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3 years ago

20. Using the picture, how many neutrons does lithium have?

Physics

1 answer:

Igoryamba3 years ago

8 0

Answer:

No. of Neutrons = 3

Explanation:

The atomic number of Lithium is given as 3 in the symbol while the mass number is given as 5.941 which is approximately equal to 6.

Mass Number = No. of Protons + No. of Neutrons = 6

Atomic Number = Number of Electrons = No. of Protons = 3

Therefore,

Mass Number - Atomic Number = (No. of Protons + No. of Neutrons) - No. of Protons

Mass Number - Atomic Number = No. of Neutrons

No. of Neutrons = 6 - 3

No. of Neutrons = 3

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The isotope of an atom containing 40 protons and 51 neutrons suddenly has 2 neutrons added to it. What isotope is created?

timama [110]

The isotope of an atom containing 40 protons and 51 neutrons suddenly has 2 neutrons added to it
That is X-93 so it will be
Zirconium-93
hope it helps

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3 years ago

Energy that is passed on from one trophic level to the next is called what?

yan [13]

Energy decreases as it moves uptrophic levels because energy is lost as metabolic heat when the organisms from one trophic level are consumed by organisms from the next level.Trophic level transfer efficiency (TLTE) measures the amount of energy that is transferred between trophic levels.

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3 years ago

What is umax,c, the value of the maximum energy stored in the capacitor during one cycle?

TiliK225 [7]

1) 0.266 H

2) 0.040 J

3) $0.308\Omega$

Explanation:

The diagram of the circuit is missing: find it in attachment.

1) What is L, the value of the inductance of the circuit?

For an RLC circuit, the resonant angular frequency is given by:

$\omega=\frac{1}{\sqrt{LC}}$

where

L is the inductance of the circuit

C is the capacitance of the circuit

In this problem, we have:

$\omega=164 rad/s$ is the angular frequency of the generator, at which the circuit is in resonance

$C=140 \mu F = 140\cdot 10^{-6}F$ is the capacitance

Therefore, solving for L, we find the inductance of the circuit:

$L=\frac{1}{\omega^2 C}=\frac{1}{(164)^2(140\cdot 10^{-6})}=0.266 H$

2) What is umax,c, the value of the maximum energy stored in the capacitor during one cycle

The maximum energy stored in a capacitor is given by the equation

$U=\frac{1}{2}CV^2$

where

C is the capacitance of the capacitor

V is the maximum potential difference across the capacitor

Here we have:

$C=140 \mu F = 140\cdot 10^{-6}F$ is the capacitance

$V=24 V$ is the maximum voltage across the capacitor, which is the emf of the generator

Substituting, we find:

$U=\frac{1}{2}(140\cdot 10^{-6})(24)^2=0.040 J$

3) What is R, the value of the resistance of the circuit?

Here we want to find the resistance of the circuit.

The resistance of the circuit can be found by using Ohm's Law:

$V=RI$

where

V is the maximum voltage

R is the resistance

I is the maximum current

Here we have:

V = 24 V is the maximum voltage provided by the generator

I = 0.78 A is the maximum current in the circuit

Solving for R, we find the resistance:

$R=\frac{V}{I}=\frac{0.24}{0.78}=0.308\Omega$

6 0

3 years ago

A car starts from rest and accelerates from u seconds until it reaches a speed of 10ms

9966 [12]

Distance = speed* time

10x10^-3 *u + 10x10^-3 * 2u = 125

0.01u + 0.02u = 125

0.03u = 125
u = 4166.66666.... s

acceleration = (final velocity - initial velocity)/time

(10x10-3 - 0)/4167 = 2.3998 * 10^-6 m s-2

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3 years ago

A weather balloon is partially inflated with helium gas to a volume of 2.0 m³. The pressure was measured at 101 kPa and the temp

Yanka [14]

Answer:

4.7 m³

Explanation:

We'll use the gas law P1 • V1 / T1 = P2 • V2 / T2

* Givens :

P1 = 101 kPa , V1 = 2 m³ , T1 = 300.15 K , P2 = 40 kPa , T2 = 283.15 K

( We must always convert the temperature unit to Kelvin "K")

* What we want to find :

V2 = ?

* Solution :

101 × 2 / 300.15 = 40 × V2 / 283.15

V2 × 40 / 283.15 ≈ 0.67

V2 = 0.67 × 283.15 / 40

V2 ≈ 4.7 m³

7 0

2 years ago