E.
Solve the following numericals.
1. A wooden box of weight 140 N is kept on a table. The area of cross-section of the box is 5 m2.
Calculate the pressure exerted by the box on the table.
2. A force of 60 N acts on a body having an area of cross-section 5 cm2. Calculate the pressure exerted
by the body.
3. A brick having weight 30 N is 21 cm long, 10 cm wide and 6 cm high. The face of the brick on the
ground having dimensions 21 cm and 6 cm is in contact with the ground. Find the pressure exerted
on the ground by the face of brick.
4. A force of 200 N can produce a pressure of 20000 Pa. Calculate the area in cm2 on which the force
shall act to exert the pressure.
5. Calculate the magnitude of force required in newton to produce a pressure of 28500 Pa on an area
of 100 cm?
6. (a) A boy weighs 50 N. The area of contact of his two feet is 10 cm2. What pressure does he exert
on the ground if he stands on one foot?
(b) A man weighs 250 N. Suppose he stands on a pointed edge with base area 5 cm2. How much
pressure does he exert on the ground?
(c) Now compare (i) and (ii) to find out the following.
(i) Who exerts more force on the ground, the boy in (i) or the man in (ii)?
(ii) Who exerts greater pressure on the ground, the boy or the man?
(iii) Who is likely to sink into the ground, the man standing on a pointed edge or the boy
standing on one foot and why?
7. A force of 250 N, while acting on an area X produces a pressure of 1000 Pa. Calculate the magnitude
of X in cm2
8. The base of a wooden box measures 15 cm x 20 cm. It is placed on a bed. If the weight of the box is
60 N, what is the pressure exerted by the box on the bed?
9. The pressure between a jeep tyre and the road is 100000 Nm-2. If the jeep has a weight of 10000 N,
what is the area of contact between the tyre and the road?
10. Abhinav can open a door by applying a force of 6 N on a 2 m wide door. Find the moment of force
required to open the door.
11. Shiv opens a nut with the help of a spanner of length 30 cm by applying a force of 120 N. Calculate
the moment of force required to open the nut.
12. The moment of force about a fixed end A of a rod AB of length 1.5 m is 60 Nm. What is the force
applied at the free point B of the rod?
Answers
Answer:
The are of cross- section of the box is 5m square. calculate the ... square. calculate the pressure exerted by the box on the table. ... step . formula of pressure = force/ area.
Step-by-step explanation:
hope it helps you
12. The moment of force about a fixed end A of a rod AB of length 1.5 m is 60 Nm. What is the force
applied at the free point B of the rod?
E.
Solve the following numericals.
1. A wooden box of weight 140 N is kept on a table. The area of cross-section of the box is 5 m2.
Calculate the pressure exerted by the box on the table.
2. A force of 60 N acts on a body having an area of cross-section 5 cm2. Calculate the pressure exerted
by the body.
3. A brick having weight 30 N is 21 cm long, 10 cm wide and 6 cm high. The face of the brick on the
ground having dimensions 21 cm and 6 cm is in contact with the ground. Find the pressure exerted
on the ground by the face of brick.
4. A force of 200 N can produce a pressure of 20000 Pa. Calculate the area in cm2 on which the force
shall act to exert the pressure.
5. Calculate the magnitude of force required in newton to produce a pressure of 28500 Pa on an area
of 100 cm?
6. (a) A boy weighs 50 N. The area of contact of his two feet is 10 cm2. What pressure does he exert
on the ground if he stands on one foot?
(b) A man weighs 250 N. Suppose he stands on a pointed edge with base area 5 cm2. How much
pressure does he exert on the ground?
(c) Now compare (i) and (ii) to find out the following.
(i) Who exerts more force on the ground, the boy in (i) or the man in (ii)?
(ii) Who exerts greater pressure on the ground, the boy or the man?
(iii) Who is likely to sink into the ground, the man standing on a pointed edge or the boy
standing on one foot and why?
7. A force of 250 N, while acting on an area X produces a pressure of 1000 Pa. Calculate the magnitude
of X in cm2
8. The base of a wooden box measures 15 cm x 20 cm. It is placed on a bed. If the weight of the box is
60 N, what is the pressure exerted by the box on the bed?
9. The pressure between a jeep tyre and the road is 100000 Nm-2. If the jeep has a weight of 10000 N,
what is the area of contact between the tyre and the road?
10. Abhinav can open a door by applying a force of 6 N on a 2 m wide door. Find the moment of force
required to open the door.
11. Shiv opens a nut with the help of a spanner of length 30 cm by applying a force of 120 N. Calculate
the moment of force required to open the nut.
12. The moment of force about a fixed end A of a rod AB of length 1.5 m is 60 Nm. What is the force
applied at the free point B of the rod?