If the kinetic energy of an object increases, then
A. the speed must increase as well.
B. the total energy must increase.
C. there can only be one force on the object.
D. the potential energy must decrease.
Answer: A
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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
Which of the following processes is involved in the sunspot cycle?
A) a large change in the amount of visible light emitted by the Sun B) an imbalance in the operation of the solar thermostat C) a slight gravitational contraction of the Sun D) small variations in the rate of nuclear energy generation in the solar interior E) the winding of magnetic field lines due to the Sun's rotation
What does cosmological redshift do to light?
A) stretches its wavelength B) makes it slow down C) makes it brighter D) makes all light infrared
Astronaut Rob leaves Earth in a spaceship at a speed of 0.960c relative to an observer on Earth
Rob's destination is a star system 14.4 light-years away (one light-year is the distance light travels in one year). Relative to a frame of reference that is fixed with respect to Earth, how long does it take Rob to complete the trip? A) 14.4 years B) 15.0 years C) 10.8 years D) 4.20 years E) 22.7 years