Question 1 of 25
4 Points
A koala starts on the ground and climbs a tree to a height of 19 m. If the
koala has a mass of 12 kg, how much gravitational potential energy does it
gain?
O
O
A. 186.23
B. 228 J
O
O
C. 2234 J
D. 2519 J
M
L
he
NA
ICELA
RE
AN
ULE
-
AL
--
SELLE
-
NELLA
STIHL
SA
G

Solution:

Gravitational potential energy (GPE) is given by:

Where,

m is the mass

h is height

g is acceleration due to gravity

From given,

m = 12 kg

h = 19 m

Substituting we get,

Thus the gravitational potential energy gained by the Koala is 2234 J

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6