Juggles the clown stands on one end of a teeter-totter at rest on the ground. bangles the clown jumps off a platform 2.2 m above the ground and lands on the other end of the teeter-totter, launching juggles into the air. juggles rises to a height of 3.8 m above the ground, at which point he has the same amount of gravitational potential energy as bangles had before he jumped, assuming both potential energies are measured using the ground as the reference level. bangles' mass is 70 kg. what is juggles' mass?

The plum pudding model of the atom state that ?

Electric field of the earth. the earth has a net electric charge that causes a field at points near its surface equal to 150 n> c and directed in toward the center of the earth. (a) what magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earth’s electric field? (b) what would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? is use of the earth’s electric field a feasible means of flight? why or why not?

The atoms in a nickel crystal vibrate as harmonic oscillators with an angular frequency of 2.3 × 1013 rad/s. the mass of a nickel atom is 9.75 × 10-26 kg. what is the difference in energy between adjacent vibrational energy levels of nickel? (h = 6.626 × 10-34 j • s, , 1 ev = 1.60 × 10-19 j)