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4 years ago

A scientist adds different amounts of salt to 5 bottles of water. She then

Physics

2 answers:

Vika [28.1K]4 years ago

7 0

A. The time it takes for the water to boil.

because that is what you are testing

kolezko [41]4 years ago

3 0

A. the time it take for the water to boil
that’s what i got

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Energy is ____________________ when light is directed upward into the night sky and lost into ____________________.

lisov135 [29]

1: Lost (?)
2: Space (?)
........................

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3 years ago

How does gravity relate to potential energy?

Nookie1986 [14]

Answer:

the potential energy a massive object has in relation to another massive object due to gravity

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3 years ago

Read 2 more answers

As a clump of interstellar gas contracts to become a main-sequence star, its changing position on the H-R diagram tells us _____

Stels [109]

Answer:

how its outward appearance is changing

Explanation:

H-R diagram is a fundamental tool used to classify stars. The position of stars on the H-R diagram is dependent on its luminosity and temperature.

The position of the star is represented by its outward appearance specially the color. The hottest and brightest the star, the more it lies between the red and blue color range.

The cooler stars lie on the right side of the H-R diagram while the hot stars lie on the left side of the H-R diagram.

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3 years ago

A rocket blasts off vertically from rest on the launch pad with an upward acceleration of 2.90 m/s2 . At 20.0s after blastoff, t

Brilliant_brown [7]

Answer:

A) 580m

B) 0 m/s

C) 9.8m/s^2

D) downward

E) 10.87s

F) 106.62 m/s

Explanation:

A) The distance traveled by the rocket is calculated by using the following expression:

$y=\frac{1}{2}at^2$

a: acceleration of the rocket = 2.90 m/s^2

t: time of the flight = 20.0 s

$y=\frac{1}{2}(2.90\frac{m}{s^2})(20.0s)^2=580m$

B) In the highest point the rocket has a velocity with magnitude zero v = 0m/s because there the rocket stops.

C) The engines of the rocket suddenly fails in the highest point. There, the acceleration of the rocket is due to the gravitational force, that is 9.8 m/s^2

D) The acceleration points downward

E) The time the rocket takes to return to the ground is given by:

$t=\sqrt{\frac{2y}{g}}=\sqrt{\frac{2(580m)}{9.8m/s^2}}=10.87s$

10.87 seconds

F) The velocity just before the rocket arrives to the ground is:

$v=\sqrt{2gy}=\sqrt{2(9.8m/s ^2)(580m)}=106.62\frac{m}{s}$

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3 years ago

A friction force that acts on objects that are not in motion is what

weqwewe [10]

Answer:

Static friction

Explanation:

Static friction is the friction force that acts on objects that are not moving.

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3 years ago