The drawing shows robin hood about to escape from a dangerous situation. with one hand, he is gripping the rope that holds up a chandelier . when he cuts the rope where it is tied to the floor, the chandelier will fall, and he will be pulled up toward a balcony above. ignore the friction between the rope and the beams over which it slides, and find (a) the acceleration with which robin is pulled upward and (b) the tension in the rope while robin escapes.

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.

Which of the following is the result of the nuclear weak force? the instability of large nuclei the repelling force between positively charged protons the structure of the atom certain types of nuclear decay

For waves in the ocean, the medium of the waves is a. air b. water c. energy d. a passing boat