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Y_Kistochka [10]

4 years ago

15

Why should people pay attention to scientists when making decisions? A)scientist are the smartest people B) Scientist make up fa

cts that they wish true C) scientist use experiments to test their ideas D) scientist are always correct

2 answers:

kykrilka [37]4 years ago

7 0

C . Scientists use experiments to test their ideas

MrRa [10]4 years ago

3 0

Answer:

C) scientist use experiments to test their ideas

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A 7.91g bullet is fired into a 1.52-kg ballistic pendulum initially at rest and becomes embedded in it. The pendulum subsequentl

Stella [2.4K]

Answer:

D

Explanation:

By law of conservation of momentum:

momentum before collision = momentum after collision

$m_{1} u_1 + m_2 u_2 = m_1 v_1 + m_2 v_2\\ m_1 = mass of bullet\\u_1 = initial speed of bullet\\m_2 = mass of pendulum\\u_2 = initial speed of pendulum\\v_1 = final speed of bullet\\v_2 = final speed of pendulum$

Initial speed of bullet is unknown whereas initial speed of pendulum will be zero as it was at rest.

Final speed of bullet and pendulum will be equal as bullet is embedded in pendulum and both moves together a vertical distance of 6.89cm.

Using third equation of motion:

$2 a S = v_{f}^2 - v_{i}^2$

where:

$a = -g = acceleration due to gravity = 9.8 m/s^2 ( for vertical motion)\\S = h = 6.89cm = Vertical height or distance it covers\\v_f = final speed = 0 (after covering 6.89cm)\\v_i = initial speed (unknown)$

Thus by placing values $v_i = 1.1620 m/s$

this speed will be final speed of collision for the calculation of initial speed of bullet.

Putting values:

$(7.91) * x + (1.52*10^3) * 0 = (7.91 + 1.52*10^3) * 1.162\\7.91 x = 1775.431\\x = 224m/s$

This 224m/s = 0.224Km/s which is closest to D

8 0

3 years ago

How should a line look like if an object is at rest(stopped) on a distance-time graph?

guajiro [1.7K]

If an object is at rest, then its distance doesn't change as time goes on.

On the graph, the points for each time are all at the same distance. They form a horizontal line.

5 0

3 years ago

Children are ready for more complex storybooks:

FromTheMoon [43]

Answer:

4

Explanation:

Because that is when they're mind learns how to read

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3 years ago

How do you select the appropriate tools for caregiving rated task effectively?

Gwar [14]

Answer:

Care giving tools like medical devices or any medical supplies which aid the effectiveness of care for the patient will help the quality of work of care giving. ... All of the care giving tool should also be efficient and effective

4 0

3 years ago

Read 2 more answers

What percentage of the power of the battery is dissipated across the internal resistance and hence is not available to the bulb?

spin [16.1K]

Lets us consider an example:

Suppose a 10 ohm bulb is connected across the terminals of a 10 V

battery having 2ohm internal resistance.

Then total reistance in series we know, R1 + R2

Thus, R net = 10+ 2 = 12 ohm

The, current across circuit = 10/12= 0.833 A

Now, Power is given by $P = i^{2} R \\ \\$

Thus, power dissipated across internal resistance, P = $0.83^{2} * 2 = 1.37 Watt$

And, total power dissipated = $0.83^{2} * 12 = 8.2 watt$

Thsu, percentage of pwer not avaible = 1.37/8.2 = 16.70%

5 0

4 years ago