It is incorrect because the two types of ions in sodium phosphate cannot be seen.
Answer: 6.48m/s
Explanation:
First, we know that Impulse = change in momentum
Initial velocity, u = 19.8m/s
Let,
Velocity after first collision = x m/s
Velocity after second collision = y m/s
Also, we know that
Impulse = m(v - u). But then, the question said, the guard rail delivered a "resistive" impulse. Thus, our impulse would be m(u - v).
5700 = 1500(19.8 - x)
5700 = 29700 - 1500x
1500x = 29700 - 5700
1500x = 24000
x = 24000/1500
x = 16m/s
Also, at the second guard rail. impulse = ft, so that
Impulse = 79000 * 0.12
Impulse = 9480
This makes us have
Impulse = m(x - y)
9480 = 1500(16 -y)
9480 = 24000 - 1500y
1500y = 24000 - 9480
1500y = 14520
y = 14520 / 1500
y = 9.68
Then, the velocity decreases by 3.2, so that the final velocity of the car is
9.68 - 3.2 = 6.48m/s
In an alpha decay, an atom emits an alpha particle. An alpha particle consists of 2 protons and 2 neutrons: this means that during this kind of decay, the original atom loses 2 protons and 2 neutrons from its nucleus.
This also means that the atomic number Z of the element (the atomic number is the number of protons in the nucleus) decreases by 2 units in the process, while the mass number A (the mass number is the sum of the number of protons and neutrons) decreases by 4 units.
If we use the sun as a distant object to calculate the convex lens's focal length, we obtain a number that is more closely related to the actual convex lens value.
We need to learn more about a convex lens's focal length in order to locate the solution.
<h3>Why, if we concentrate the sun, do we obtain a focal length that is closer to the correct value?</h3>
- An optical system's focal length is a measurement of how sharply the light converges or diverges.
- The distance between the convex lens's pole and its focus is known as its focal length.
- Convex lenses focus all of the rays from the distant object at their focal point to create a true image.
- We receive a crisper image if the object is farther away from the lens.
- Away from the focal point, an image will form if we concentrate on a neighboring window.
- To get the focal point on a distant tree, we must move the screen in the direction of the lens.
We can therefore draw the conclusion that if we use the sun as a distant object, we will obtain a value that is closer to the convex lens's actual value.
Learn more about a convex lens's focal length here:
brainly.com/question/28039799
#SPJ1
Answer:
Spectral
Explanation:
I just answered this question on USA test prep