how can i write this in english?

物理學有好多計算和實驗ga.
There are nothing wrong with all your 3 sentences!

physics has lots of calculation and experiment. (okay)
physics consists lots of calculation and experiment (Good)
physics involves lots of calculation and experiment (Best sentence)
My opinion: physics requires lots of calculation and experiment.

物理學有好多計算和實驗
The physics has a lot of calculations and experiment.

Just my opinion.

Study Physics requires many experiments and calculations.

The study of Physics requries a lot of calculations and experiments.