A body with a mass of 2,000 kg is lifted to a height of 15 m within a time of 15 s. Which one of the following statements concerning the action is true?a. The gravity force on the body is 294,000 N.
b. The potential energy of the body is 30,000 J.
c. The amount of work is 450,000 J.
d. The power exerted is 19,600 W.

Answers

Answer 1

Answer: So we want to know which statement is true for the body of mass m=2000kg that is lifted to a height of h=15m in t=15 s. Lets calculate each of the following: Gravity force on the body is F=m*g=2000*9.81=19620 N so a is FALSE. Potential energy of the body when it is lifted to the height of 15 m is Ep=m*g*h=2000*9.81*15=294300 J so b is FALSE. Work to lift the body is: W=Fg*h=2000*9.81*15= Ep=294300 J so c is FALSE. Power P=W/t=294300/15=19620 W So d is TRUE.

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c. What is its period in seconds?
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Which best explains why the shapes of a liquid can change

Answers

the shape of a liquid can change because the atoms in it are not close together to form a solid, they flow freely.

The shape of a liquid can change because of the bonds between its atoms. Atoms in a liquid are loosely bonded, allowing them to roll over one another but not completely escape one another. In contrast, the atoms in a solid are so closely packed together that they can only vibrate in place, while the atoms in a gas have such little attraction between them that they fly in every direction and do not stay near one another at all. In a liquid, the atoms still stay close to one another, but are able to move, changing the overall shape of the liquid.

Hope this helps!

Why does a vibraing simple pendulum not produce any sound

Answers

Human ear can hear the lowest frequency about 20 Hz, this is 20 vibrations per second. Vibrations of pendulum are very small and frequency is less than 20 Hz, so we can't hear it.

It does, but the sound is at a frequency that's too low for you to hear.
If you could build a pendulum short enough so that it made 20 or more
complete swings every second, THEN you'd begin to hear sound from it.

There are _____ levels of cell organization recognized by biologists.

Answers

There are five (5) levels of cellorganization recognized by biologists. They are cells, tissues, organs, organsystems and organisms. These are applicable to multicellular organisms thoughas they are needed for the cells to sustain their functions alone andeventually coordinating with one another. Cells are the basic unit of life, when grouped together, they aretissues. When tisuues are grouped together, they are organs and organ systems comprisesof two or more organs to function and overall, creating an organism.

Answer:

there are 5

Explanation:

You take a trip to a star located 1,000 light-years away and return. you travel at an average speed of 0.99c. hint: the time dilation formula is: t′=t1−(vc)2−−−−−−−−√. about how many years will pass on earth while you are gone?

Answers

Answer: 70712.44 ly

Using the following time dilation formula:

$t = \frac {t_o} {\sqrt{1- \frac {v^2}{c^2}}}$

where $t_o$ is the time measured in the moving frame, $v$ is the speed of the moving frame, $c$ is the speed of light and $t$ is time measured in other frame.

Inserting the values:

$t = \frac {1000 ly} {\sqrt{1- \frac {(0.99c)^2}{c^2}}}\n \Rightarrow t=\frac {1000 ly} {√(1-(0.99)^2)} \n \Rightarrow t=(1000ly)/(0.0141)=70712.44 ly$

Therefore, when a trip to a star 1000 ly years away is made with speed 0.99 c, 70712.44 ly would have passed on Earth.

Final answer:

Approximately 999 years will pass on Earth while you are gone.

Explanation:

The formula for time dilation is t′ = t1 - (vc)2 / c.
To calculate how many years will pass on Earth while you are on this trip, we need to determine the time experienced by the astronaut and then use the time dilation formula.
According to the information provided, the astronaut travels at an average speed of 0.99c, so v = 0.99c. The star is located 1,000 light-years away, so t1 = 1,000 years.
Plugging these values into the time dilation formula, we get:

t′ = 1,000 years - (0.99c)2 / c = 1,000 years - 0.9801 years = 999.0199 years.

Therefore, approximately 999 years will pass on Earth while you are gone.

Learn more about Time dilation here:

brainly.com/question/1933572

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What is average velocity of a particle?

Answers

Average velocity during a time interval is

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divided by
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in the direction
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Avg. velocity = total Displacement / Total time taken
PLEASE MARK BEST

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