When a boxer is moving away from a punch, the force experienced is reduced because
A) momentum transfer is reduced.
B) the time of contact is increased.
C) the force is less effective.
D) all of the above
Answer: B
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For general projectile motion, when the projectile is at the highest point of its trajectory
A) its acceleration is zero. B) its velocity is perpendicular to the acceleration. C) its velocity and acceleration are both zero. D) the horizontal component of its velocity is zero. E) the horizontal and vertical components of its velocity are zero.
A two-shell-eight-tube-pass heat exchanger condenses 3 kg/s of ammonia at 45ºC using 65 kg/s of water at 20ºC. If the ammonia enters as saturated vapor, leaves as saturated liquid, and has a heat of vaporization of 1078 kJ/kg, determine (a) outlet water temperature and (b) heat exchanger effectiveness.
What will be an ideal response?
The unified model describes active galactic nuclei using
a. a super massive black hole at the center of a normal spiral galaxy. b. a super massive black hole surrounded by an accretion disk and dense disk of gas. c. an accretion disk around a neutron star. d. gravitational lenses to intensify the radiation coming from them. e. different lines of sight toward and dwarf irregular galaxy.
In which general direction should you look to see the Moon rise?
A) north B) south C) east D) west E) It depends on the phase of the Moon.