Question
If sin(3θ) = cos(2θ), find
θ.Solution
We know sin(3θ) = cos(2θ). Using the identity cos(2θ) = sin(90° - 2θ) 3θ = 90° - 2θ Solving 3θ = 90° - 2θ gives 5θ = 90°, so θ = 18°. Answer: a
The half-life of a radioactive substance is 10 days. The time in which only 1/8th of the original substance remains is:
Which of the following phenomena cannot be explained by the wave theory of light?
What is the speed of sound in air at room temperature (20°C)?
A particle is moving in a uniform circular motion with constant speed v along a circle of radius r. The acceleration-of the particle is –
Which of the following quantities is a scalar?
Which of the following correctly ranks molecular speeds at a fixed temperature?
The time period of a second’s pendulum is –
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A train runs along an unbanked circular track of radius of 10 m at speed of 36 km/h. The mass of the train is 16 kg.
What is the an...
In an electric motor, energy is transformed from:
