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3 years ago

Scientists have documented that the current level of carbon dioxide in the atmosphere is _________

Physics

1 answer:

Leni [432]3 years ago

7 0

Scientists have documented that the current level of carbon dioxide in the atmosphere is increasing.

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A beam of electrons with of wavelength of 7.5 x 10-6 m is incident on a pair of narrow rectangular slits separated by 0.75 mm. T

ale4655 [162]

Just try your hardest

3 0

3 years ago

A racquetball strikes a wall with a speed of 30 m/s and rebounds in the opposite direction with a speed of 26 m/s. The collision

Fudgin [204]

Answer:

The average acceleration of the ball during the collision with the wall is $a=2,800m/s^{2}$

Explanation:

Known Data

We will asume initial speed has a negative direction, $v_{i}=-30m/s$ , final speed has a positive direction, $v_{f}=26m/s$ , $\Delta t=20ms=0.020s$ and mass $m_{b}$ .

Initial momentum

$p_{i}=mv_{i}=(-30m/s)(m_{b})=-30m_{b}\ m/s$

final momentum

$p_{f}=mv_{f}=(26m/s)(m_{b})=26m_{b}\ m/s$

Impulse

$I=\Delta p=p_{f}-p_{i}=26m_{b}\ m/s-(-30m_{b}\ m/s)=56m_{b}\ m/s$

Average Force

$F=\frac{\Delta p}{\Delta t} =\frac{56m_{b}\ m/s}{0.020s} =2800m_{b} \ m/s^{2}$

Average acceleration

$F=ma$ , so $a=\frac{F}{m_{b}}$ .

Therefore, $a=\frac{2800m_{b} \ m/s^{2}}{m_{b}} =2800m/s^{2}$

8 0

3 years ago

Section 1 - Question 30

stira [4]

Answer : A
Explanation: he is motivated to make the football team

3 0

3 years ago

John and Caroline go out for a walk one day. This graph represents their distance from home.

vivado [14]

Answer:

C) They walked in one direction, then they were still, then they walked in the opposite direction.

Explanation:

John and Caroline go out for a walk one day. This graph represents their distance from home.c According to the graph they walked with almost same in both the direction.

First they walked in one direction and travel 30 meter in same direction then they were still for some time. Then they walked in the opposite direction for 30 meter. They walked in both the direction with approximately equal speed.

Thus, Option C is correct.

5 0

3 years ago

Read 2 more answers

Help!!! Earth science !!!

goblinko [34]

Answer:

D
The same
b

Explanation:

$\frac{159.4}{59.7} = 2.67$
Because, well, science? Don't know how to explain
Because, well science again. Well, physics.

7 0

2 years ago