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, the drag coefficient of the water droplet is 0.23 and the air density is 
.
and of the air is 
. The pressure above the liquid in the tank is equal to the normal air pressure.
and that of the water is 
.
and 
the density of mercury is 
and that of water is 
.
.
and a larger piston with an area of 
. A force of 
is applied on the smaller piston. With what force does the larger piston act?
lower than the centre of the sphere. The right arm of the manometer is open at the top and the mercury level is 
higher than on the left arm. What is the radius of the reservoir?
and the density of water is 
.
felt by the diver? Note that the air pressure on that day is equal to 99 kPa.
large plate is dropped into a lake. It has a built-in measuring sensor for measuring the force on the entire plate. The plate rests at a depth of 
. What force is detected by the measuring sensor, taking into account that the air pressure at the depth is 
?
.
and a height of 
. What is the pressure at the bottom of the bottle if it is filled to the top with oil and closed with a stopper? Specific weight of oil is 
.
poured to a height of 
. In another tube, however, we have water. How high must the water reach if we want the pressure at the bottom of both tubes to be the same?
.
.
on the brake linings. What is this force?
and 
respectively.
and 
respectively. Round the result to the nearest centimeter.
lies on an inflatable cushion and covers an area of 
. The area of the inflatable cushion opening is one-thousandth that of the flat area covered by the square. How much force do we have to exert on the opening so that air does not escape from the cushion?
is to be lifted with a hydraulic lift. The piston under the crate has an area 
, and on the other side is the piston with the area 
. With at least as much force, you have to press on the smaller piston to lift the crate. How much force is needed? Round the result to one decimal place.
deep glass with an opening of cross-sectional area 
. We then place a light plate on it and turn it over.
, air pressure is 
and gravitational acceleration is 
.
high skyscraper? The density of air at the ground is 
. Assume that at this height difference, the air density does not change significantly.
, and the smaller syringe has a piston with an area 
. The piston of the larger syringe is pressed with a force of 
. What is the least force with which we have to press the piston of the smaller syringe to move the piston of the larger syringe? Round the result to one decimal place.
of an unknown liquid is added to the right arm. This creates a 
difference in the height of mercury between the left and right arm. What is the density of the unknown liquid?
.
.
? The compressibility of aluminum is 
.
can withstand a pressure of 
.
?
water. Answer the questions below.
. If the specific weight of cold air is 
, what could be the maximum total weight of the balloon, basket, and passengers to take off?
and density 
lies in a pool at a depth of 
. Assume that water can seep under the cube.
and a mass of 
. Does the body sink or float on water?
and thickness 
is loaded with a stone. Calculate how much the stone weighs if the board is submerged in water to the top edge after loading it. The specific weight of wood is 
.
. Notice that the fish doesn’t have to wave her fins to stay at the same height.
?
. The body is half immersed in mercury, the other half is above the surface.
?
swims in the Dead Sea, he displaces 
of water. Calculate the specific weight of the water. Round the result to the nearest whole number.
.
of water when floating. How heavy is the log?
of ice. The ice is dropped into the water and it floats in the water.
floats in a lake such that one-quarter of the cube is out of the water. What is the mass of the cube?
. The specific weight of the air is 
and take 
as the average density of the human body.
. Calculate the force with which the anchor rope is tensioned if its mass is 
and its volume is 
.
weighs 
in the air. What force does the force meter show if you hang the ball on it and immerse it completely in water?
and the density of ice is 
).
, acceleration due to gravity = 
)
and the cold air around the balloon has a density of 
. What must be the volume of the balloon in order to float in the air?
and that of water is 
).
, height 
and width 
is placed in the mud at a depth of 
below the surface of a lake, as shown in the figure below. If the density of lead is 
, calculate:
