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a year agoNew answer posted
a year agoContributor-Level 10
Ans.2.1
(a) The volume of a cube of side 1 is equal to
The volume of the cube = 1 cm * 1 cm * 1 cm = 1 cm3
1 cm3 = 1 * 10-6 m3
(b) The surface area of a solid cylinder of radius 2.0 cm and height 10.0 cm is equal to1.25 * 104 (mm)2
The surface area of a solid cylinder = 2? r (r+)h, where r = 2.0 cm = 20 mm, h = 10 cm = 100 mmSurface area = 2 * 22/7 * 20 * (100 +20) = 1.51 *
(c) A vehicle moving with a speed of 18 km h–1 covers 5 m in 1 s
Vehicle speed = 18 km/h = 18000/3600 m/s = 5 m/s
(d) The relative density of lead is 11.3. Its density is 11.3 g cm–3 or 11.3 * 103.kg m–3.
Relative density or
New answer posted
a year ago
Contributor-Level 9
Ans.4.1 A scalar quantity depends only on the magnitude – volume, mass, speeds, density, number of moles, angular frequency are all scalar quantities.
A vector quantity depends on magnitude and direction – velocity, acceleration, displacement and angular velocity are all vector quantities.
New answer posted
a year agoContributor-Level 10
The net magnetic flux through any closed surface is zero, according to Gauss's Law for magnetism.
Mathematically,
? B · dA = 0.
It states that all magnetic field lines that enter a surface must exit from it as well. In this way, it is different from the electric charges which can exist independently as positive and negative.
New answer posted
a year agoContributor-Level 10
The Earth's magnetic field makes a magnetic inclination or dip with the horizontal plane at a particular location. It shows how much the magnetic field is tilted from the horizontal. It gets tilted due to the Earth's magnetic nature. The formula is:
tan I = B_V / B_H,
where B_V is the vertical component and B_H is the horizontal component of the Earth's magnetic field.
New answer posted
a year agoContributor-Level 10
The angle between the magnetic north (the direction a compass points) and the geographic north (true north) is the magnetic declination. This angle can change over time due to changes in the Earth's magnetic field and varies with location on Earth. It is important for navigation where accurate directional orientation is crucial, especially in marine and aviation transport. The declination helps in avoiding navigational errors as it ensures that compass readings are corrected.
New answer posted
a year agoContributor-Level 10
The Earth's magnetic field makes a magnetic inclination or dip with the horizontal plane at a particular location. It shows how much the magnetic field is tilted from the horizontal. It gets tilted due to the Earth's magnetic nature. The formula is:
tan I = B_V / B_H,
where B_V is the vertical component and B_H is the horizontal component of the Earth's magnetic field.
New answer posted
a year agoContributor-Level 10
In a magnetic dipole, two equal and opposite magnetic poles are kept at a small distance. In concept, it is equal to an electric dipole. The magnetic dipole moment (M) represents the strength and orientation of the magnetic dipole and it is a vector quantity. The formula is: M = m * 2l. Here m represents the pole strength and 21 shows the distance between the poles. The direction of M is from the south pole to the north pole of the magnet, and its SI unit is A·m².
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