A train slow from 36km/hr with a uniform discelleration of 2m/s. How long will it take to reach 18km/hr. Answer in s. I unit

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j ?

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.

Give an example in which the electrical energy changes to light energy