Using g = 10 m/s^2, What is the instantaneous speed for a freely falling object dropped from rest a) At the end of the 7th second of fall? and b) The 10th second?

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain

How can waves travel through ground?

The magnitude of the magnetic field at a certain distance from a long, straight conductor is represented by b. what is the magnitude of the magnetic field at twice the distance from the conductor? a. at twice the distance, the magnitude of the field is 4b.b. at twice the distance, the magnitude of the field is 2b.c. at twice the distance, the magnitude of the field is b/2.d. at twice the distance, the magnitude of the field is b/4.e. at twice the distance, the magnitude of the field remains equal to b.