CH3: 2D motion 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Question #1 π¨ π© πͺ π« What would be the direction of the resultant vector of π΄ + π΅? Solution Answer #1 π¨ πͺ π© π« What would be the direction of the resultant vector of π΄ + π΅? South of East π¨ π© π¨+π© Solution Question #2 A bus is traveling 12.0m/s to the north respect to its road. If your walking to the back of the bus at 1.5m/s, find the velocity of the bus respect to you! Solution Answer #2 A bus is traveling 12.0m/s to the north respect to its road. If your walking to the back of the bus at 1.5m/s, find the velocity of the bus respect to you! 10.5π/π to north or towards you Solution Question #3 If a cannon ball leave the ground at 70.5 m/s 30degrees from the ground (counterclockwise from +x axis), at what speed will this cannon ball come down right before it hits the ground (assume no air resistance and assume same ground level). Solution Answer #3 If a cannon ball leave the ground at 70.5 m/s 30degrees from the ground (counterclockwise from +x axis), at what speed will this cannon ball come down right before it hits the ground (assume no air resistance and assume same ground level). 70.5 π/π the speed will remain but the angle would be 30 degrees clockwise from +x axis. Solution Question #4 What is another way of saying β20π south? Solution Answer #4 What is another way of saying β20π south? Remember conventionally, south/west refer to minus and north/east refer to plus. Solution Question #5 π π₯ π π π¦ π Refer to the triangle above. Find π. Solution Answer #5 π π₯ π π π¦ π Refer to the triangle above. Find π. Ry β1 π = tan Rx Solution Question #6 How would you ad two vectors that are not perpendicular? Solution Answer #6 How would you ad two vectors that are not perpendicular? 1. Resolve both vectors into x and y components 2. Add x components and y components together separately 3. Sum of each is the components of their resultant vector Solution Question #7 Mr. Snug has made a spit ball gun. Solution Answer #7 What two things must be balanced in balancing a redox reaction? Mass and charge Solution Question #8 If π΄ + π΅ equals 0, what does that imply about π΄ and π΅? Solution Answer #8 If π΄ + π΅ equals 0, what does that imply about π΄ and π΅? π΄ = βπ΅ Solution Question #9 What is the importantance of frame of reference? Solution Answer #9 ππ π β ππ2+ ππ + 2π β Zn becomes ππ2+ . This is an example of __________ half-reaction. Oxidation. When a solid metal becomes an ion by losing electrons, itβs oxidation. Solution Question #10 π¨ π© πͺ π« What would be the direction of the resultant vector of πΆ β π·? Solution Answer #10 π¨ πͺ π© π« What would be the direction of the resultant vector of πΆ β π·? πͺ βπ« Solution πΆβπ· Question #11 Mr. Snug is on the roof of a train going eastward at 35.0m/s fighting against ISIS. This ISIS fighter, frightened by Mr. Snugβs Kung Fu moves, runs away westward at 10.0m/s. Mr. Tung got to film this epic battle from a nearby hill. What is the velocity of the ISIS fighter respect to the train? Solution Answer #11 Mr. Snug is on the roof of a train going eastward at 35.0m/s fighting against ISIS. This ISIS fighter, frightened by Mr. Snugβs Kung Fu moves, runs away westward at 10.0m/s. Mr. Tung got to film this epic battle from a nearby hill. What is the velocity of the ISIS fighter respect to the train? 10m/s westward Solution Question #12 To solve a projectile motion problem, one must do what to the vector before you can use it? Solution Answer #12 To solve a projectile motion problem, one must do what to the vector before you can use it? You must resolve the vector into x and y components. HAMMER TIME! Solution Question #13 In projectile motion, an object has constant __________ and constant ________. Solution Answer #13 In projectile motion, an object has constant __________ and constant ________. Horizontal velocity and acceleration Solution Question #14 Mr. Snug starts from origin in a Cartesian plane. First he moves 5m to the right. Then he moves 10m up. After that he moves left 7m and 3m down. Which quadrant is he at? Solution Answer #14 Mr. Snug starts from origin in a Cartesian plane. First he moves 5m to the right. Then he moves 10m up. After that he moves left 7m and 3m down. Which quadrant is he at? x-comp: +5m-7m=-2m Y-comp: +10m-3m=+7m (-, +) so he is at the second quadrant Solution Question #15 Mr. Snug is on the roof of a train going eastward at 35.0m/s fighting against ISIS. This ISIS fighter, frightened by Mr. Snugβs Kung Fu moves, runs away westward at 10.0m/s. Mr. Tung got to film this epic battle from a nearby hill. What is the velocity of the ISIS fighter respect to Mr. Tung? Solution Answer #15 Mr. Snug is on the roof of a train going eastward at 35.0m/s fighting against ISIS. This ISIS fighter, frightened by Mr. Snugβs Kung Fu moves, runs away westward at 10.0m/s. Mr. Tung got to film this epic battle from a nearby hill. What is the velocity of the ISIS fighter respect to Mr. Tung? 25m/s eastward Solution Question #16 An airplane traveling at 100m/s drops a aid kit. After 10s, the aid kit touches the ground. If the plane is at where the red plane is after 10s, where would the package hit the ground? Solution Answer #16 An airplane traveling at 100m/s drops a aid kit. After 10s, the aid kit touches the ground. If the plane is at where the red plane is after 10s, where would the package hit the ground? Solution Question #17 SuperSnug is flying at 500m/s with 