20. a 0.145 kg mass of tungsten at 130.0 °c is placed in a 0.502 kg of water at 22.0 °c. the mixture reaches equilibrium at 28.6 °c. calculate the specific heat of tungsten. (specific heat of water = 4180 j/kg c) givens: unknown: equation: macaδta = - mbcbδtb substitute: solve:

Ajet plane has a sound level of 120 db at a distance of 60 m. what is the q23. sound level at a distance of 6.0 km? (60)2 (6000)? om solution 80db db, hint: 16x assume ultrasound waves travel through the body of an animal at 1540 q24. m/s. if a 30,000 hz signal were reflected off a portion of a heart which was moving toward the source at 3 m/s, what frequency signal would return to the stationary source? solution 30.117hz

The pressure proportional to the area a- inversely b- directly c- increase d-decrease

An electron in an x-ray machine is accelerated through a potential difference of 1.00 × 104 v before it hits the target. what is the kinetic energy of the electron in electron volts?