Physics Test VI Chapter 7 Impulse and Momentum

Transcription

1 Physics Test VI Chapter 7 Impulse and Momentum Name: Date: Period: Honor Pledge On my honor as a student I have neither given nor received aid on this test Sign Below HW Grade: Test Grade / Mr. Stark Loudoun County High School Leesburg, Virginia

2 v Equation Help x v v vi + at v a t t 1 x v t at 1 v v a x x ( v + vi ) t i + W mg Gm1m F s µ s FN F G r vl sin θ vl sinθ v l sin θ R t h g g g W Fd cosθ 1 U mgh K mv F t m v P mv ma xa + mb x X cm m + m ' B m m + m B v ω ωi + αt 1 ( ω ω + αθ θ ω + ω i )t i 1 x v i t + at F ma k k FN a b b v F µ W K + U ' W P t m m m + m 1 1 θ ω i t + αt θ ω t αt 11 G B B v N m kg Trigonometry Help r y θ x sin θ y r cos θ x r tan θ y x R x + y

3 Part II Calculations Part II 40 Points 0 1. gol ball strikes a hard smooth loor at an angle o 35.0 and, as the drawing below shows, rebounds at the same angle. The mass o the gol ball is kg, and its speed is 40 m/s just beore and ater striking the loor. What is the magnitude o the impulse applied to the gol ball by the loor? 40 m/s 40 m/s

4 . stream o water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity o m/s while the exciting stream has a velocity o 19.0 m/s. The mass o water that strikes the blade is 5.0 kg/s. Find the magnitude o the average orce exerted on the water by the blade. v i 19.0m / s v 19.0m / s Stationary Turbine Blade

5 kg ball below, moving to the right at a velocity o m/s on a rictionless table, collides head-on with a stationary 8.5-kg ball B. (a) Find the resultant velocities o the balls i the collision is elastic as shown below. B B (b) Find the resultant velocities o the balls i the collision is inelastic as shown below. B B

6 kg bullet is ired straight up at a alling wooden block that has a mass o 3.0-kg as shown below. The bullet has a speed o 800 m/s when it strikes the block. The block originally was dropped rom rest rom the top o a building and had been alling or a time t when the collision with the bullet occurs. s a result o the collision, the block (with the bullet in it) reverses direction, rises, and comes to a momentary halt at the top o the building. Find the time t. 3-kg 800 m/s

7 kg skater is traveling due east at a speed o 4.00 m/s kg skater is moving due south at a speed o 6 m/s. They collide and hold on to each other ater the collision, managing to move o at an angle θ south o east, with a speed o v. (a) Determine the speed v, assuming riction can be ignored. (b) Determine the angle θ o the skater s velocity.

8 Take Home Portion o the Momentum Test Understand that the Honor Pledge still is in eect Name: 1. irework rocket is moving at a speed o 45.0 m/s. The rocket suddenly breaks into two pieces o equal mass. They ly o with velocities v1 and v, as shown in the below drawing. (Ch 7 # ) v v (a) What is the magnitude o v 1? (b) What is the magnitude o v?

9 . The drawing shows a collision between two pucks on an air hockey table. Puck has a mass o kg and is moving along the x axis with a velocity o +5.5 m/s. It makes a collision with puck B, which has a mass o kg and is initially at rest. The collision is not head-on. ter the collision, the two pucks ly apart with the angles shown in the drawing below. (Ch 7 # 3) m/s B o 37 o 65 t rest B (a) What is the inal velocity i puck? (b) What is the inal velocity o puck B?

10 3. mine car, whose mass is 550 kg rolls at a speed o 0.75 m/s on a horizontal track, as the drawing shows. 5-kg chunk o coal has a speed o 0.90 m/s when it leaves the chute as shown below. Determine the velocity o the coal/car system ater the coal has come to a rest in the coal car. (Ch 7 #36) kg 0.90 m/s 0.75 m/s

11 kg person, running horizontally with a velocity o +4.5 m/s, jumps onto a 1.0-kg sled that is initially at rest. (Ch 7 # 37) (a) Ignoring the eects o riction during the collision, ind the velocity o the sled and the person as they move away. (b) The sled and the person coast 35.0 m on a level snow beore coming to a rest. What is the coeicient o kinetic riction between the sled and the snow?

12 kg bullet is ired at 300 m/s into a.5-kg block suspended rom a 1.0-m rope as shown below. What angle theta θ does the rope make when the bulletblock system is at its max height? (Hint: Page 199) θ kg 300 m/s.5-kg