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1 year ago

15

2. How has the growth of Earth's human population changed in recent decades? In your answer, discuss growth rate and the number

of people added each year.

1 answer:

Serhud [2]1 year ago

5 0

Humans population had dropped by half since the 1960s from 2.2% in 1962 to 1.15% today

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If a force does a positive amount of work on an object, does the object’s speed increase, decrease, or remain the same? Justify

iris [78.8K]

Answer:

see that there is no dependence on speed, so the work remains constant

Explanation:

Work is defined by the expression

W = F. d

where the boldface indicates vectors, this equation can be written in scalar form

W = f d cos θ

where θ is the angle between force and displacement.

We see that there is no dependence on speed, so the work remains constant

The power is

P = W / t

P = f d / t

p = F v

we see that the power is the one that depends on the speed of the body

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3 years ago

During __________, frequently used synaptic connections in the brain strengthen while rarely used connections tend to thin.

Oxana [17]

The answer should be D. Synaptogenesis

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2 years ago

Read 2 more answers

My car engine can generate 3000 Newtons of force and the car masses 1500 kg. How fast can the sports car accelerate?

xeze [42]

Answer:

The sports Car can accelerate at 2 m/s².

Explanation:

Force:

Force is the push or pull on an object with mass that causes it to change velocity or to accelerate.

Force represents as a vector, which means it has both magnitude and direction.

Given:

Mass of car = 1500 kg

Force = 3000 Newtons

To Find:

Acceleration, = ?

Solution:

Formula:

$Force = Mass\times Acceleration\\F= ma\\3000 = 1500\times Acceleration\\Acceleration = \frac{3000}{1500} \\Acceleration = 2\ m/s^{2}$

Therefore, the sports Car can accelerate at 2 m/s².

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2 years ago

How much time would it take for the sound of thunder to travel 1,500 meters if sound travels at a speed of 330 m/sec?

Fittoniya [83]

(1,500 meters) x (1 sec / 330 meters) = (4 and 18/33) seconds

(4.55 sec, rounded)

8 0

3 years ago

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Three point charges are placed at distances of d , 2 d , and 3 d from a point P. The particle that is 2 d away from P has a char

mel-nik [20]

Answer:

at d the charge will be 3q and at 3d it will be 9q

Explanation:

for V=Vp-V2d

V=KQ/d=K*6q/2d=3kq/d for potential to 2d at 6q be zero the Vp will equal 3kq/d; hence at d, Q=3q and at 3d, Q=9q

7 0

2 years ago