Help asap Where did the material of the early earth originate?
A . The elements and material of the early earth originates from the death of stars
in the universe.
B . Material came from volcanic explosions on earth.
C . This material originated at the core of the earth.
D . Nuclear fission

An implanted pacemaker supplies the heart with 72 pulses per minute, each pulse providing 6.0 v for 0.65 ms. the resistance of the heart muscle between the pacemaker’s electrodes is 550 ω. find (a) the current that flows during a pulse, (b) the energy delivered in one pulse, and (c) the average power supplied by the pacemaker.

Where is the potential energy throughout the loading, cocking, and releasing of the trebuchet?

Sort the images based on whether there's a force of attraction or repulsion between the magnets shown. attraction repulsion