50 the emissivity of galvanized steel sheet, a common roofing material, is s = 0.13 at temperatures around 300 k, while its absorptivity for solar irradiation is as = 0.65. would the neighborhood cat be comfortable walking on a roof constructed of the material on a
(
a. if a dryer is designed to operate with an electric power consumption of pelec = 500 w and to heat air from an ambient temperature of ti = 20°c to a discharge temperature of to = 45°c, at what volu- metric flow rate 'e should the fan operate? heat loss from the casing to the ambient air and the surround- ings may be neglected. if the duct has a diameter of d = 70 mm, what is the discharge velocity vo of the air? the density and specific heat of the air may
day when gs = 750 w/m2, t00 = 16°c, and h = 7
w/m2 · k? assume the bottom surface of the steel is
insulated.
be approximated as p = 1.10 kg/m3 and cp
j/kg · k, respectively.

Which statement correctly describes a step-up transformer? a. it increases the amount of electric energy available. b. it increases the voltage of an electric current. c. it changes direct current into alternating current. d. it has more loops of wire in its primary coil.

Time remainin52: 42the chart shows data for a moving object.which conclusion is best supported by the information inthe chart? time (s)velocity (m/s

1. the materials manager for a billiard ball maker must periodically place orders for resin, one of the raw materials used in producing billiard balls. she knows that manufacturing uses resin at a rate of 50 kilograms each day, and that it costs $.04 per day to carry a kilogram of resin in inventory. she also knows that the order costs for resin are $100 per order, and that the lead time for delivery is four (4) days.2. at what point should resin be reordered? a. 0 kilograms remainingb. 50 kilograms remainingc. 200 kilograms remainingd. 400 kilograms remaininge. 500 kilograms remaining3. if order size was 1,000 kilograms of resin, what would be the length of an order cycle? a. 0.05 daysb. 4 daysc. 16 daysd. 20 dayse. 50 days4. if the order size was 1,000 kilograms of resin, what would be the average inventory level? a. 50 kilogramsb. 200 kilogramsc. 500 kilogramsd. 800 kilogramse. 1,000 kilograms5. if the order size was 1,000 kilograms of resin, what would be the daily total inventory costs, excluding the cost of the resin? a. $5b. $10c. $20d. $25e. $40