Phys161 HW3 2D Kinematics PDF

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Raluca Teodorescu - Montgomery College Phys 1 HW3 - 2D Kinematics

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1 pt

Due never

1 pt A car starts from rest and travels for 5.17 s with a uniform acceleration of +1.40 m/s2. The driver then applies the brakes, causing a uniform acceleration of -2.03 m/s2. If the brakes are applied for 3.14 s, how fast is the car going at the end of the braking period? (in m/s) 1.

A 4.61 × 10−1

B 5.39 × 10−1

D 7.38 × 10−1

E 8.64 × 10−1

A 3.14 × 101

B 3.55 × 101

D 4.54 × 101

E 5.12 × 101

A B

C 6.31 × 10−1

When the ball reaches the second baseman 0.489 s later, it is caught at point B. How far were you from the second baseman? (in m)

1 pt How far has the car gone? (in m) 2.

Playing shortstop, you pick up a ground ball and throw it to second base. The ball is thrown horizontally, with a speed of 21.6 m/s, directly toward point A, as shown in the figure below.

C 4.01 × 101

6.

A 5.02

C 1.06 × 101

B 7.28 1

D 1.53 × 10

1

E 2.22 × 10

1 pt A soccer ball is kicked with a speed of 9.13 m/s at an angle of 23.5◦ above the horizontal. If the ball lands at the same level from which it was kicked, how long was it in the air? (in s)

(in m)

3.

7.

A 2.37 × 10−1

B 3.15 × 10−1

D 5.58 × 10−1

E 7.42 × 10−1

C 4.20 × 10−1

1 pt A ball is thrown from a point 1.29 m above the ground. The initial velocity is 18.6 m/s at an angle of 27.0◦ above the horizontal. Find the maximum height of the ball above the ground. (in m) 4.

A 1.57

B 2.09

C 2.79

D 3.71

E 4.93

1 pt Calculate the speed of the ball at the highest point in the trajectory. (in m/s) 5.

A 6.79

B 8.49

D 1.33 × 101

E 1.66 × 101

C 1.06 × 101

1 pt What is the distance of vertical drop, AB? A 6.01 × 10−1

B 7.51 × 10−1

D 1.17

E 1.47

C 9.38 × 10−1

Raluca Teodorescu - Montgomery College Phys 1 HW3 - 2D Kinematics

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1 pt The pictures show cannonballs of two different masses projected upward and forward. The cannonballs are projected at various angles above the horizontal, but all are projected with the same horizontal component of velocity.

1 pt How high is the ball when it hits the wall? (in m) 14. A 9.99 × 10−1 D 2.35

B 1.33

C 1.77

E 3.12

1 pt A golf ball is struck with a five iron on level ground. It lands 88.3 m away 4.01 s later. What was the direction of the ball? Give the angle counterclockwise relative to the horizontal. (in deg) Which of the following statements are true about the situations depicted in the figures above?

15. A 1.34 × 101 D 3.14 × 101

B 1.78 × 101

C 2.36 × 101

1

E 4.18 × 10

⊲ The acceleration of the ball in flight is greater in E and F than it is in A and B 8. A True B False 1 pt What was the magnitude of the initial velocity? ⊲ The flight of the ball is identical in pictures A and B, independent of the fact that the masses are different 9. A True B False

(in m/s) 16. A 2.04 × 101

B 2.95 × 101

D 6.21 × 101

E 9.00 × 101

C 4.28 × 101

⊲ The longest horizontal distance traveled is in pictures E and F 10. A True B False ⊲ The highest vertical height reached is in pictures C and D 11. A True B False ⊲ At the top, the horizontal velocity of the cannonball is the same in all cases 12. A True B False

1 pt A rescue plane wants to drop supplies to isolated mountain climbers on a rocky ridge H = 227 m below. If the plane is traveling horizontally with a speed of 217 km/hr (60.3 m/s), how far in advance of the recipients (horizontal distance) must the goods be dropped?

1 pt In a friendly game of handball, you hit the ball essentially at ground level and send it toward the wall with a speed of 11.8 m/s at an angle of 22.4◦ above the horizontal. How long does it take for the ball to reach the wall if it is 4.12 m away? (in s) 13. A 1.93 × 10−1

B 2.42 × 10−1

D 3.78 × 10−1

E 4.72 × 10−1

C 3.02 × 10−1

(in m) 17. A 131 E 410.

B 174

C 232

D 308

Raluca Teodorescu - Montgomery College Phys 1 HW3 - 2D Kinematics

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1 pt Match the verbal description of motion for an object with the corresponding v vs. t graph.

1 pt In the position vs. time graphs above, all times are in seconds and all positions are in meters. Which of the following statements are true about the graphs shown above? Hint: keep in mind that velocity is a vector and speed is a scalar. ⊲ The average velocity is non-zero in Figure F 18. A True B False ⊲ The average velocity is zero in Figures A and B 19. A True B False ⊲ The average velocity is positive in Figure C 20. A True B False ⊲ The net displacement is zero in Figures A and B 21. A True B False ⊲ The object is at rest all of the time in Figure F 22. A True B False 1 pt

Due never A firefighter, 47.1m away from a burning

building, directs a stream of water from a ground level fire hose at an angle of 32.6 deg above the horizontal. If the speed of the stream as it leaves the hose is 39.1 m/s, at what height will the stream of water strike the building? (in m) 23. A 1.26 × 101 D 2.01 × 101

B 1.47 × 101 1

E 2.35 × 10

C 1.72 × 101

⊲ a car is driving along at a constant speed, then decelerates at a constant rate, coming to a stop 24. A 1 B 2 C 3 D 4 E none of the above ⊲ a car is sitting at rest at a red light, then accelerates away when the light turns green 25. A 1 B 2 C 3 D 4 E none of the above ⊲ a car accelerates away from a STOP sign at a constant rate, then decelerates at a constant rate when approaching the next STOP sign 26. A 1 B 2 C 3 D 4 E none of the above ⊲ a car is accelerating at a constant rate, then suddenly crashes into a solid brick wall 27. A 1 B 2 C 3 D 4 E none of the above ⊲ a car is accelerating along the freeway on-ramp, then gets on the freeway and continues at a constant speed 28. A 1 B 2 C 3 D 4 E none of the above

Raluca Teodorescu - Montgomery College Phys 1 HW3 - 2D Kinematics

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1 pt The pictures show cannonballs of two different masses projected upward and forward. The cannonballs are projected at various angles above the horizontal, but all are projected with the same vertical component of velocity.

Which of the following statements are true about the situations depicted in the figures above?

⊲ The time in the air is the same in all cases 29. A True B False ⊲ The longest horizontal distance traveled is the same in all cases 30. A True B False ⊲ The highest vertical height reached is in pictures B and E 31. A True B False ⊲ At the top, the vertical velocity of the cannonball is zero 32. A True B False ⊲ The flight of the ball is identical in pictures A and D, independent of the fact that the masses are different 33. A True B False

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