# Exam 1 - Exam1 PointsAwarded PointsMissed Percentage 26.00...

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Exam 1 Points Awarded 26.00 Points Missed 24.00 Percentage 52.0% 1. A projectile fired from a gun has initial horizontal and vertical components of velocity equal to  30 m/s and 40 m/s, respectively. Approximately how long does it take the projectile to reach  the highest point in its trajectory? ANSWER: 4s (+4) V=at or in this case t=V v /g t= 40/9.8= 4.1s 2. Neglecting air resistance, what max height will be reached by an arrow launched straight  upward with an initial speed of 35 m/s? ANSWER 63m (+4) 3. Starting from rest, a particle confined to move along a straight line is accelerated at a rate of  5.0 m/s^2. Which of the following statements accurately describes the motion of this particle?  AN SWER The speed of the particle increases by 5.0 m/s^2 during each second. (+3) Starting from rest, a particel confined to move along a straight line is accelerated at a rate of 5.0m/s(2). Which of the following statements accurately describes the motion of this particle? the speed of the particle increases by 5m/s during each second 4. Three sticks are arranged to form a right triangle. If the lengths of the three sticks are 0.47m, 0.62 m, and 0.78 m, what are the three angles of the triangle? (+3) 0.78m 0.47m - . . = °: °- sin 10 78m0 47m 37 90 °= ° 37 53 90 0.62m 5. An escaped convict runs 1.70km due east of the prison. He then runs north to a friend’s house. If the magnitude of the convict’s total displacement vector is 2.50km, what is the direction of his total displacement vector with respect to due east? (-4) 2.50km - . . = . ° cos 11 70km2 50km 47 2 north of east 1.70km

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My error: I confused tan as adjacent/hypotenuse = - . . = . ° tan 11 70km2 50km 34 2 north of east 6. During football practice, a football is kicked with a speed of 22 m/s at an angle of 60 degrees relative to the positive x direction. At that instant, an observer rides past the football in a car that moves with constant speed of 11 m/s in the positive x direction. Complete the following statement: According to the observer in the
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Exam 1 - Exam1 PointsAwarded PointsMissed Percentage 26.00...

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