Convert a speed of 4.50 km/ h to units of ft/min. (1.00 m = 3.28 ft) 0 E) 886 ft/min Q B) 82.3 /min Q C) 165 ft/min o D) 246 ft/min Q A) 0.246 ft/min Question 3 3 pts You walk 53 m to the north, then turn 60 to your right and walk another 45 m. Determine the direction of your displacement vector. Express your answer as an angle relative to east. ( D) 690 N of E A) 63 N of E O B) 50 N of E O C) 570 N of EQuestion 4 3 pts The position of an object is given by x = at3 - bt2 + ct where a = 4.1 m/s3, b = 2.2 m/s2 and c = 1.7 m/s. and x and tare in SI units. What is the instantaneous acceleration of the object when t = 0.7 s? A) -13 m/$2 O B) 2.9 m/s2 O C) 4.6 m/s2 ( D) 13 m/$2D Question 5 3 pts The coordinate of an object is given as a function of time by x = 7t - 312, where x is in meters and t is in seconds. Its average velocity over the interval from t = O to t = 2 s is: O B) -5 m/s O A) 5 m/s ( D) -11 m/s O C) 11 m/s O E) 1 m/sThis graph shows the position of a particle as a function of time. What is its instantaneous velocity at t = 8.0 s? O A) 3 m/s O B) -3 m/D Question 7 3 pts Each of four particles moves along an X axis. Their coordinates (in meters) as functions of time (in seconds) are given by particle 1: x(t) = 3.5 - 2.713 particle 2: x(t) = 3.5 + 2.73 particle 3: x(t) = 3.5 + 2.72 particle 4: x(t) = 3.5 - 3.4t - 2.72 For which of these particles is the velocity decreasing for t > O? O D) Only 2, 3, and 4 C) Only 2 and 3 O B) Only 1 and 4 O A) All four O E) None of themD Question 8 3 pts A large cannon is red from ground level over level ground at an angle of 30" above the horizontal. The muzzle speed ' 980 m/s. Neglecting air resistance, the II projectile will travel what horizontal distance before striking the ground? Q 043 km 0 Dl85 km A) 4.3 km Q E) 170 km 0 B) 8.5 km D Question 9 3 pts Two projectiles are in ight at the same time. The acceleration of one relative to the other: Q A) is always 9.8 m/s2 Q C) can be horizontal a D) is zero Q E) none of these Q B) can be as large as 19.6 m/52 Question 10 3 pts An electrical motor spins at a constant 2857 rev/min. If the armature radius is 2.685 cm, what is the acceleration of the outer edge of the armature? A) 2403 m/$2 ( B) 844.4 m/$2 ( C) 241,100 m/s2 ( D) 84.40 m/s2Question 1 3 pts What is 56 + (32.00)/(1.2465 + 3.45) written with the correct number of significant figures? O E) 62.8123846 O C) 62.81 ( B) 62.812 O A) 62.8 O D) 63