For an increase in the bulk modulus of a material but without any change in the density, what happens to the speed of sound in that material?

A30 kg weight lies on top of a massless piston of area a = 0.01 m2 the exterior air is at a (constant) p =1 atm and t = 27 c. the interior gas is 0.4 moles of (ideal) n2 and it has initial temperature 27.00 degrees c. 1. what is the initial pressure in the interior? a. 29.4 kpa b. 130.7 kpa c. 101.3 kpa the next three questions concern what happens when an amount of heat q is slowly added to the interior, raising the piston by 1 mm and raising the interior temperature to 27.40 c

Could someone . i have tried to solve myself but my calculation is off

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter