Advertisements
Advertisements
प्रश्न
Multiple Choice Question.
A hydraulic lift is designed to lift heavy objects of maximum mass 2000 kg. The area of cross-section of piston carrying the load is 2.25 × 10-2 m2. What is the maximum pressure the smaller piston would have to bear?
पर्याय
0.8711 × 106 N/m2
0.5862 × 107 N/m2
0.4869 × 105 N/m2
0.3271 × 104 N/m2
Advertisements
उत्तर
0.8711 × 106 N/m2
Explanation:
Apply Newton’s second law of motion to find the force:
F = mg
Substitute the value mass as m = 2000 kg and acceleration due to gravity as g = 9.81 m/s2 to find the force exerted by the piston.
F = mg
F = 2000 kg × 9.81 m/s2
F = 19620 N
Use the law of pressure
p = `F/A`
Substitute the value of force as F = 19620 N, and area as A = 2.25 × 10–2m2 to calculate the maximum pressure the hydraulic lift can bear.
Pmax = `(19620N)/(2.25 xx 10^-2m^2)`
Pmax = 0.8711 × 106Pa
APPEARS IN
संबंधित प्रश्न
Explain why Atmospheric pressure at a height of about 6 km decreases to nearly half of its value at the sea level, though the height of the atmosphere is more than 100 km
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 man exerts same pressure on the ground whether he is standing or he is lying.
Define the term ‘pressure’ and state its unit.
Name two factors on which the pressure on a surface depends.
Why is the bottom part of the foundation of a building made wider?
A normal force of 200 N acts on an area of 0.02 m2. Find the pressure in pascal.
Find the area of a body which experiences a pressure of 50000 Pa by a thrust of 100 N?
A boy weighing 60 kgf stands on platform of dimensions 2.5 cm x 0.5 cm. What pressure in pascal does he exert?
A water tank has four taps fixed at points A, B, C, D as shown in the following figure. The water will flow out at the same pressure from taps at
It is difficult to cut cloth using a pair of scissors with blunt blades. Explain.
The total force exerted by a body normal to the surface is called ______.
If the same force is made to act on a larger area, the pressure ______.
Analogy
Broader straps: ______:: Thin needles: ______.
Explain why the cutting instruments are sharpened.
Why dams are made stronger and thicker at the bottom than at the top?
Why do scuba divers wear a special suit while they go into deep sea levels?
The net force in a particular direction is called ______.
All flowing substances, both liquids, and gases are called ______.
Hot air is ______ dense than ordinary air.
What is the SI unit of pressure?
Assertion (A): Wide wooden sleepers are kept below railway lines to reduce pressure on the railway tracks and prevent them from sinking into the ground.
Reason (R): Pressure is directly proportional to the area in which it is acting.
Pressure is a scalar quantity because ______.
- it is the ratio of force to area and both force and area are vectors.
- it is the ratio of the magnitude of the force to area.
- it is the ratio of the component of the force normal to the area.
- it does not depend on the size of the area chosen.
A vessel filled with water is kept on a weighing pan and the scale adjusted to zero. A block of mass M and density ρ is suspended by a massless spring of spring constant k. This block is submerged inside into the water in the vessel. What is the reading of the scale?
