rock is placed halfway between their centers at point o. it is released from rest. ignore any motion of the planets.Part (a) Derive an expression, in terms of relevant system parameters, for the magnitude of the acceleration a of the rock at the moment it is released Part (b) Calculate the magnitude of the acceleratiom of the rock (in m/s2) the moment it is released, using M=2x10^21 kg and R= 25 x10^6
Part (c) The rock is released from rest at point o Derive an expression for the speed v with which the rock crashes into a planet Part (d) Calculate the speed the rock crashes into the planet in m/s

Answers

The magnitude of the rock's acceleration half-way between two planets is 1.086 m/s².

The given parameters;

mass of planet, A = 3M

radius of the planet A, = R

mass of planet B, = 4M

radius of planet B, = 2R

distance between the two planets, r = 8R

The gravitational force half-way (4R) between the two planets is calculated from Newton's universal gravitational law as follows;

SEE IMAGE 1

The magnitude of the rock's acceleration is calculated from Newton's second law of motion as follows;

SEE IMG 2

Thus, the magnitude of the rock's acceleration is 1.086 m/s².

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Karen shouts across a canyon and hears an echo 7.5 s later. how wide is the canyon? the speed of sound is 343 m/s. answer in units of m.

Answers

After Karen shouts, the sound wave of her voice travels across the canyon, it hits the walls, and then it comes back to Karen in a total time of t=7.5 s. If we call L the distance between Karen and the other side of the canyon (so, L is the width of the canyon), it means that the sound wave covers a distance of S=2L in this time.
Since the wave moves by uniform motion, we can use the usual relationship between space, time and velocity:
$v= (S)/(t)= (2L)/(t)$
where v=343 m/s is the speed of sound. Using this number, we can find L from the previous equation:
$L= (vt)/(2)= ((343 m/s)(7.5 s))/(2)=1286 m$
So, the canyon is 1286 meters wide.

A can cause a driver to take risky chances or make bad choices

Answers

-- loud radio
-- heavy rain
-- girl friend in the car
-- misguided sense of privilege or importance
-- misguided sense of immortality

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