Which situation is most likely to lead to improving a scientific theory? A. Analyzing the history of how a theory was developed
B. Performing experiments that have never been done before
C. Increasing public awareness of the need for scientific research
D. Gathering scientists for a brainstorming session

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.

Aforce of 34n stretches a very light ideal spring 0.73 m from equilibrium, what is the force constant (spring constant) of the spring? (a) 47n/m (b) 38n/m (c) 53n/m (d) 25n/m

Name three different units of energy used to measure heat and describe what type of situations each is usually used.