Aboat has an initial speed of 17 ft/s . it then increases its speed along a circular path of radius rho = 80 ft at the rate of v˙=(1.4s)ft/s2, where s is in feet. determine the time needed for the boat to travel s=70 ft .

If you were designing a bumper for a car, would you prefer it to exhibit elastic or plastic deformation? why? consider the functions of a bumper in both a minor "fender-bender" and a major collision.

The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false

Abrake has a normal braking torque of 2.8 kip in and heat-dissipating cast-iron surfaces whose mass is 40 lbm. suppose a load is brought to rest in 8.0 s from an initial angular speed of 1600 rev/min using the normal braking torque; estimate the temperature rise of the heat dissipating surfaces.