Advertisements
Advertisements
प्रश्न
The surface area of a solid cylinder of radius 2.0 cm and height 10.0 cm is equal to ______ (mm)2.
उत्तर १
The surface area of a solid cylinder of radius 2.0 cm and height 10.0 cm is equal to 1.5 × 104 (mm)2.
Explanation:
The total surface area of a cylinder of radius r and height h is
S = 2πr (r + h).
Given that,
r = 2 cm = 2 × 1 cm = 2 × 10 mm = 20 mm
h = 10 cm = 10 × 10 mm = 100 mm
∴ S = 2 x 3.14 x 20 x (20+100) = 15072 mm2 = 1.5 × 104 mm2
उत्तर २
Surface area = 2πrh + 2πr2 = 2πr (h + r)
= `2 xx 22/7 xx 2 xx 10 (10 xx 10 + 2 xx 10)` mm2
= 1.5 x 104 mm2 Hence, answer is 1.5 x 104.
APPEARS IN
संबंधित प्रश्न
The volume of a cube of side 1 cm is equal to ______ m3
A famous relation in physics relates ‘moving mass’ m to the ‘rest mass’ m0 of a particle in terms of its speed v and the speed of light, c. (This relation first arose as a consequence of special relativity due to Albert Einstein). A boy recalls the relation almost correctly but forgets where to put the constant c. He writes:
`m = m_0/(1-v^2)^(1/2)`
Guess where to put the missing c.
Fill in the blank by suitable conversion of unit:
G= 6.67 × 10–11 N m2 (kg)–2= ______ (cm)3s–2 g–1
In which of the following systems can scientific data be exchanged between different parts of the world?
Young’s modulus of steel is 1.9 × 1011 N/m2. When expressed in CGS units of dynes/cm2, it will be equal to (1N = 105 dyne, 1m2 = 104 cm2)
Photon is quantum of radiation with energy E = h ν where ν is frequency and h is Planck’s constant. The dimensions of h are the same as that of ______.
- Linear impulse
- Angular impulse
- Linear momentum
- Angular momentum
During a total solar eclipse the moon almost entirely covers the sphere of the sun. Write the relation between the distances and sizes of the sun and moon.
Give an example of a constant which has no unit.
Calculate the solid angle subtended by the periphery of an area of 1 cm2 at a point situated symmetrically at a distance of 5 cm from the area.
A new system of units is proposed in which unit of mass is α kg, unit of length β m and unit of time γ s. How much will 5 J measure in this new system?
