Question

A cube of side length 10.0 cm and made of unknown material
floats at the surface between water and oil. The oil has a density
of 810 kg/m^{3}. If the cube floats so that it is 72% in
the water and 28% in the oil, what is the mass of the cube and what
is the buoyant force on the cube?

Answer #1

A cube of wood with dimension 20 cm and density 650
kg/m3 floats in water.
a.)What is the distance from the top surface of the cube to the
surface of the water?
b.)How much mass of lead is required to be put on cube so that
the top of the cube is level with the surface of the water?

A wood cube 0.26 m on each side has a density of 730 kg/m3 and
floats levelly in water.
What is the distance from the top of the wood to the water
surface? 7.0 x 10^-2m
What mass has to be placed on top of the wood so that its top is
just at the water level?

A cubical block of wood, 10.2 cm on a side, floats at the
interface between oil and water with its lower surface 1.60 cm
below the interface (the figure (Figure 1) ). The density of the
oil is 790 kg/m3.
A) What is the gauge pressure at the upper face of the
block?
B) What is the gauge pressure at the lower face of the
block?
C) What is the mass of the block?
D) What is the density of...

A uniform, wooden cube with length d = 3.0 cm on each
side has a density r = 500 kg/m3 and floats
motionlessly in water (density 1000 kg/m3). (Take the
acceleration due to gravity to be 9.8 m/s2.) When
pressed down by a small amount, and released, what is the
approximate frequency of the resulting up-and-down
oscillations?

A wood cube 0.28m on each side has a density of 680kg/m3 and
floats levelly in water.
What is the distance from the top of the wood to the water
surface? (in m)
Express your answer using two significant figures
What mass has to be placed on top of the wood so that its top is
just at the water level? (kg)
Express your answer using two significant figures.

A cube of wood having an edge dimension of 18.7 cm and a density
of 645 kg/m3 floats on water. (a) What is the distance from the
horizontal top surface of the cube to the water level? cm (b) What
mass of lead should be placed on the cube so that the top of the
cube will be just level with the water surface?

A cube of wood
having an edge dimension of 20.0 cm
and a density of 650
kg/m3 floats on water.
(a) What is the
distance from the horizontal top surface
of the cube to the
water level? (b) What mass of lead
should be placed on the
cube so that the top of the
cube will just level with
the water surface?

A cube of wood having an edge dimension of 19.7 cm and a density
of 655 kg/m3 floats on water.
(a) What is the distance from the horizontal top surface of the
cube to the water level? __________cm
(b) What mass of lead should be placed on the cube so that the
top of the cube will be just level with the water surface?
____kg

8. A cube of unknown material has sides of length 10.0 cm and a
temperature of 70.0◦C. Treat this object as a perfect emitter. (a)
At what rate does the object radiate heat? (b) If the object is
placed inside a room at room temperature, 22◦C, what is the net
rate of heat radiation of the object with its surroundings?

HURRY! ONLY 40 MINUTES
I have a cube 10 cm on a side. It floats in water with 40% of
its volume above water. What is the density of the cube? Show your
work.

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