I think it is c I'm only in 7th grade but I'm pretty sure that the answer is c
The total positive charge on a copper penny is <u>1.36×10⁵C.</u>
One gram molecular weight of an element contains Avogadro number of independent entities. The atomic weight of Copper is 63.546.
Therefore 63.546 g of Copper contains 6.023×10²³atoms of copper.Calculate the number of atoms N in 3.1 g of copper in the penny.
The atomic number Z of copper is 29. Atomic number is equal to the number of protons present in the nucleus of the atom. Thus, a copper atom has 29 protons. Each proton has a charge e equal to 1.6×10⁻¹⁹C.
Therefore the total charge Q on the penny is given by,
Substitute 2.938×10²²for N, 29 for Z and 1.6×10⁻¹⁹C for e.
The total positive charge on a copper penny is <u>1.36×10⁵C.</u>
Answer:
a) 5m/s2
b) 4 sec
c) 6 sec
d) 90 m
e) Answer in the file attached as it is a graph
Explanation:
This question can be solved using equations of motion. The two equations are:
2(a)(s) = v² – u²
v = u + (a)(t)
a = acceleration
s = distance
v = final velocity
u = initial velocity
t = time
a) Given final velocity = 50m/s and initial velocity = 30 m/s for 160m journey
Using 2(a)(s) = v² - u²
2(a)(160) = 50² – 30²
320 (a) = 2500 - 900
a = 1600/320
a = 5m/s²
b) The acceleration remains constant throughout so we can use it in this part as well.
Using v = u + (a)(t)
50 = 30 + (5)(t)
t = 4 sec
c) The acceleration remains constant throughout so we can use it in this part as well. Now the initial velocity will be 0m/s and final will be 30m/s
Using v = u + (a)(t)
30 = 0 + 5(t)
t = 6 sec
d) The acceleration remains constant throughout so we can use it in this part as well. Now the initial velocity will be 0m/s and final will be 30m/s
Using 2(a)(s) = v² - u²
2(5) (s) = 30² – 0²
10(s) = 900
s = 90 m
e) Graphs are attached as image