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clicker5_09

# clicker5_09 - second snowball be thrown to arrive at the...

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1 In-class Quiz #5-1 –Find the Angle The following vectors are added: A =(2,4) and B =(4,2) (this notation simply gives the (x,y) components of the vector) What angle does the resultant make with the x- axis? 1. 0° 2. 30° 3. 45° 4. -30° 5. -45° 1 2 4 4 2 ) tan( = + + = + + = x x y y B A B A θ The red ball and blue ball are both at height 1 m above ground. The red ball is released from rest. The blue ball has initial velocity in the horizontal direction of 1 m/s. Which ball hits the ground first? V = 0 m/s V x = 1 m/s 1m A. red first B. blue first C. same time Assume that both snowballs are thrown with a speed of 25.0 m/s. The first is thrown at an angle of 70.0° with respect to the horizontal. (a) At what angle should the
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Unformatted text preview: second snowball be thrown to arrive at the same point as the first? A. 10.0° B. 20.0° C. 30.0° D. 40.0° E. 50.0° In-class Quiz #5-4 – Rescue! How much time will it take for the parcel to drop from the plane to the ground? A. 2 s B. 5 s C. 10 s D. 12 s E. 20 s 30 m/s 125 m 2 2 1 t a t v y y y + = ∆ 0-125m = ½ (-9.8m/s 2 ) t 2 In-class Quiz #5-5 – Rescue! How far before the plane gets to the hikers does the rescuer need to drop the parcel? A. 180 m B. 150 m C. 120 m D. 100 m E. 50 m 30 m/s 125 m t v x x = ∆ = (30 m/s ) (5 s)...
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