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3 years ago

If element x has 88 protons, how many electrons does it have

Physics

1 answer:

Sergio [31]3 years ago

5 0

Elements have balanced protons and electrons, so the answer is 88.

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The location P(t) of an object moving in the xy-plane at time t seconds is given by the equations P(t)=(x(t),y(t)), where x(t)=a

Nana76 [90]

Answer:

Vx = 6 m / s and .vy = 7 m / s

Explanation:

a) Let's substitute the value of time in the equations

x (1) = a +6

y (1) = b + 7

b) and e) We calculate the position for t = 2 s

x (2) = a +12

y (2) = b +14

We calculate the average speed

v = (x (2) -x (1)) / t2- t1

vₓ = ((a + 12) - (a-6)) / (2-1)

vₓ = 6 m / s

$v_{y}$ = ((b + 14) - (b-7)) / 1

$v_{y}$ = 7 m / s

c) and f) The instantaneous bone change calculates with the derivative

vₓ = dx / dt

vₓ = 6 m / s

That is constant for all time

$v_{y}$ = dy / dt

$v_{y}$ = 7 m / s

d) The speed on the x-axis is constant and is worth vx = 6 m / s

8 0

4 years ago

The CEO, ellen misk, left her martian office but accidentally left a cylindricall can of coke (3.1 inches in diameter, 5.42 inch

iren2701 [21]

Answer:

Specific Gravity = 0.378

Explanation:

First, we will find the force exerted by the can on the table. This force will be equal to the weight of the can:

Pressure = Force/Area = Weight/Area

Weight = Pressure*Area

where,

Area = πdiameter²/4 = π[(3.1 in)(0.0254 m/1 in)]²/4 = 4.8 x 10⁻³ m²

Weight = (510 N/m²)(4.8 x 10⁻³ m²)

Weight = 2.48 N

Now, the weight is given as:

Weight = mg

2.48 N = m(9.8 m/s²)

m = (2.48 N)/(9.8 m/s²)

m = 0.25 kg

Now, we calculate volume of can:

Volume = (Area)(Height) = (4.8 x 10⁻³ m²)(5.42 in)(0.0254 m/1 in)

Volume = 6.6 x 10⁻⁴ m³

Hence, the density of can will be:

Density of Can = m/Volume = 0.25 kg/6.6 x 10⁻⁴ m³

Density of Can = 378.32 kg/m³

So, the specific gravity of Can will be:

Specific Gravity = Density of Can/Density of Water

Specific Gravity = (378.32 kg/m³)/(1000 kg/m³)

<u>Specific Gravity = 0.378</u>

8 0

3 years ago

A lamp is labelled '230 V, 100 W'. How many joules of electrical energy is changed to thermal energy and light if the lamp is sw

viva [34]

Given;

V = 230V

Power, P = 100W

time, t = 2hrs = 7200s

from,

P = IV

and Energy, E= Pt

E = 100*7200

E = 720000 Joules

E = 720KJ

4 0

3 years ago

Read 2 more answers

Is a reflection matter?

azamat

Answer:

Yes, because everything bounce off in every surface around any object.

Explanation:

7 0

3 years ago

A battery of constant voltage is connected to a variable resistor. As the resistance of the resistor increases, what happens to

vova2212 [387]

The electric current amount will vary according to the resistance value when connected to a voltage of a power supply. If resistance is reduced, current will increase. So, if the resistance is infinite (open circuit), the current could be considered zero, or infinitesimal small, if the resistance is zero (of infinitesimal small), the current will tend to be the maximum the power supply can provide. Here is the case of the power supply capability, input resistance, capacity to hold and regulate the output voltage to a certain maximum current, etc. Normally when you short circuit (zero ohms resi

4 0

3 years ago