Advertisements
Advertisements
प्रश्न
A hammer exerts a force of 1.5 N on each of the two nails A and B. The area of cross section of tip of nail A is 2 mm2 while that of nail B is 6 mm2. Calculate pressure on each nail in pascal.
Advertisements
उत्तर
Force exerted , F = 1.5 N
Area of cross - section of tip of nail A , a1 = 2 mm2 = `2 xx 10^-6` m2
Area of cross - section of tip of nail B , a1 = 6 mm2 = `6 xx 10^-6 "m"^2`
Pressure on nail A = `"F"/"a"_1 = 1.5/(2 xx 10^-6) = 7.5 xx 10^5` pascal
Pressure on nail B = `"F"/"a"_2 = 1.5/(6 xx 10^-6) = 2.5 xx 10^5` pascal
संबंधित प्रश्न
In which direction does the buoyant force on an object due to a liquid act ?
Which of the following will sink or float on water? (Density of water = 1 g Cm-3)
body C having density 1100 kg m-3
Why does it happen?
A ship dips to a larger depth in fresh water as compared to marine water.
State three factors on which the pressure at a point in a liquid depends.
The diagram below in Fig. 4.12 shows a device which makes the use of the principle of transmission of pressure.
- Name the parts labelled by the letters X and Y.
- Describe what happens to valves A and B and to the quantity of water in the two cylinders when the lever arm is moved down.
- Give reasons for what happens to valves A and B in part (ii).
- What happens when the release valve is opened?
- What happens to valve B in cylinder P when the lever arm is moved up?
- Give a reason for your answer in part (v).
- State one use of the above device.
(i) The diameter of neck and bottom of a bottle are 2 cm and 10 cm, respectively. The bottle is completely filled with oil. If the cork in the neck is pressed in with a force of 1.2 kgf, what force is exerted on the bottom of the bottle?
(ii) Name the law/principle you have used to find the force in part (a).
The base of the cylindrical vessel measures 300 cm2. Water is poured into it up to a depth of 6 cm. Calculate the pressure of water on the base in the vessel.
What do you mean by buoyancy?
State whether true or false. If false, correct the statement.
The weight of fluid displaced determines the buoyant force on an object.
The point at which the force of buoyancy is supposed to act is known as ______.
