One strategy in a snowball fight is to throw a snowball at a high angle over level ground. while your opponent is watching this first snowball, you throw a second snowball at a low angle and time it to arrive at the same time as the first. assume both snowballs are thrown with the same initial speed 29.3 m/s. the first snowball is thrown at an angle of 63◦ above the horizontal. at what angle should you throw the second snowball to make it hit the same point as the first? the acceleration of gravity is 9.8 m/s 2 . answer in units of ◦ .

Classify the following soils according to the uscs classification system. provide appropriate uscs designations. a) this sample of well-graded gravel with sand was obtained from a large earthen dam in vancouver, canada. the sample has 73% fine to coarse sub-angular gravel, 25% fine to coarse sub-angular sand and 2% fines. the maximum size of the particles is 75 mm. the coefficient of curvature is 2.7, while the uniformity coefficient is 12.4. b) this dark brown and wet soil with a “strong organic odor” has 100% passing the no. 200 sieve. the liquid limit of the material is 32% when not dried and is 21% when oven-dried. the plastic index is 21% when not dried. c) this sand has 61% predominantly fine sand, 23% silty fines, and 16% fine sub-rounded gravel size. the maximum size is 20 mm. the liquid limit is 33% and the plastic limit is 27%. d) this soil has 74% fine to coarse sub-angular reddish sand and 26% organic and silty dark brown fines. the liquid limit is 37% when not dried and is 26% when oven dried. the plastic index is 6% when not dried.

Which of the following is not a part of the respiratory system? a. pharynx b. trachea c. pancreas d. larynx

Agas expands from an initial volume of 0.040 m^3 and an initial pressure of 210 kpa to a final volume of 0.065 m^3 while its temperature is kept constant. how much work is done by the system?