Tag: science & technology

Johnny Blaze is the human identity of the Marvel comic book superhero Ghost Rider. He made a deal with the devil to save his mentor and was bonded with a Spirit of Vengeance. The other options are not comic book superheroes: John Hopkins is a university and namesake, Johnny Walker is a whisky brand, and Matt Demon is a misspelling of actor Matt Damon.

When a ball rotates in a horizontal circle, it has centripetal acceleration directed toward the center, provided by string tension. When the string breaks, this centripetal force vanishes. According to Newton's first law, the object continues in its current velocity direction - the tangent to the circle at the point of release. It does not fly radially outward (a common misconception), as that would require a force in that direction.

First convert speed: 90 km/hr = 25 m/s. Using v² = u² + 2as, the car stops when 0 = 625 - 8s, so total stopping distance = 78.125 m in 6.25 seconds. Time to stop: v = u + at gives 0 = 25 - 4t, so t = 6.25 s. Since the car stops before the 8th second begins, it covers zero distance during that second.

This is total probability theorem. P(Red) = P(choose bag 1) × P(Red|bag 1) + P(choose bag 2) × P(Red|bag 2) = (1/2) × (3/5) + (1/2) × (4/10) = 3/10 + 2/10 = 5/10 = 1/2. Each bag is equally likely to be chosen, then we combine the weighted probabilities.

The sequence 0, 1, 10, 11 represents binary (base-2) counting: 0₂=0, 1₂=1, 10₂=2, 11₂=3. The next number in binary after 11 is 100, which equals 4 in decimal. This is a pattern recognition question testing understanding of number systems.

Wolfram is the German name for tungsten (symbol W), the metal used in incandescent bulb filaments. Tungsten has the highest melting point of all metals (3422°C), allowing it to withstand the high temperatures needed to produce visible light without melting. Carbon and copper are not used for this purpose.

Nitrous oxide (N2O) is commonly called laughing gas because it produces euphoria and giggling when inhaled. It has been used as an anesthetic in dentistry and medicine since the 19th century. The other options are different nitrogen oxides or carbon compounds - nitrogen dioxide (NO2) is a brown toxic gas, nitrogen monoxide (NO) is nitric oxide, and carbon monoxide (CO) is a poisonous gas.

Liquid flow in a pipeline depends on multiple factors including pipe diameter (larger diameter = more flow for given pressure), flow conditions (velocity, pressure, laminar vs turbulent flow), and pipe smoothness (affects friction losses). All three factors work together to determine the actual flow rate, making 'All of the above' the correct answer.