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in Physics
Answer: R = 2f = 2 × 20 = 40 cm
Answer: P = I²R → 10 = I² × 10 → I² = 1 → I = 1 A
Answer: Three geostationary satellites, spaced 120° apart, can cover most of the Earth\'s surface.
Answer: For an object beyond C in a concave mirror, the image is real, inverted, and diminished.
Answer: In series combination, the same current flows through all resistors.
Answer: For an ideal gas, internal energy is a function of temperature only (U = f(T)).
Answer: Persistence of hearing is approximately 0.1 seconds, which is why we hear continuous sound.
Answer: Frequency is measured in Hertz (Hz), where 1 Hz = 1 cycle per second
Answer: Component along plane = W sin θ = W sin 30° = W × ½ = W/2
Answer: The sky appears blue due to Rayleigh scattering of sunlight by atmospheric molecules, which scatter shorter (blue) wavelengths more.
Answer: Total internal reflection occurs when light travels from a denser to a rarer medium at an angle greater than the critical angle.
Answer: Resultant = √(3²+4²) = 5 N. a = F/m = 5/4 = 1.25 m/s²
Answer: By Archimedes\' principle, buoyant force equals the weight of the fluid displaced by the body.
Answer: Centripetal force is always perpendicular to the velocity, so work = Fd cos 90° = 0
175
The centripetal force on a body of mass 2 kg moving in a circle of radius 4 m with speed 6 m/s is:
Answer: F = mv²/r = 2 × 36/4 = 72/4 = 18 N
Answer: In an adiabatic process, there is no heat exchange (Q = 0) between the system and surroundings.
Answer: η = 1 - T₂/T₁ = 1 - 300/500 = 1 - 0.6 = 0.4 = 40%
Answer: Dipole moment p = q × d, where d is the distance between the charges.
Answer: v = fλ. If λ doubles and f is constant, v also doubles.
Answer: By energy conservation: mgh = ½mv² → v = √(2gh) = √(2×10×3) = √60 m/s