A car engine is 30% efficient. If I put 10,000 j worth of petrol into a 1200 kg car what is the maximum speed it could reach.

Your target variable is δf, the magnitude of the difference in frequency between the waves emitted from the sonar device and the waves received by the device after reflecting off the whale. write an expression for δf in terms of the relevant frequencies using the subscript notation introduced above.

Which subatomic particle has a negative charge

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?