7. Convert these temperatures between K and °C:
(4 points)
a
)
20 ºC = ? K
b
)
-10 ºC = ? K
c
)
200 K = ? °C
d
)
400 K = ? K
Feedback: To change between K and °C use: °C = K - 273.15 and K = °C + 273.15.
8. Calculate the density of each object in SI units (kg/m³) and determine what material it most likely is using the table in the theory section.
(4 points)
a
)
Earring: mass = 125 g; volume from immersion = 62 mL → 73 mL. Give density in kg/m³ (rounded to nearest integer).
b
)
Earring: Using the density you calculated, what is the most likely material?
c
)
Ball: mass = 240 g; diameter = 8 cm. Give density in kg/m³ (rounded to nearest integer).
d
)
Ball: Using the density you calculated, what is the most likely material?
Feedback: Compute density as \(\rho=m/V\). Compare the result with the densities listed in the theory table to identify the material.