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3 years ago

Which statements best describe science? Check all that apply.

Physics

2 answers:

guajiro [1.7K]3 years ago

5 0

Answer:D

Explanation:

Leno4ka [110]3 years ago

3 0

D because it's true, an example would be weather. A recent science report said that for the next few years, winter will get colder until 2022.

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What is the unit of work? (select all that apply) *

galina1969 [7]

Answer:

Joule is the answer

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3 years ago

A plastic rod that has been charged to -21 nc touches a metal sphere. afterward, the rod's charge is -8 nc. (a) what kind of cha

otez555 [7]

The rod transferred negatively charged particle to the metal sphere. The rod becomes less negatively charged than it was originally (originally it was charged to -21 nc, now it has -8, and -8>-21), so it must have moved 13 nc of negative charge to the sphere.

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4 years ago

The biodiversity of cultivated crops is currently under threat

Angelina_Jolie [31]

C. Establishing a seed bank with a variety of seeds of

different crop species

Explanation:

Establishing a seed bank with a variety of seeds of different crop species is a cooperative behavior that would best enable humans to prevent the problem of loss of biodiversity of cultivated crops.

Modern agricultural practices is profit driven and centered on mono-cropping.
Mono-cropping is an agricultural practice in which only one crop type is cultivated on a mechanized scale.
Mono-cropping leads to less diversity of crop species as just only the cultivation of economically important crops are encouraged.
In order to avert the menace that comes along with mono-cropping, seed banks are viable place to keep and protect other plant species from going into extinction.
Seed banks provides a preservation of different plant species by focusing on storing their viable seeds.

Learn more:

Inhumane farming brainly.com/question/4674681

#learnwithBrainly

4 0

3 years ago

Read 2 more answers

High-speed stroboscopic photographs show that the head of a -g golf club is traveling at m/s just before it strikes a -g golf ba

pav-90 [236]

The question is incomplete. The complete question is :

High-speed stroboscopic photographs show that the head of a 200 g golf club is traveling at 60 m/s just before it strikes a 50 g golf ball at rest on a tee. After the collision, the club head travels (in the same direction) at 40 m/s. Find the speed of the golf ball just after impact.

Solution :

We know that momentum = mass x velocity

The momentum of the golf club before impact = 0.200 x 60

= 12 kg m/s

The momentum of the ball before impact is zero. So the total momentum before he impact is 12 kg m/s. Therefore, due to the conservation of momentum of the two bodies after the impact is 12 kg m/s.

Now the momentum of the club after the impact is = 0.2 x 40

= 8 kg m/s

Therefore the momentum of the ball is = 12 - 8

= 4 kg m/s

We know momentum of the ball, p = mass x velocity

4 = 0.050 x velocity

∴ Velocity = $\frac{4}{0.050}$

= 80 m/s

Hence the speed of the golf ball after the impact is 80 m/s.

6 0

3 years ago

Explain how Earth, the moon, and the Sun move relative to one another.

Annette [7]

If you stand on top of the sun, and one foot off of the surface so that you don't rotate with the sun, while wearing the calendar watch you bought on Earth . . .

. . . the Sun rotates under your feet about once a month;

. . . you see the Earth revolving around you once a year;

. . . you see the Moon revolving around you once a year, and ALSO wiggling slightly in and out, slightly nearer and farther from you. When it's nearer, it's slightly nearer to you than the Earth is. When it's farther, it's slightly farther from you than the Earth is. About half of the wiggle, it's slightly to the left of the Earth, ahead of the Earth in its orbit. The other half, it's slightly to the right of the Earth, behind the Earth in its orbit. The Moon goes through a complete one of these near-and-far wiggles every 27.3 days.

If you stand on top of the Earth, and one foot off the ground so that you don't rotate with the Earth . . .

. . . the Earth rotates under your feet about once every 24 hours;

. . . you see the Sun revolving around you once a year;

. . . you see the Moon revolving around you once every 27.3 days. The Moon is also rotating, but it takes exactly the same 27.3 days to rotate once, so it ends up keeping the same side facing you all the time, and you can never see anything on the other side.

If you stand on top of the Moon, one foot off of the surface so that you don't rotate with the Moon, while wearing the same calendar watch that you bought on Earth . . .

. . . the Moon rotates under your feet, about once every 27.3 days;

. . . you see the Earth revolving around you at exactly the same rate, about once every 27.3 days, so that if you look down at the Moon beneath your feet, you notice that the same side of it is always facing the Earth, and the other side of the Moon can never see the Earth.

. . . you see the Sun revolving around you once a year.

6 0

4 years ago