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4 years ago

How can you calculate the number of electrons in an atom

Physics

2 answers:

Serga [27]4 years ago

7 0

Convert 1 atom into 10 electrons (I think)

Gelneren [198K]4 years ago

6 0

The atomic number( number in the top left corner of the element’s box on the Periodic Table)

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When you place an egg in water, it sinks. If you add salt to the water, after some time the egg floats. Choose the correct expla

lora16 [44]

Answer:

Explanation:

This happens because adding salt to the water decreases Its density. When the density of the water matches that of the egg, the egg becomes neutrally buoyant and floats.

The weight of the egg becomes equal to the upward buoyant force by the water on to the egg and hence, the egg floats.

5 0

4 years ago

1. What is measurement?

hoa [83]

Answer:

the action of measuring something.

4 0

3 years ago

Suppose a 65 kg person stands at the edge of a 6.5 m diameter merry-go-round turntable that is mounted on frictionless bearings

ozzi

Answer:

$0.3165\ \text{rad/s}$

Explanation:

m = Mass of person = 65 kg

d = Diameter of round table = 6.5 m

r = Radius = $\dfrac{d}{2}=3.25\ \text{m}$

v = Velocity of person running = 3.8 m/s

$I_t$ = Moment of inertia of turntable = $1850\ \text{kg m}^2$

Moment of inertia of the system is

$I=I_t+mr^2\\\Rightarrow I=1850+65\times 3.25^2\\\Rightarrow I=2536.5625\ \text{kg m}^2$

As the angular momentum of the system is conserved we have

$L_i=L_f\\\Rightarrow mvr=I\omega_f\\\Rightarrow \omega_f=\dfrac{mvr}{I}\\\Rightarrow \omega_f=\dfrac{65\times 3.8\times 3.25}{2536.5625}\\\Rightarrow \omega_f=0.3165\ \text{rad/s}$

The angular velocity of the turntable is $0.3165\ \text{rad/s}$ .

3 0

3 years ago

What is the product of mass and velocity called?

Crank

The product of mass and velocity is momentum. P=mv. The 'P' in the equation stands for momentum.

3 0

3 years ago

A resistor and a capacitor are connected in series across an ideal battery having a constant voltage across its terminals. (a) A

mariarad [96]

Answer:

The question is not complete. see the complete question in the explanation section. The correct option is highlighted in bold

Explanation:

(a)A resistor and a capacitor are connected in series across an ideal battery having a constant voltage across its terminals. At the moment contact is made with the battery, the voltage across the resistor is

I. greater than the battery's terminal voltage.

II. equal to the battery's terminal voltage.

III. less than the battery's terminal voltage, but greater than zero.

IV. zero.

Option (i) is not correct as the voltage across the resistor cannot be greater than the terminal voltage since the current is yet to flow through the resistor. Option (ii) is correct as both the resistor voltage and the terminal voltage will just equal at the instance of connection. Option (ii) can only be possible after the current must have passed through the resistor for a while not immediately after contact. Option (iv) is not correct, as this can only be possible is the contact is open.

(b)A resistor and a capacitor are connected in series across an ideal battery having a constant voltage across its terminals. At the moment contact is made with the battery the voltage across the capacitor is

I. greater than the battery's terminal voltage.

II. equal to the battery's terminal voltage.

III. less than the battery's terminal voltage, but greater than zero.

IV. zero.

Option (i) is not correct as the capacitor is yet to charge talk less of the its voltage exceeding that of the battery. Option (ii) can only be correct if the capacitor is fully charged not when it has just been connected. Option (iii) can only occur if the capacitor is discharging. Option (iv) is the correct answer as the capacitor is about to start charging

8 0

4 years ago