Aconcave mirror has the focal length 30cm . draw a ray diagram to determine the nature and the position of the image formed when the object is beyond 60cm at 45cm

Explain using examples, what is simple harmonic motion and why it is an important area of study in physics.

Which of the following is considered to be a vector?               a.  temperature    b.  velocity    c.  time    d.  mass

Trumpeter a holds a b-flat note on the trumpet for a long time. person c is running towards the trumpeter at a constant velocity. person b is running away from the trumpeter at the same rate. person d is standing still the whole time. which person hears a frequency that is lower than the b-flat?