A force F=2i+3j acts on a body with a position vector r=5j+2k. what torque acts on the body.​

Trumpeter a holds a b-flat note on the trumpet for a long time. person c is running towards the trumpeter at a constant velocity. person b is running away from the trumpeter at the same rate. person d is standing still the whole time. which person hears a frequency that is lower than the b-flat?

Phase changes are chemical changes. true or false

If a tank filled with water contains a block and the height of the water above point a within the block is 0.8 meter, what is the pressure at point a?