For the 1st imagine you can use numbers such as to count the eyes or the legs. The second image you could count how many circles are in the image. The third one you could use numbers to count the wheels.

5 0

3 years ago

Does the atomic number of an atom change?

Ray Of Light [21]

Answer:

An elements atomic number will never change, that is because the atomic number is its "identity."

8 0

3 years ago

You put 330 g of water at 23 ∘C into a 500-W microwave oven and accidentally set the time for 20 min instead of 2.0 min. Part A

frutty [35]

Answer: $47.07g$

Explanation:

500 watts is equivalent to 500J/s

20 minutes is equivalent to 20*60seconds which is 1200 s

330g is equivalent to 330/1000kg which is 0.33kg

The temperature will be (100-23) which is 77°C

The energy will be:

$Energy=500J/s * 1200s$

$Energy=600kJ$

Now we can apply:

Q= $C_{p}$ *m*ΔT

Q=4.186kJ/kgC * 0.33kg * 77°C

Q=106.37kJ

Energy to boil water is 2260J/kg

2260J/kg*0.33=

so The energy available will be:

=745.8kJ-106.37kJ

=639.43kJ

Now the remaining water will be:

=(1-639.43kJ/745.8kJ)*0.33

$=47.07g$

5 0

3 years ago