11) An airplane is moving at a net force of zero. This means the airplane is
A. slowing down and losing altitude
B. moving at a constant speed and losing attitude
C. slowing down and traveling along a straight line
D. moving at a constant speed and traveling along a straight line

When the velocity of an object is doubled, by what factor is its momentum changed? by what factor is its kinetic energy changed? a) the momentum is zero. b) the momentum is not zero. c) difficult to say.

Ascrew incorporates which other simple machine? lever wheel and axle inclined plane pulley

Africtionless piston-cylinder contains 50 l of saturated liquid r-134a. the piston has a mass and an area resulting in an applied pressure of 500 kpa on the refrigerant. the refrigerant is now heated until its temperature rises to 70∘c. calculate the work (in kj) done during this process.