can you help me please

A crane lifts a Metal submarine (density = 2.8 x 103 kg/m3) of mass 20,000 kg. What is the tension in the lifting cable (1) when the submarine is submerged, and (2) when it is entirely out of the water? (1) 2.0 x 105 N (2) 1.7 x 105 N (1) 2.0 x 105 N (2) 2.6 x 103 N (1) 1.3 x 105 N (2) 2.0 x 105 N (1) 1.7 x 105 N (2) 2.0 x 105 NAn object weighs 7.84 N when it is in air and 6.72 N when it is immersed in water. What is the specific gravity of the object? O 7.0 O 6.0 O 8.0 O 9.0The frequency of the third harmonic of an closed pipe is 900 Hz. What is the length of the pipe? 0 1.13 m o 0.283 m o 0.557 m o 0.139 m