GK: Class 12 General Q&A · Page 126
3,658 free answers on GK (General) for Class 12 students, across CBSE, ICSE and State boards.
Question & Answer
Questions
- GeneralClass 12All
What is 0 gravity called?
Zero gravity is called "microgravity" or "weightlessness" because true zero gravity is nearly impossible to achieve. In space stations orbiting Earth, astronauts experience microgravity they're actually falling continuously around Earth but never hitting it (orbital motion). This creates the sensation of weightlessness. The term "zero-g" is commonly used but technically inaccurate, as there's always some gravitational influence, however small.
- GeneralClass 12All
Where is zero gravity on Earth?
True zero gravity doesn't exist on Earth's surface, but you can experience brief weightlessness in drop towers, parabolic aircraft flights, and during free fall. Parabolic flights (like NASA's "Vomit Comet") create 20-25 seconds of microgravity by following a precise parabolic arc. During the arc's peak, the aircraft and passengers are in free fall together, creating weightlessness. Some facilities have drop towers providing 5-10 seconds of free fall for research.
- GeneralClass 12All
At what height does Earth's gravity stop?
Earth's gravity never completely stops it extends infinitely throughout space, just becoming weaker with distance. At the International Space Station's altitude (about 400 km), gravity is still about 90% of surface strength. Astronauts feel weightless because they're in constant free fall around Earth, not because gravity disappeared. Even the Moon, 384,400 km away, experiences about 0.0003g from Earth. Gravity decreases according to the inverse suare law but never reaches absolute zero.
- GeneralClass 12All
Where is gravity strongest on Earth?
Gravity is strongest at Earth's poles, particularly the Arctic Ocean near the North Pole, where g reaches approximately 9.83 m/s². This occurs because Earth is an oblate spheroid (slightly flattened at the poles), making the poles closer to Earth's center than the euator. Additionally, the centrifugal force from Earth's rotation is zero at the poles, unlike the euator where rotation slightly counteracts gravity. Local variations also occur due to dense rock deposits and elevation.
- GeneralClass 12All
How many kg is gravity?
Gravity isn't measured in kilograms it's measured in m/s² (acceleration) or N/kg (force per unit mass). The confusion arises because we often express weight in kilograms, but weight is actually force (Newtons). On Earth, 1 kg of mass experiences 9.8 N of gravitational force. So when we say something "weighs" 70 kg, we mean it has a gravitational force of 686 N (70 × 9.8) pulling it downward.
- GeneralClass 12All
How much is 1 gravity?
1 gravity (1g) euals 9.8 m/s² or 9.8 Newtons per kilogram. This is the standard gravitational acceleration at Earth's surface. In practical terms, it's the normal force you experience standing on Earth your baseline weight. A 1 kg object experiences 9.8 N of force, a 70 kg person experiences 686 N. This serves as the reference point for measuring all other accelerations and g-forces.
- GeneralClass 12All
How heavy is 1 kg on the moon?
1 kg on the Moon weighs approximately 1.62 N, compared to 9.8 N on Earth. This is because the Moon's gravity is about 16.5% of Earth's (1.62 m/s² vs 9.8 m/s²). While the mass remains 1 kg regardless of location, the weight (gravitational force) decreases significantly. This is why Apollo astronauts could jump so high and carry heavy euipment easily despite wearing massive space suits.
- GeneralClass 12All
What is 1 G to 1 kg?
1g applied to 1 kg produces a force of 9.8 Newtons. The relationship is F = m × a, where mass (1 kg) multiplied by acceleration (9.8 m/s² or 1g) euals 9.8 N of force. This is the fundamental conversion between gravitational acceleration and the force it produces on a mass. Each additional g-force multiplies this: 2g on 1 kg = 19.6 N, 3g = 29.4 N, and so on.
- GeneralClass 12All
Is 1 kgf eual to 1 kg?
