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3 years ago

About how much of Earth's land surface is used for agriculture? 8% 18% 28% 38%

Physics

2 answers:

Alexxandr [17]3 years ago

6 0

We use about 38 percent of Earth's land surface for agriculture

tino4ka555 [31]3 years ago

3 0

Studies show its about 38%

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vagabundo [1.1K]

Answer:

Force = mass × acceleration

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${ \tt{15 = (22 \times a)}} \\ { \tt{a = \frac{15}{22} \: {ms}^{ - 2} }}$

From first Newton's equation of motion:

${ \bf{v = u + at}}$

Change = v - u:

${ \tt{v - u = (a \times t)}} \\ { \tt{v - u = ( \frac{15}{22} \times 1.2) }} \\ { \tt{v - u = 0.82 \: {ms}^{ - 2} }}$

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3 years ago

A 17-car train standing on the siding is started in motion by the train’s engine. 9 cm slack is between each of the cars, which

BaLLatris [955]

Answer:

4 seconds

Explanation:

There are links between cars, they are in between

1-2, 2-3, 3-4, 4-5, 5-6, 6-7, 7-8, 8-9, 9-10, 10-11, 11-12, 12-13, 13-14, 14-15, 15-16, 16-17.

Here 1 represents the first car which is firmly attached to the engine. So, there are 16 links and each link has a slack of 9 m.

So, total slack

9×16 = 144 cm

Speed of train = 36 cm/s

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Time taken by the pulse to travel the length of train is 4 seconds.

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3 years ago

Please someone help me with this!!!

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Answer: Gravitational potential energy changes.

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2 years ago

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