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Arte-miy333 [17]
3 years ago
13

Pleasse help

Physics
2 answers:
GaryK [48]3 years ago
3 0

Hi,

The correct answer is letter B.

The last group contains noble gases, while both along the top and along the bottom the elements on the right are non-metals.

inn [45]3 years ago
3 0

Answer:

Group 2

Explanation:

The second group consists of only alkaline earth metals, because it posses beryllium, magnesium, calcium, strontium, barium, and radium.

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A roller skater of 47kg moving with a velocity of 12 m/s to the east picks up a bag of 6.0 kg. What is the final velocity of the
WITCHER [35]

Answer:

v_f = 10.85 m/s

Explanation:

We will apply the law of conservation of momentum here:

m_{1}v_{1i} + m_{2}v_{2i} = m_{1}v_{1f}+m_{2}v_{2f}\\

where,

m₁ = mass of roller skater = 47 kg

m₂ = mass of bag = 6 kg

v_1i = initial speed of roller skater = 12 m/s

v_2i = initial speed of the bag = 0 m/s

v_1f = final speed of the roller skater = ?

v_2f = final speed of the bag = ?

Both the bag and the skater will have same speed at the end because kater is carrying the bag:

v_1f = v_2f = v_f

Therefore, the equation will become:

(47\ kg)(12\ m/s)+(6\ kg)(0\ m/s)=(47\ kg)(v_{f})+(5\ kg)(v_{f})\\564\ N.s = (47\ kg+5\ kg)(v_{f})\\v_{f} = \frac{564\ N.s}{52\ kg}\\

<u>v_f = 10.85 m/s</u>

8 0
3 years ago
An apple falls out of a tree from a height of 2.3m. what is the impact speed of the apple
Anuta_ua [19.1K]

Answer:6.71 m/s

Explanation:

Given

Apple fall from a height of h=2.3 m  

We need to find the impact speed of apple which can be given by using

v^2-u^2=2gh  

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u=initial velocity

h=Displacement

Assuming initial velocity to be zero

substituting the value we get

v^2-0=2\times 9.8\times 2.3  

v=\sqrt{2\times 9.8\times 2.3}  

v=6.71\ m/s  

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How do animals get the nitrogen they need<br>​
Alenkinab [10]

Answer:

Animals get the nitrogen they need by eating plants or other animals that contain nitrogen.

Explanation:

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Darya [45]

Mass of car, M=2000kg

Velocity, V=72× 5/18 =20ms¹

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v² -u² = as

0 − 20² =2a×20

a=−10ms^-2

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Apply first kinematic equation

v = u +at

t= \frac{v - u}{a}  =  \frac{0 - 20}{ - 10}  = 2sec\\

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Which of the following sources of pollution would be the most difficult to track and regulate?
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