physics help It is necessary to show clear and complete details of your work. Va

Question

physics help It is necessary to show clear and complete details of your work. Vav = 1/2 ( vo + v ); Deltax = vot + 1/2 at2 ; 1 mile = 5280 ft = 1.609 km a= (V - Vo)/t; V = Deltax/Deltat; theta = tan-1 (Y/x) x = V T; 1 in = 2.54 cm, 1ft = 0.3048 m; g = 9.8 m/s2 Apply strictly the rule for significant figures to evaluate the following Compute A = 1/2 Times h (a + b) a=2.54m h=5.64m b = 3.0m Calculate A = pi Times t2 pi = 3.142 r = 5.1m Calculate V = 1/3 pi h (r2 + r3 + rR ) pi = 3.142 h = 6.3 r = 2.5m R = 4.15 m A motorist travels witha constant speed of 20 m/s for 15s. He then acclerates at 3 m/s2 for 8s to reach his desired top speed. He drives at this speed for 35s and then takes another 18s to bring the car to a full stop. calculate the speed of the car after acclerating for 8 s. calculate the total distance traveled. calculate the average speed for the entire trip. A tourist being chased by an angry bear is running in a straight line towards his car at a speed of 5075 m/s. The car is a distance d away. The bear is 35.6m behind the tourist and running at 7.95 m/s. The tourist reaches the car safely. Calculate the maximum possible distance run by the bear.

Explanation / Answer

1)

a)

A = (1/2)*h*(a+b) = (1/2)*(5.64*(2.54+3.0))

A = 15 m^2

b) A = 3.142*5.1^2 = 82

c)

V = (1/3)*3.142*6.3*(2.5^2+4.15^3+2.5*4.15) = 22 m^3

2)

v = vo + a*t

v = 20+(3*8) = 44 m/s

b)

s = (20*15) + (20*8 + 0.5*3*8^2) + (44*35) +(22*18)

s = 2492 m

c)

Vavg = 2492/(15+8+35+18)
Vavg = 32.8 m/s

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