A 3.0-kg block slides on a frictionless 20° inclined plane. A force of 16 N acting parallel to the incline and up the incline is applied to the block. What is the acceleration of the block?
A. 2.0 m/s2 down the incline
B. 5.3 m/s2 up the incline
C. 2.0 m/s2 up the incline
D. 3.9 m/s2 down the incline
E. 3.9 m/s2 up the incline
Answer: C
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Identical 8.0-mC point charges are positioned on the x axis at x = ±1.0 m and released from rest simultaneously. What is the kinetic energy of either of the charges after it has moved 2.0 m?
a. 84 mJ b. 54 mJ c. 96 mJ d. 63 mJ e. 48 mJ
If 
= 10, 
= 15, and ? = 130°, determine the scalar product of the two vectors shown.
?
?
A. +96
B. ?96
C. +51
D. ?51
E. ?35
About what percent of all asteroids are C-type asteroids?
A) 5% B) 10% C) 15% D) 50% E) 75%
A mild-steel cylindrical billet, 25-cm in diameter, is to be raised to a minimum temperature of 760°C by passing it through a 6-m-long strip type furnace. If the furnace gases are at 1538°C and the overall heat transfer coefficient on the outside of the billet is 68 W/(m2 K), determine the maximum speed at which a continuous billet entering at 204°C can travel through the furnace.
GIVEN
• A mild-steel cylindrical billet is passed through a furnace
• Diameter of billet = 25 cm = 0.25 m
• Billet is to be raised to a minimum temperature of 760°C
• Length of furnace = 6 m
• Temperature of furnace gases (T?) = 1538°C
• The overall heat transfer coefficient h c= 68 W/(m2 K)
• Initial temperature of billet (To) = 204°C
FIND
• The maximum speed at which a continuous billet can travel through the furnace
ASSUMPTIONS
• The heat transfer coefficient is constant
• Billet is 1% carbon steel
• Radial conduction only in the billet, neglect axial conduction
SKETCH
