Tag: science & technology

To convert binary 1101 to decimal, calculate: 1×2³ + 1×2² + 0×2¹ + 1×2⁰ = 8 + 4 + 0 + 1 = 13. The positions represent powers of 2 from left to right (8, 4, 2, 1), so summing the values where there's a 1 gives 13.

BCD does indeed stand for Binary Coded Decimal. It's a encoding scheme where each decimal digit (0-9) is represented by a fixed 4-bit binary code. For example, decimal 7 is 0111 in BCD. This is commonly used in digital systems where decimal arithmetic needs to be performed.

Jupiter's atmosphere is primarily composed of hydrogen (about 90%) and helium (about 10%), similar to the composition of the Sun and the primordial solar nebula. The remaining trace gases include methane, ammonia, water vapor, and other compounds. This composition makes Jupiter a gas giant.

The Foucault pendulum, demonstrated by Léon Foucault in 1851, provides direct visual evidence of Earth's rotation. As the pendulum swings, the plane of oscillation appears to rotate due to Earth's rotation beneath it. This experiment elegantly proves Earth's rotation without relying on astronomical observations.

The Big Bang theory describes the origin of the universe as an expansion from a singularity. Edwin Hubble's observations in the 1920s provided the first evidence that galaxies are moving away from each other, confirming the universe is expanding. This expansion continues today - the universe is not contracting, remaining stable, or pulsating.

A pulsar is a highly magnetized, rotating neutron star that emits beams of electromagnetic radiation from its magnetic poles. As the star rotates, these beams sweep across space like a lighthouse - we detect them as regular pulses. Quasars are active galactic nuclei, not neutron stars.

The gravitational pull of a black hole is so strong that nothing can escape once past the event horizon - not even light or electromagnetic radiation. The escape velocity exceeds the speed of light. Hawking radiation theoretically allows very slow energy loss, but this is negligible - practically, nothing escapes.

Titan is the only moon in our solar system with a substantial atmosphere - mostly nitrogen with methane and ethane. Its atmosphere is denser than Earth's. Tethys and Dione are airless icy moons of Saturn. Huygens was the probe that landed on Titan.