A(n) ____________________ telescope has an objective that is a lens
Fill in the blank(s) with correct word
refracting
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Consider a band-saw blade that is to cut steel bar stock. The blade thickness is 2 mm, its height is 20 mm, and it has penetrated the steel workpiece to a depth of 5 mm (see the accompanying sketch). Exposed surfaces of the blade are cooled by an ambient temperature of 20°C through a convection coefficient of 40 W/(m2K). Thermal conductivity of the blade steel is 30 W/(mK). Energy dissipated by the cutting process supplies a heat flux of 104 W/m2 to the surfaces of the blade that are in contact with the workpiece. Assuming two-dimensional, steady conduction, determine the maximum and minimum temperature in the blade cross section. Use a node spacing of 0.5 mm horizontally and 2 mm vertically.
GIVEN
Band saw blade cutting steel bar stock
FIND
(a) Maximum and minimum temperatures in the blade cross section
SKETCH
A 5.0-kg object is pulled along a horizontal surface at a constant speed by a 15-N force acting 20° above the horizontal. How much work is done by this force as the object moves 6.0 m?
a. 78 J b. 82 J c. 85 J d. 74 J e. 43 J
Two flat rectangular mirrors are set edge to edge and placed perpendicular to a flat nonreflecting surface. A light ray that reflects from mirror 1 at angle ?M1 then strikes the second mirror and reflects at ?M2 such that the angle between the ray reaching mirror 1 and the ray leaving mirror 2 is 180°. The angle between the two mirrors is
a. 0°. b. 45°. c. 90°. d. 150°. e. 235°.
One light-minute is the distance light travels in one minute. The speed of light is about 300,000 km/s (3×105 km/s). How far is one light-minute?
A) 300 thousand km (300,000, or 3 × 105 km) B) 9.46 trillion km (9,460,000,000,000, or 9.46 × 1012 km) C) 1.08 billion km (1,080,000,000, or 1.08 × 109 km) D) 18 million km (18,000,000, or 1.8 × 107 km)