Suppose an object is moving in a straight line at 50 mi/hr. According to Newton's first law of motion, the object will
A) continue to move in the same way forever, no matter what happens.
B) continue to move in the same way until it is acted upon by a force.
C) continue to move in a straight line forever if it is in space, but fall to the ground if it is on Earth.
D) eventually slow down and come to a stop.
B
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A 1-kg glider and a 2-kg glider both slide toward each other at 1 m/s on an air track. When they collide and stick, the combined-glider speed is
A) 0 m/s. B) 1/2 m/s. C) 1/3 m/s. D) 1/6 m/s. E) 1.5 m/s.
Neutron stars have:
A) very strong bi-polar magnetic fields. B) weak or non-existent magnetic fields. C) periods of days or weeks. D) monopolar fields that switch polarity every rotation. E) no relation to pulsars.
The position of a cart that is oscillating on a spring is given by the equation
x = (12.3 cm) cos[(1.26 s-1)t]. When t = 0.805 s, what are the (a) velocity and (b) acceleration of the cart?
Derive an equation of the form hc = f(T, D, U) for turbulent flow of water through a long tube in the temperature range between 20° and 100°C.
GIVEN
• Turbulent water flow through a long tube
• Water temperature range (Tb) = 20°C to 100°C FIND
• An expression of the form h c= f(T, D, U)
ASSUMPTIONS
• Steady state
• Variation of properties with temperature can be approximated with a power law
• Fully developed flow
• Water is being heated
SKETCH
PROPERTIES AND CONSTANTS
for water
