A 1600-kg car travels at a speed of of 12.5 m/s. What is its kinetic energy?

55. Write the shortened notation for the ion symbol next to each element given below. A.) Calcium loses 2 negative electronsB.)

Eddi Din [679]

We are asked to write shortened notation for the ion symbol next to each element given below.

Convention:

First of all, write the shortened notation of the element.

The superscript (at the top) is the number of charges on the ion and also a + sign for a positive ion and - sign for a negative ion.

When an atom loses an electron then the charge is positive (+).

When an atom gains an electron then the charge is negative (-)

A.) Calcium loses 2 negative electrons

Since it loses 2 electrons it will have 2+ superscript.

Calcium has an atomic number of 20 (the number of protons)

$_{20}Ca^{2+}$

B.) Chlorine gains 1 negative electron

Since it gains 1 electron it will have - superscript (we don't write 1 when the charge is 1)

Chlorine has an atomic number of 17 (the number of protons)

$_{17}Cl^-$

C.) Hydrogen gains 1 negative electron

Since it gains 1 electron it will have - superscript

Hydrogen has an atomic number of 1 (the number of protons)

$_1H^-$

6 0

1 year ago

A partition divides an insulated tank into two parts. One part of the tank contains 2.5 kg of compressed liquid water at 60°C an

jeka94

Answer:

$V=0.972m^2$

Explanation:

the energy balance is :

$E_{in} -E_{out} =$ Δ $E_{system}$

0=ΔU= $mm(u_{2} -u_1)$

$u_1=u_2$

the properties of water are from table

$P_1=500 kpa\\T_1=60 degree C\\v_1=v_f_{-->60} =251.6 Kj/Kg$

verified if we get a quantity between 0 and 1

$P_2=10 kpa\\u_2=u_1$

we have,

$v_f=0.001\\v=14.670 m^3/kg\\u_f=191.79\\v_{fg}=2245.4 Kj/Kg\\$

therefore,

$x_2=\frac{u_2-u_f}{u_{fg} }$

we replace the values in this equation:

$x_2=\frac{251.6-191.79}{2245.4}\\ x_2=0.026$

so,

$T_2=T_{sat--10kpa} =45.81\\v_2=v_f-x_2v_{fg}$

we replace the values in this equation:

$v_2=0.38886m^3/kg$

we have,

$V=mv_2$

we replace the values in this equation:

$V=0.972m^2$

6 0

3 years ago

Jupiter's Great Red Spot is

pav-90 [236]

Answer:

2 : A large storm

Explanation: I hope this helps

4 0

2 years ago

The Earth rotates once every day. What is the velocity of a person on its surface, if the radius of Earth is 6 million meters

LekaFEV [45]

Answer:

v = ω R

number of seconds in 24 hrs = 24 * 3600 = 86400 s / da = T (period)

f = 1 / T

ω = 2 Π f = 2 Π / T = 2 Π / 86400

v = 2 Π / 8.64E4 * 6.0E6 = 436 m / s

Check:

S = 2 Π * 6.0E6 = 3.77E7 m/da

S / T = 3.77E7 m/da / 8.64E4 s/da = 436 m / s

3 0

1 year ago

A force acting on a moving ball causes its motion to change. This force stays constant.

sashaice [31]

Answer:

you stop the ball or bring it to a different direction

Explanation:

i don't know if this helps. i didn't take physics yet. but i hope this helps.

8 0

3 years ago