Anail is magnetized by holding the south pole of a magnet against the head of the nail. does the point of the nail become a north pole or a south pole?

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?

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?

Preciso de ajuda na parte de termometria e tenho prova amanhã ajuda ae prf