BOBOO$dHHHHHHvHh  J  K  P  X  d  e  f  g  s  t                     @LS K_((X.i<5miH niL Physics 1150 Exam #1 September 22, 1995 Name: _______________________ 1. Just as a traffic light turns green, a truck passes through the intersection and continues to move with constant velocity vtrk. At this same time a sports car starts from rest and accelerates with a constant acceleration of acar = 2.2m/s2. Of course the truck leads the sports car at first. But the sports car catches up with the truck and overtakes it in 500 m. Find a) the speed of the truck and b) the speed of the car as it overtakes the truck.2. A 2.5 kg block sits on an inclined plane. The plane is inclined at 20 the the horizontal. The coefficient of friction between the block and the plane is 0.10 (ie,ʵ=0.15). Find the acceleration of the block as it slides down t.he plane.  3. Nissan advertizes that "Our brakes can bring the [300]ZX to a stop from 60 m. p. h. in ... 130 feet." Translated into SI units that means the Nissan 300ZX can brake from about 100km/hr to a stop in about 40 m. a) Find the acceleration, assumed constant, experienced during this braking maneuver. b) If the mass of a 300 ZX is 1200 kg, what is the net force acting on the car? c) During a braking maneuver like this, the net force is the friction force. What must be the minimum coefficient of friction between tires and roadway for this braking to occur as claimed.4. Multiple-guess and true/false section. True / False __ 1. Vectors can be represented on a diagram by an arrow. __2. Vectors can be added exactly like ordinary numbers without regard to directions. __ 3. Scamlars are quantities that can be totally specified without units. __ 4. Speed and acceleration are two words for the same physical quantity. __ 5. Speed is the scalar part or magnitude of velocity which is a vector. Multiple-guess Use E] none of the above as an opition for each question __ 6. A useful and valid equation for understanding straight-line motion with uniform acceleration is A] s = si + vi t + ai t B] s = si + vi t + ai t C] s = si + vi t + ai t2 D] s = si + vi t2 + ai t __ 7. An increasing, positive line on a velocity-time graph means A] the displacement is negative. B] the acceleration is negative. C] the acceleration is positive. D] the velocity is constant. __ 8. An increasing, negative line on a velocity-time graph means A] the displacement is negative. B] the acceleration is negative. C] the acceleration isn positive. D] the velocity is constant. __ 9. If you throw a ball straight up and catch it as it returns, you expect A] the ball will travel faster as you catch it than it did as you threw it. B] the increase in the balls final speed, compared to its initial speed, is proportional to the height attained C] the increase in the balls final speed, compared to its initial speed, is proportional to the time it was in the air D] the ball will be traveling just as fast as when you threw it. __ 10. Projectile motion can be described as A] horizontal and vertical motion, each with constant acceleration of a = 9.8 m/s2. B] horizontal motion with ax = + 9.8 m/s2 and vertical motion with ay = 9.8 m/s2. C] horizontal motion with ax = 0 and vertical motion with ay = 9.8 m/s2. 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