CLASS 10 CHAPTER 13 SURFACE AREA VOLUME MATHS NCERT SOLUTIONS EX 13.5 EX13.3

 CLASS 10 CHAPTER 13 SURFACE AREA VOLUME MATHS NCERT CBSE SOLUTIONS EX 13.5 EX13.3

 

 

CHAP13_EX13.5_1. A copper wire, 3 mm in diameter, is wound about a cylinder whose length is 12 cm, and diameter 10 cm, so as to cover the curved surface of the cylinder. Find the length and
mass of the wire, assuming the density of copper to be 8.88 g per cm3

CHAP13_EX13.5_3. A cistern, internally measuring 150 cm × 120 cm × 110 cm, has 129600 cm3
 of water in it. Porous bricks are placed in the water until the cistern is full to the brim. Each brick absorbs one-seventeenth of its own volume of water. How many bricks can be put in
without overflowing the water, each brick being 22.5 cm × 7.5 cm × 6.5 cm?

CHAP13_EX13.5_4. In one fortnight of a given month, there was a rainfall of 10 cm in a river valley. If the area of the valley is 7280 km2, show that the total rainfall was approximately equivalent to the addition to the normal water of three rivers each 1072 km long, 75 m wide and 3 m deep.

CHAP13_EX13.3_7.A cylindrical bucket, 32 cm high and with radius of base 18 cm, is filled with sand. This bucket is emptied on the ground and a conical heap of sand is formed. If the height of the conical heap is 24 cm, find the radius and slant height of the heap.

CHAP13_EX13.3_8. Water in a canal, 6 m wide and 1.5 m deep, is flowing with a speed of 10 km/h. How much area will it irrigate in 30 minutes, if 8 cm of standing water is needed?

CHAP13_EX13.3_9. A farmer connects a pipe of internal diameter 20 cm from a canal into a cylindrical tank in her field, which is 10 m in diameter and 2 m deep. If water flows through the pipe at the rate of 3 km/h, in how much time will the tank be filled

CHAP13_EX13.3_Selvi’s house has an overhead tank in the shape of a cylinder. This
is filled by pumping water from a sump (an underground tank) which is in the
shape of a cuboid. The sump has dimensions 1.57 m × 1.44 m × 95cm. The
overhead tank has its radius 60 cm and height 95 cm. Find the height of the water
left in the sump after the overhead tank has been completely filled with water
from the sump which had been full. Compare the capacity of the tank with that of
the sump. (Use π = 3.14

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  NCERT CLASS 11 PHYSICS CHAPTER 15 SOLUTIONS

 

 

 

 

15.14 A wire stretched between two rigid supports vibrates in its fundamental mode with a frequency of 45 Hz. The mass of the wire is 3.5 10-2 kg and its linear mass density is 4.0 10-2 kg m-'. What is (a) the speed of a transverse wave on the string, and (b) the tension in the string?

 15.15 A metre-long tube open at one end, with a movable piston at the other end, shows resonance with a fixed frequency source (a tuning fork of frequency 340 Hz) when the tube length is 25.5 cm or 79.3 cm. Estimate the speed of sound in air at the temperature of the experiment. The edge effects may be neglected.

15.16 A steel rod 100 cm long is clamped at its middle. The fundamental frequency of longitudinal vibrations of the rod are given to be 2.53 kHz. What is the speed of sound in steel?


15.17 A pipe 20 cm long is closed at one end. Which harmonic mode of the pipe is resonantly excited by a 430 Hz source ? Will the same source be in resonance with the pipe if both ends are open? (speed of sound in air is 340 m s-'). 

CLASS 12 NCERT PHYSICS ELECTRICITY

 CLASS 12 NCERT PHYSICS ELECTRICITY