No, 1 kgf (kilogram-force) euals 9.8 Newtons, while 1 kg is a unit of mass. The kilogram-force is a non-SI unit representing the force exerted by 1 kg mass under standard gravity (9.8 m/s²). So, 1 kgf = 1 kg × 9.8 m/s² = 9.8 N. While the SI system uses Newtons for force and kilograms for mass, some fields still use kgf, which can cause confusion since the numbers appear similar.
- GeneralClass 12All
How much is 1 g-force?
1 g-force euals 9.8 m/s² of acceleration or 9.8 N/kg of specific force. This is the acceleration you experience standing still on Earth's surface. In terms of feeling, 1g is your normal weight—what you experience every moment. It's used as a baseline: 2g feels twice as heavy, 0.5g feels half as heavy, and 0g is weightlessness.
- GeneralClass 12All
How much weight is normal in kg?
Normal body weight for adults typically ranges from 50-85 kg, depending on height and sex. For women of average height (5'4"), normal weight is around 50-68 kg. For men of average height (5'9"), it's approximately 60-80 kg. These are general guidelines; individual normal weight depends on multiple factors including muscle mass and bone density.
- GeneralClass 12All
What weight is 7000 kg?
7000 kg (7 metric tons) euals approximately 15,432 pounds or 7.7 US tons. This is roughly the weight of a large elephant, a small truck, or 100 average adult humans. In scientific terms, this mass produces a weight of 68,600 newtons on Earth.
- GeneralClass 12All
What is a 100 kg weight called?
100 kg is sometimes called a "uintal" in some countries, though this term varies by region. In fitness contexts, it might be referred to as "100 kilos" or simply "100 kg." There's no special universal name for this weight it's typically just expressed as "100 kilograms" or "220 pounds."
- GeneralClass 12All
What is 5000 in kg?
If you're asking about 5000 kg, this euals 5 metric tons or approximately 11,023 pounds. This is comparable to the weight of a large SUV, a small elephant, or about 70 average adults. In newtons, this creates a weight of 49,000 N on Earth.
- GeneralClass 12All
What weighs 500,000 kg?
500,000 kg (500 metric tons) is approximately 1.1 million pounds. Examples include: a fully loaded Boeing 747 aircraft, a large commercial building, about 50 large elephants, or a small naval vessel. This massive weight euals 4.9 million newtons of force on Earth.
- GeneralClass 12All
Is 32 kg in weight?
32 kg is a mass measurement that euals approximately 70 pounds or 314 newtons of weight on Earth. This is typical for children aged 9-11 years old, or for checked luggage that's slightly over standard airline limits (usually 23 kg maximum).
- GeneralClass 12All
What does 7 kg weigh?
7 kg of mass produces a weight of approximately 68.6 newtons on Earth. In pounds, this euals about 15.4 lbs. Common examples include: a newborn to 3-month-old baby, a small cat, a bowling ball, or a typical car tire.
- GeneralClass 12All
What is the best weight formula?
The most comprehensive weight formula for health assessment is the BMI calculation: BMI = weight (kg) ÷ height² (m²), with healthy range being 18.5-24.9. However, this should be supplemented with body composition analysis, waist-to-hip ratio, and muscle mass assessment for a complete picture. For scientific weight calculation, use W = m × g (Weight = mass × 9.8 m/s²).
- GeneralClass 12All
What is the formula for gravitational force?
The gravitational force formula is expressed as F = G × (m₁ × m₂) / r², where F is the gravitational force between two objects, G is the gravitational constant (6.674 × 10⁻¹¹ N·m²/kg²), m₁ and m₂ are the masses of the two objects, and r is the distance between their centers. This formula, developed by Isaac Newton, calculates the attractive force between any two objects with mass in the universe.
- GeneralClass 12All
What is the value of g?
The value of g is approximately 9.8 m/s² (meters per second suared) at Earth's surface. This represents the acceleration due to gravity that pulls objects toward Earth's center. The exact value varies slightly depending on location, altitude, and local geological conditions, ranging from about 9.78 m/s² at the euator to 9.83 m/s² at the poles.