Advertisements
Advertisements
प्रश्न
State whether pressure is a scalar or vector?
Advertisements
उत्तर
Pressure is a scalar quantity.
APPEARS IN
संबंधित प्रश्न
The buoyant force experienced by a body when floating in saltwater is ....... to or same that of when floating in pure water.
Describe an experiment to determine the density of the material of a coin.
Explain the following statement:
It is easier to cut with a sharp knife than with a blunt one.
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.
Two spheres A and B, each of volume 100 cm3 is placed on water (density = 1.0 g cm−3). The sphere A is made of wood of density 0.3 g cm−3 and sphere B is made of iron of density 8.9 g cm−3.
- Find:
- The weight of each sphere, and
- The upthrust on each sphere.
- Which sphere will float? Give reason.
What is the centre of buoyancy? State its position for a floating body with respect to the centre of gravity of the body.
Select the correct option:
When an object sinks in a liquid, its:
What do you mean by buoyancy?
The center of gravity of the floating body and the center of buoyance are in the same ______ line.
Salt water provides less buoyant force than freshwater.
