Question

Part A: The sun produces 3.9 • 1033 ergs of radiant energy per second. How many ergs of radiant energy does the sun produce in 3.25 • 103 seconds? (5 points)

Part B: Which is the more reasonable measurement of the distance between the tracks on a railroad:

1.435 • 10–3 mm or 1.435 • 103 mm? Justify your answer.

Answer 1

part A: just multiply ergs per second * number of seconds

part B: 1.435 * 10^-3 is VERY small so it's not logical; choose the other one

Answer 2

I dont understand

Answer 3

for part A: you are given ergs per second (3.9 • 10^33) and the number of seconds (3.25 • 10^3) just multiply these to get the answer

Answer 4

so 3.9*10^3=3900 and 3.25*10^3=3250 so then 3900*3250. it that right

Answer 5

I think it says 3.9*10^33 not 3.9*10^3 ^^"

Answer 6

(3.9 • 10^33)(3.25 • 10^3) = ?

Answer 7

hint: to multiply 10^33 * 10^3 just add the exponents and raise 10 to that power

Answer 8

Okay.

Answer 9

so then 3.9*10^33=39000 and 3.25*10^33=32500

Answer 10

nope

Answer 11

again, take 10^33 and 10^3

add the exponents together and let me know what you get

Answer 12

cant you just give me the answer pleeeeeeaaaasssseee

Answer 13

the exponents are 33 and 3

add these together.

Answer 14

36

Answer 15

so 10^36

Answer 16

good

now we just multiply the other parts

3.9*3.25 = ?

Answer 17

12.675

Answer 18

good now we can write our answer as

12.675 * 10^36

we can re-write this in scientific notation as

1.2675 * 10^37 ergs = your answer

Answer 19

Thank you so much

Answer 20

and for part B, to reiterate, it would be 1.435 • 10^3 mm b/c the other one is too small to be reasonable

Answer 21

Okay thanks