Physics
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New answer posted
a year agoContributor-Level 10
1.1 The world is full of surprises. There are so many things happening with everyone, sometimes it becomes difficult to comprehend by us. But all the things can be explained by basic laws of sciences. Thus the incomprehensible things around us become comprehensible when we look at from scientific viewpoint.
New question posted
a year agoNew answer posted
a year agoContributor-Level 10
2.3
1 Calorie = 4.2 J = 4.2 kgm2s-2
Standard formula for conversion
Given unit / New unit = (M1/M2)x (L1/L2)y (T1/T2)z
Formula for energy = M1L2T-2
Here x = 1, y = 2, z = -2
In this problem
M1 = 1 kg, L1 = 1 m, T1 = 1 s and
M2 =? kg, L2 =? m, T2 =? s
So 1 Calorie = 4.2 (1/? )1 (1/? )2 (1/? )-2
= 4.2? -1? -2? 2
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a year agoNew question posted
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.
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