Answer: A
Explanation: Warm fronts cause snow flurries in the winter, while cold fronts cause several days of rainy weather so (C) wouldn’t be it. (D) is to Vague so it doesn’t best describe what occurs in a warm front. Last, (B) is wrong since the weather DOES change in a warm front. That leaves us with (A), so (A) is the correct Answer.
(Hope this helps! )
Answer:
After 80 years there will be 3 g of element X remaining
Explanation:
Given;
the half life of element X = 20 year
initial mass of element X = 48 g
a) How much is there after 80 years
0 year --------------------------> 48 g
20 years -----------------------> (48g / 2) = 24 g
40 years ------------------------> 12 g
60 years ------------------------> 6 g
80 years --------------------------> 3 g
Therefore, after 80 years there will be 3 g of element X remaining.
Answer:
I think it would be exchanging sorry if it's wrong
Answer:
16
Explanation:
solution:
by taking the ratio of the energy E_n,be of the nth orbit of a beryllium atom
Z_be=4 to the energy E_n,h of the nth orbit of a hydrogen (Z_h=1) atom gives
E_n,B/E_n,H=-(2.18*10^-18)*Z^2_BE/-(2.18*10^-18)*Zh^2/n^2
=Z^2_BE+/Z^2_H
=(4)^2/(1)^2
= 16
Answer:
529.92Newton Meters
Explanation:
Work=force x displacement
8books in total
force is 1.8kg
dispplacement is 4.6cm
times both units by 8 and u get
force - 14,4
displacement - 36.8
now times boht together and u get 529.92nm
