Asteel guitar string with a diameter of 0.300 mm and a length of 70.0 cm is stretched by 0.500 mm while being tuned. how much force is needed to stretch the string by this amount? young's modulus for steel is 2.0 × 1011 n/m2

When a neutral charge, comes into contact with a positive charge they repel each other nothing happens the neutral charge becomes negative they attract each other

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.

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?