The amount of energy needed to change 25 g of −30°C ice into 0°C liquid water is _. A. 9,887.5 J

B. 1,537.5 J

C. 58,037.5 J

D. 8,350 J

Two identical small charged spheres are a certain distance apart, and each one initially experiences an electrostatic force of magnitude f due to the other. with time, charge gradually leaks off of both spheres. when each of the spheres has lost half its initial charge, the magnitude of the electrostatic force will be

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter

Aboat radioed a distress call to a coast guard station. at the time of the call, a vector a from the station to the boat had a magnitude of 45.0 km and was directed 15.0° east of north. a vector from the station to the point where the boat was later found is = 30.0 km, 15.0° north of east. what are the components of the vector from the point where the distress call was made to point where the boat was found? in other words, what are the components of vector c = b - a?