2. So-called field forces are forces that A. Have no known origin B. Are not rep

Question

2. So-called field forces are forces that A. Have no known origin B. Are not reproducible in the laboratory C. Act at a distance with no apparent contact. D. Act only in a two-dimensional plane. 3. If all forces come in equal and opposite pairs, why is there ever any acceleration? A. The opposing forces act on different objects. B. Field forces are responsible for acceleration. C. Contact forces are responsible for acceleration. D. The opposing forces might be of different types. E. The opposing forces need not be aligned. 4. A small aircraft has a lift-off speed of 35 m/s. What minimum acceleration is needed to be airborne in 210 m? A. Need the time on the runway. B. 5.8 m/s C. 19 m/s. D. 2.9 nis E. 2.0 m/s? 5, What are baryons? A. The carrier bosons of the strong force. B. Particies composcd of a quark and a lepton C. Particles composed of three quarks. D. Particles composed of two quarks

Explanation / Answer

multiple questions allowed to solve only 1 question at a time.So I am solving question 4)

2ad = Vf^2 - Vi^2
a = (Vf^2 - Vi^2)/2d

Convert 35 km/hr to m/s:
(35 km/hr)(1000m/1km)(1hr/3600sec) = 9.7223 m/sec

a = [(9.7223 m/s)^2 - 0^2]/[2(210m)]
a = 0.2250 m/s^2 answer

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