In a two-body collision, if the momentum of the system is conserved, then which of the following best describes the kinetic energy after the collision?
a. must be less
b. must also be conserved
c. may also be conserved
d. is doubled in value
c
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Fluid Flow: A pressurized cylindrical tank, 5.0 m in diameter, contains water that emerges from the pipe at point C with a speed of 84 m/s, as shown in the figure. Point A is 10 m above point B and point C is 3.0 m above point B. The area of the pipe at point B is 0.080 m2 and the pipe narrows to an area of 0.070 m2 at point C. Assume that the water is an ideal fluid in laminar flow. The density of water is 1000 kg/m3. The rate at which the water level is falling in the tank is closest to
A. 300 mm/s. B. 340 mm/s. C. 250 mm/s. D. 210 mm/s. E. 160 mm/s.
A 20.0 kg box slides up a 12.0 m long incline at an angle of 30.0 degrees with the horizontal. A force of 150 N is applied to the box to pull it up the incline. The applied force makes an angle of 10.0 degrees to the incline. What is the change in gravitational potential energy, in Joules?
A. 2,570 B. 2,350 C. 1,450 D. 1,180 E. 945
A wave is described by y = 10 sin (4.0pt – 6.0px). If the equation is in SI units with the units suppressed, what is its frequency?
a. 6.0 Hz c. 3.0 Hz b. 2/3 Hz d. 2.0 Hz
From the discussion in class and the reading for the Thomas Frieden article which of the examples below best describes a default behavior?
What will be an ideal response?