Which of the following is NOT true about adding animations to your website?
A. You can purchase ready-to-use animated elements from Animation Factory.
B. Restrictions on usage for animated elements vary.
C. Some animations place restrictions on use in commercial websites.
D. When using an open format animation, screen readers and adaptive devices still may require a plug-in.
Answer: D
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Consider the electrical space heater, where the electric resistance heating coil is enclosed in a straight horizontal polished metallic cylinder that has an outer diameter of 1 cm and an emissivity of 0.9. If its surface temperature is at 110°C and the room air temperature is at 20°C, calculate the total heat loss per unit length of the cylinder due to both convection and radiation. For the purpose of this calculation, assume that the reflector is so designed that it “collects” all of the radiant heat from the back half of the horizontal heater and that it reflects 95% of the incident radiation.
GIVEN
• An electric resistance heating coil enclosed in horizontal metallic cylinder.
• Emissivity (?) = 0.9
• Diameter of cylinder (D) = 1 cm= 0.01 m
• Surface temperature (Ts) = 110°C= 383 K
• Ambient air temperature (T?) = 20°C= 293 K
• Reflects 95% of incident radiation.
FIND
Total heat loss per unit length of cylinder due to convection and radiation.
ASSUMPTIONS
• Air is still
• Surface temperature is uniform and constant
PROPERTIES AND CONSTANTS
for dry air at the mean temperature of 65°C
Thermal expansion coefficient (?) = 0.00296 1/K
Thermal conductivity (k) = 0.02825 W/(m K)
Kinematic viscosity (?) = 19.92 × 10–6 m2/s
Prandtl number (Pr) = 0.71
A pilot drops a bomb from a plane flying horizontally at a constant speed. Neglecting air resistance, when the bomb hits the ground the horizontal location of the plane will
A) be behind the bomb. B) be over the bomb. C) be in front of the bomb. D) depend of the speed of the plane when the bomb was released. E) depend of the mass of the bomb when it was released.
A satisfactory model of the transverse strength of uniaxial composite materials is to assume that the fibers are _________in the composite material.
Fill in the blank(s) with the appropriate word(s).
Inelastic Collisions: A 1200-kg car moving at 15.6 m/s suddenly collides with a stationary car of mass 1500 kg. If the two vehicles lock together, what is their combined velocity immediately after the collision?
A. 6.9 m/s B. 8.6 m/s C. 12.1 m/s D. 5.5 m/s