Asimple watermelon launcher is designed as a spring with a light platform for the watermelon. when an 8.00 kg watermelon is put on the launcher, the launcher spring compresses by 10.0 cm. the watermelon is then pushed down by an additional 30.0 cm and it’s ready to go. just before the launch, how much energy is stored in the spring?

During physical science, ms. greene challenged her students to produce an energy transformation. james and jill wrapped a 4-inch nail with a coil of fifty turns of wire. they connected one end of the coil to one terminal of a knife switch. they connected the other terminal of the knife switch to the battery. finally, they connected the end of the coil to the other terminal of the battery. james held the tip of a 1-inch nail near the flat end of the 4-inch nail. jill closed the knife switch quickly and then opened it. the 1-inch nail was pulled toward the 4-inch nail. what is the best explanation of why the nail moved? a) electrical energy was converted to mechanical energy in the 1-inch nail. b) the 4-inch nail became an electromagnet and the magnetic force attracted the 1-inch nail. c) the electric current in the 4-inch nail was converted to mechanical energy in the 1-inch nail. d) the 4-inch nail had a positive charge and the 1-inch nail had a negative charge. opposites attracted.

Determine the age of a fossil if it had only one eighth of its original carbon-14 content remaining?

The earth exerts a gravitational force of 500 n on amy. what is amy’s mass in kg?