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3 years ago

Which is true about carbon-12 compared with carbon-13

1 answer:

7 0

E mass number of any given atom depends solely on the number of protons and neutrons in its nucleus. The mass number of any atom can be determined by adding the number of protons and neutrons. (Mathematically this is stated as Mass Number = Protons + Neutrons). For instance, a Carbon atom with 6 protons and 6 neutrons will have a mass number of 12AMU. However, a Carbon atom with 6 protons and 8 Neutrons will have a mass number of 14AMU. They are both Carbon atoms, however they each have a different mass number. Atoms of the same element that have different numbers of neutrons, and therefore, different mass numbers, are called isotopes. Isotopic symbols are used to indicate isotopes of the same elements. In the following isotopic symbols the lower number is the atomic number…it is the number of protons. The upper number is the mass number, it represents to sum of the protons and neutrons in the atoms nucleus.

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A person trying to lose weight should

drek231 [11]

This is a very wierd question but I will answer.It is A

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5 0

3 years ago

Read 2 more answers

A small 0.14 kg metal ball is tied to a very light (essentially massless) string that is 0.9 m long. The string is attached to t

Vsevolod [243]

Answer:

a) v=2.743m/s

b) $a_c = 8.363m/s^2$

c) T=2.543N

Explanation:

First, calculate the height of the ball at the starting point:

$y' = 0.9cos(55)$

$y' = 0.516$

At this point, just in the moment the ball is released, all the energy of the system is potencial gravitational energy. When it is at the bottom all the potencial energy is transformed into kinetic energy:

$E_p=E_k\\mgh=\frac{mv^2}{2}$

Solving for v:

$v=\sqrt{2gh}$

if h is the height loss: (l-y')

v=2.743m/s

The centripetal acceleration is the acceleration caused by the tension force exercised by the string, and is pointing outside of the trayectory path (at the lowest point, directly dawn):

$a_c=\frac{v^2}{r}$

$a_c = 8.363m/s^2$

To calculate tension, just make the free body diagram of forces in the ball, noticing the existence of the centripetal acceleration:

$\sum{F_y}=ma_c=T-W\\T=ma_c+W\\T=m(a_c+g)\\T=0.14(8.363+9.8)\\T=2.543N$

4 0

4 years ago

Please help it's for a test.

Andreas93 [3]

Answer:

Explanation:

$KE=\frac{1}{2}mv^2$ so filling in:

$KE=\frac{1}{2}(1000)(30)^2$ so to 2 sig figs (which is actually not accurate, but oh well...)

KE = 450000 J

If we want to find out how high it will have to travel up a hill so that its PE is the same as the KE at this speed, we set the value for KE = to PE:

450000 = (1000)(9.8)h so

$h=\frac{450000}{(1000)(9.8)}=45.9m$

7 0

3 years ago

Who is ready for Track?? I am but I really am hating it rn

mars1129 [50]

Answer:

Me too

Explanation:

7 0

3 years ago

A wire along the z axis carries a current of 4.9 A in the +Z direction. Find magnitude of the force exerted on a 3.3 cm long len

Free_Kalibri [48]

Answer:

F = - 6.95 10⁻² j^ N

Explanation:

The force on a wire carrying current through a magnetic field is

F = i L x B

The bold letters indicate vectors, as the wire is in the positive Z axis and the magnetic field in the negative x axis, the force must be in the negative y axis

the force module

F = i LB

that there is 90º between the two vectors and the sin 90 = 1

let's calculate

F = 4.9 3.3 10⁻² 0.43

F = 6.95 10⁻² N

the force vector is

F = - 6.95 10⁻² j^ N

3 0

3 years ago