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Một số bt vật lý tiếng anh !

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Tác giả Chủ đề: Một số bt vật lý tiếng anh !  (Đọc 4319 lần)
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« vào lúc: 09:13:17 PM Ngày 29 Tháng Một, 2013 »

40 câu trong đó mình bí câu  8,10,12,40 và 1 số câu nữa. Một số bài bằng TA muốn giới thiệu cho các bạn

1. a raindrop is falling straight down at 5.14 m/s while a person is moving horizontally at 1.42 m/s. what is the speed of the raindrop with respect to the person, and at what angle is it falling with respect to the person's
2. What is the range of a projectile launched from a level surface at a speed of (91,92) m/s? (g=9.8m/s/s)
3 A vector is 8.46 meters long and @ 60.6 degrees above x-axis, what are the x & y components? x-component Units x-component Unit
4. projectile is launched at an angle of 21 degrees above the horizontal at a speed of 72 m s from a car that is moving to the right along the x axis 78 m s. What is the velocity of the projectile g 9.8m s s x component Units y component Units
8.  A square picture weighing 51 N is suspended in a larger square opening by 3 cables, the top 2 cables run from the upper corners of the picture to the upper corners of the opening @ 45 degrees to the horizontal, the 3rd cable is vertically attached to the bottom of the picture and the bottom of the opening. If the tension on the left cable is 51 N what is the tension (N) in the bottom cable?
9. A person walks a 12.2 m diagonal of a rectangle in 7.84 seconds , assuming 2 sides of the rectangle form the axes and the diagonal is 51 degrees above the x axis. What average speed would a person need to have to walk the sides   arrive in the diagonal corner at the same time
10. If a boat can travel 8.85 m s relative to still water, how long does it take to travel 459 meters against a current of 3.94 m s
11. Add the following 2 vectors  ( 1 , 7 ) and a vector with magnitude 18 making an angle of 10 degrees to the x axis. Find x component , y component
12. A person can swim 0.150 m/s relative to still water. If they are swimming perpendicular to the 0.113 m/s current in a river, what is direction is their motion with respect to the current, and what is their speed with respect to the ground? (x-axis along bank)
13. A person riding in the back of a van traveling @ 64 km/h throws a bottle horizontally out of the open back door of the van @ 20 km/h with respect to the van. How fast is the bottle moving in the horizontal direction of the van from the point of view of someone standing next to the road?
14. A projectile is launched from a horizontal surface at 131 m s and 25 degrees above the surface. How many meters will the projectile travel before reaching it's maximum height   g 9.8m s s
15. A projectile is launched and lands at 258 ft along the x axis and 42ft along the y axis. If it takes 14.2 seconds to do this what is it's average velocity Average x velocity  Units Average y velocity  Units
16. A projectile is launched horizontally from a cliff at 1599 m s  how many meters will it fall after traveling 8 m horizontally   g 9.8 m s s
17. projectile is launched along the +x-axis from a cliff at 1358 m/s, what is it's velocity (m/s) after traveling 28 seconds? (g=9.8m/s/s) x-component Units y-component Units 
18. A particle is moving through the origin, in the x-direction, at 3.36 m/s. It is receiving a constant acceleration of -3.49 m/s/s in the y-direction. Where is the particle 1.66 s later? x-component Units y-component Units 
19. At what speed  m s  does a projectile have to be launched  if it must have a range of 6 meters when launched at an angle of 13 degrees   g 9.8m s s  Units
21. Add the following vectors   (7 , 7  ) &  ( 6 ,9 .)
22. A what velocity must a projectile be launched to reach it's apex 14 m away and 60 m above launch  Enter vx   vy.
23. An object has a velocity of (7.04,28.8) m/s, what is the object's displacement after 5.40 seconds
find
x- component
y-component
24. A projectile is fired from ground level   772 m s   an angle of 58 degrees above horizontal  how high  m  will the projectile go  neglecting air friction
25. A car is traveling to the right along the x-axis @ 54 m/s. A 2nd car is heading the opposite direction @ 13 m/s. What is the speed of the 2nd car from the point of view of the first car.
26. A projectile is launched horizontally from a cliff at 1785 m s  how many meters will it fall and how many meters will it travel horizontally after traveling 4 seconds   g 9.8m s s
. 27 A vector with a y component of 4.21 m makes an angle of 39 degrees with respect to the x axis give the magnitude and the x component.
28 A projectile is launched from a horizontal surface at 116 m s and 30 degrees above the surface. How many meters will the projectile travel before reaching it's maximum height   g 9.8m s s
29 An object travels along the x axis  -42 meters in 6 seconds  and then travels parallel to the y axis  -31 meters in 2 seconds  what is its average speed
30. A square picture weighing 93 N is suspended in a larger square opening by 3 cables, the top 2 cables run from the upper corners of the picture to the upper corners of the opening @ 45 degrees to the horizontal, the 3rd cable is vertically attached to the bottom of the picture and the bottom of the opening. If the tension on the left cable is 93 N what is the tension (N) in the bottom cable?
31 A projectile is launched horizontally from a cliff at 46 m/s, what will it's velocity (m/s) be after traveling horizontally 18 m? (g=9.8m/s/s)
tinh vx&vy?
32. person is riding an elevator down and the elevator is moving   1.64 m s and   31 degrees below the horizontal. If something is falling vertically at 1.42 m s relative to the ground  how fast is it falling vertically relative to the person on the escalator   ignore gravity

33. A projectile is launched at 4.59 m/s at an angle 31 degrees below the horizontal from 6.31 m above the ground. How many seconds before the projectile hits the ground and how many meters did it travel horizontally? (g=9.8m/s/s)
34. For the following vector (9.80,2.52)m give the magnitude and angle from the positive x-axis
35. Add the following 2 vectors: a vector with magnitude 11 making an angle of 61 degrees to the x-axis and a vector with magnitude 11 making an angle of 56 degrees to the x-axis. tim x va y compnent
36. A projectile is launched horizontally and travels 1.79 m before hitting the floor 0.906 m below. How fast was the projectile traveling at launch   g 9.8m s s

37. A raindrop is falling straight down at 6.86 m/s while a person is moving horizontally at 0.578 m/s. What is the speed of the raindrop with respect to the person, and at what angle is it falling with respect to the person's horizontal ?
38. A person is walking at 0.761 m/s on an escalator that is moving at 1.70 m/s. If the escalator is 10 m long, how long is the person on the escalator
39. An object travels along the x axis  18 meters in 2 seconds  and then travels parallel to the y axis 16 meters in 4 seconds  what is its average velocity Vx  m s  Vy  m s
40. An airplane traveling with a horizontal component of 483 mph and it is headed upwards at an angle of 2 degrees  what is it's speed and the vertical component of velocity  mph 


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