A bobsled has a mass of 1.357 x 10² kg. A constant force is exerted on it for 5.42 s. The sled's initial velocity is zero and its final velocity is 8.73 m/s, east.
a) What is its change in momentum?
b) What is the net force exerted on it?

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

Arod of some material 0.20 m long elongates 0.20 mm on heating from 21 to 120°c. determine the value of the linear coefficient of thermal expansion [in (degrees c)^-1] for this material.

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.