Which tools would be necessary to determine whether or not a large block will float, without using water?

1. ruler and balance
2. barometer and flask
3. thermometer and beaker
4. granulated cylinder and tongs

Asmall object with mass 0.200 kg swings back and forth on the lower end of a light rope that is 3.00 m long. the upper end of the rope is attached to the ceiling. as the object swings through its lowest position, where the rope is vertical, the speed of the object is 5.80 m/s. at this point in the motion, what is the tension in the rope? (use g = 9.80 m/s2.)