Advertisements
Advertisements
प्रश्न
A man exerts same pressure on the ground whether he is standing or he is lying.
पर्याय
True
False
उत्तर
False.
A man exerts different pressure on the ground whether he is standing or he is lying.
APPEARS IN
संबंधित प्रश्न
A plane is in level flight at a constant speed and each of its two wings has an area of 25 m2. If the speed of the air is 180 km/h over the lower wing and 234 km/h over the upper wing surface, determine the plane’s mass. (Take air density to be 1 kg m–3).
A large He balloon of volume 1425 m3 is used to lift a payload of 400 kg. Assume that the balloon maintains constant radius as it rises. How high does it rise? [Take y0= 8000 m and `rho_"He"`= 0.18 kg m–3].
Pressure is reduced if .................... increases.
Name two factors on which the pressure on a surface depends.
Water flows through a horizontal tube of variable cross section. The area of cross section at A and B are 4 mm2 and 2 mm2 respectively. If 1 cc of water enters per second through A, find (a) the speed of water at A, (b) the speed of water at B and (c) the pressure difference PA − PB.
Match the following.
1. | Density | hρg |
2. | 1 gwt | Milk |
3. | Pascal’s law | `"Mass"/" Volume"` |
4. | Pressure exerted by a fluid | Pressure |
5. | Lactometer | 980 dyne |
It is difficult to cut cloth using a pair of scissors with blunt blades. Explain.
Give reasons why:
cutting edges of knives and axes are sharpened.
The net force in a particular direction is called ______.
Hot air is ______ dense than ordinary air.