At the maximum height of a projectile launched at an angle to the horizontal, the projectile's velocity is in a ______________ direction
Fill in the blank(s) with correct word
horizontal
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In many metal machining operations (cutting or turning) the contact surface at the interface of the tool and metal part is cooled by a liquid coolant that is delivered on the surface by a single round jet. Water at 25°C is used as coolant in one such jet-cooling system, and it flows at the rate of 0.01 kg/s through a circular nozzle with a diameter of 3.0 mm. Determine the average heat transfer coefficient and the rate of cooling from a 5 mm region on the surface of the part being machined. The surface temperature in this area is at 40°C.
GIVEN
FIND
Average heat transfer coefficient and rate of cooling from a 5 mm region on surface of part being
machined.
The light-gathering power of a telescope varies with the ________ of the diameter of the lens or mirror
Fill in the blank(s) with correct word
A 16.0-kg mass and a 2.25-kg mass are connected by a light string over a massless, frictionless pulley. If g = 9.8 m/s2, what is the acceleration of the system when released?
a. 13.0 m/s2 b. 7.38 m/s2 c. 179 m/s2 d. 9.80 m/s2 e. 1.86 m/s2
A solar cell has a light-gathering area of 10 cm2 and produces 0.2 A at 0.8 V (DC) when illuminated with S = 1 000 W/m2 sunlight. What is the efficiency of the solar cell?
a. 16% b. 7% c. 23% d. 4% e. 32%