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3 years ago

When a calcium atom forms an ion, it loses two electrons. What is the electrical charge of the calcium ion?

Physics

2 answers:

sp2606 [1]3 years ago

8 0

The answer is D. +2 . Hope this helps :D

Svet_ta [14]3 years ago

6 0

The electrical charge is +2 (positive)

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Joe and Bill throw identical balls vertically upward. Joe throws his ball with an initial speed twice as high as Bill. If there

exis [7]

Answer:

the maximum height of Joe's ball will be 4 times Bill's ball.

Explanation:

let bill's velocity be v then Joe's velocity is 2v.

and initial velocities of both bill and Joe are 0

for Bill

$v^2-u^2= 2gh$

$h=\frac{v^2}{2gh}$

for Joe

$(2v)^2-u^2= 2gh'$

$h'=\frac{4v^2}{2g}$

thus we can write that

h'=4h

the maximum height of Joe's ball will be 4 times Bill's ball.

8 0

3 years ago

On a sky coaster (human pendulum) that reaches 10 meters from it's equilibrium position, a man of 120 kg is able to reach a maxi

dimaraw [331]

Answer:

14 m/s

Explanation:

Using the principle of conservation of energy, the potential energy is converted to kinetic energy, assuming any losses.

Kinetic energy is given by ½mv²

Potential energy is given by mgh

Where m is the mass, v is the velocity, g is acceleration due to gravity and h is the height.

Equating kinetic energy to be equal to potential energy then

½mv²=mgh

Making v the subject of the formula

v=√(2gh)

Substituting 9.81 m/s² for g and 10 m for h then

v=√(2*9.81*10)=14.0071410359145 m/s

Rounding off, v is approximately 14 m/s

6 0

4 years ago

PLEASE HELP!!

IrinaK [193]

Answer:

Explanation

i think its a not 100% sure though.

7 0

3 years ago

The inner and outer surfaces of a cell membrane carry a negative and positive charge, respectively. Because of these charges, a

sertanlavr [38]

Answer:

Electric field, E = $6.36\times 10^{6}\ V/m$

Explanation:

Given that,

The potential difference across the membrane, $\Delta V=0.063\ V$

The thickness of the membrane is, $\Delta x=9.9\times 10^{-9}\ m$

We need to find the magnitude of the electric field in the membrane. We know that the relation between electric field and electric potential is given by :

$E=\dfrac{-\Delta V}{\Delta x}\\\\E=\dfrac{0.063\ V}{9.9\times 10^{-9}\ m}\\\\E=6.36\times 10^{6}\ V/m$

So, the magnitude of the electric field in the membrane is $6.36\times 10^{6}\ V/m$ .

7 0

4 years ago

A satellite orbits earth at constant speed in circular orbit.Which statement is correct? A The resultant force on the satellite

inn [45]

Answer:

B The resultant force on the satellite is towards the Earth.

Explanation:

In the case when the satellite orbits earth would be at constant speed in the circular orbit so hee the resultant force that on the satellite would be with regard to the earth

So as per the given situation, the option B is correct

And, the rest of the options would be wrong

And, the same would be relevant

3 0

3 years ago