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Answer: P = I²R = 3² × 10 = 9 × 10 = 90 W
642
The phenomenon of change in frequency due to relative motion between source and observer is called:
Answer: The apparent change in frequency of a wave due to relative motion between source and observer is the Doppler effect.
Answer: A plane mirror always forms a virtual, erect image of the same size as the object.
Answer: The speed of sound in air at standard temperature and pressure is approximately 340 m/s
Answer: Gravity on the Moon is approximately 1/6 of Earth\'s gravity ≈ 1.6 m/s²
Answer: W = QV = 5 × 10 = 50 J
Answer: Q = mcΔT = 2 × 4200 × 5 = 42000 J
Answer: v = c/n = (3 × 10⁸)/1.5 = 2 × 10⁸ m/s
Answer: The orbital velocity near Earth\'s surface is v = √(gR) ≈ 7.9 km/s
Answer: Charge Q = It, so the SI unit is Coulomb (C)
Answer: Gravitational force is conservative, so work done depends only on the initial and final positions (displacement).
Answer: k = 2π, so λ = 2π/k = 2π/2π = 1 m
Answer: In series, R = R₁ + R₂ = 3 + 6 = 9 Ω
Answer: I = V/R = 12/4 = 3 A
Answer: Power is the rate of doing work, P = W/t
Answer: Impulse = Force × time = N·s, and from momentum change it is also kg·m/s. Both are equivalent.
Answer: Water boils at 100°C (373 K) at standard atmospheric pressure.
Answer: KE = ½mv² = ½ × 1 × 9 = 4.5 J
Answer: The force on a current-carrying conductor in a magnetic field is the principle behind the working of an electric motor.
Answer: During phase change (melting), the temperature remains constant at the melting point.