How many neutrons does element x have if its atomic number is 54 and its mass number is 151?

Explain in physical terms how a microwave oven works. what would happen when you put a conductor in the microwave oven? explain.

Aball has an initial velocity of 3 m/s. if there is no friction, what is the highest it could roll?

Awater balloon launcher uses an elastic band with a spring constant of 115 n/m to use thee launcher you stretch thee band back with a balloon n it the water balloons have a mass of 1.3 kg a) if you stretch the band by 0.8 m, what elastic force will the band exert? b) with the band stretched 0.8 m, how much elastic potential energy is stored in the spring? c) if you release the band, it pushes forward. what is the kinetic energy of the balloon when it reaches the natural length of the band? d) what is the speed of the balloon when it reaches the natural length of the band?