25 degrees angle of elevation. What is the xcomponent of his velocity? Solution Answer #17 SuperSnug is flying at 500m/s with 25 degrees angle of elevation. What is the xcomponent of his velocity? π£π₯ = 500cos 25 m/s Solution Question #18 Mr. Snug is on the roof of a train going eastward at 35.0m/s fighting against ISIS. This ISIS fighter, frightened by Mr. Snugβs Kung Fu moves, runs away westward at 10.0m/s respect to the train. Mr. Tung got to film this epic battle from a nearby hill. What is the velocity of the ISIS fighter respect to Mr. Snug (he is not moving)? Solution Answer #18 Mr. Snug is on the roof of a train going eastward at 35.0m/s fighting against ISIS. This ISIS fighter, frightened by Mr. Snugβs Kung Fu moves, runs away westward at 10.0m/s respect to the train. Mr. Tung got to film this epic battle from a nearby hill. What is the velocity of the ISIS fighter respect to Mr. Snug (he is not moving)? 10m/s westward Solution Question #19 What is the velocity of the object at 10s? Solution Answer #19 What is the velocity of the object at 10s? 0m/s *horizontal lines in position vs. time means 0 velocity. Solution Question #20 Which of the position vs time graph best fits in describing freefalling object in a vacuum space? Solution Answer #20 Which of the position vs time graph best fits in describing freefalling object in a vacuum space? Solution Question #21 Solve for βπ‘ when π£π = 0π/π 1 βπ₯ = π£π βπ‘ + πβt 2 2 Solution Answer #21 Solve for βπ‘ when π£π = 0π/π 1 βπ₯ = π£π βπ‘ + πβt 2 2 1 βπ₯ = 0 + πβπ‘ 2 2 2βπ₯ = πβπ‘ 2 2βπ₯ = π Solution βπ‘ 2 Question #22 Find the x-component of the vector given below. π = 30° π = 400π Solution Answer #22 Find the x-component of the vector given below. π = 30° π = 400π ππ₯ = β400 cos 30 m Solution Question #23 Mr. Snug is on an unicycle and traveling at 2.5m/s towards the audience stand A. Mean while he throws a stick that is on fire 2m/s upward respect to him. Which group(s) of people would see the flaming stick travelling in parabolic form? Solution Answer #23 Mr. Snug is on an unicycle and traveling at 2.5m/s towards the audience stand A. Mean while he throws a stick that is on fire 2m/s upward respect to him. Which group(s) of people would see the flaming stick travelling in parabolic form? Stand D and stand C Solution Question #24 Mr. Snug is on the roof of a train going eastward at 35.0m/s fighting against ISIS. This ISIS fighter, frightened by Mr. Snugβs Kung Fu moves, runs away westward at 10.0m/s respect to the train. Mr. Tung got to film this epic battle from a nearby hill. What is the velocity of the Mr. Snug respect to the ISIS fighter? Solution Answer #24 Mr. Snug is on the roof of a train going eastward at 35.0m/s fighting against ISIS. This ISIS fighter, frightened by Mr. Snugβs Kung Fu moves, runs away westward at 10.0m/s respect to the train. Mr. Tung got to film this epic battle from a nearby hill. What is the velocity of the Mr. Snug respect to the ISIS fighter? 10m/s eastward Solution Question #25 Consider the following projectile motion above. If a ball was thrown at 20 degrees above the ground with velocity of 30.0m/s, at which point will the ball have the same velocity as B? Solution Answer #25 Consider the following projectile motion above. If a ball was thrown at 20 degrees above the ground with velocity of 30.0m/s, at which point will the ball have the same velocity as B? D Solution Question #26 Mr. Snug is on the roof of a train going eastward at 35.0m/s fighting against ISIS. This ISIS fighter, frightened by Mr. Snugβs Kung Fu moves, runs away westward at 10.0m/s respect to the train. Mr. Tung got to film this epic battle from a nearby hill. What is the velocity of Mr. Snug respect to Mr. Tung (he is not moving)? Solution Answer #26 Mr. Snug is on the roof of a train going eastward at 35.0m/s fighting against ISIS. This ISIS fighter, frightened by Mr. Snugβs Kung Fu moves, runs away westward at 10.0m/s respect to the train. Mr. Tung got to film this epic battle from a nearby hill. What is the velocity of Mr. Snug respect to Mr. Tung (he is not moving)? 35.0m/s eastward Solution Question #27 Consider this object above. If this object had π£π₯ = 23.4π/π in the beginning at what point would this object be the fastest? Solution Answer #27 Consider this object above. If this object had π£π₯ = 23.4π/π in the beginning at what point would this object be the fastest? D Solution Question #28 Consider this object above. If this object had π£π₯ = 23.4π/π in the beginning what would be the π£π₯ at point C. Solution Answer #28 Consider this object above. If this object had π£π₯ = 23.4π/π in the beginning what would be the π£π₯ at point C. 23.4π/π Solution Question #29 What determines the flight time of an object that is in project motion? Solution - + Answer #29 What determines the flight time of an object that is in project motion? The y-component of initial velocity 2π£π¦,π βπ‘ = a Solution Question #30 Mr. Snug is on an unicycle and traveling at 2.5m/s towards the audience stand A. Mean while he throws a stick that is on fire 2m/s upward respect to him. Respect to Mr. Snug, how is the flaming stick moving? Solution Answer #30 Mr. Snug is on an unicycle and traveling at 2.5m/s towards the audience stand A. Mean while he throws a stick that is on fire 2m/s upward respect to him. Respect to Mr. Snug, how is the flaming stick moving? Goes up and comes back down Solution
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