Midterms Crossword Puzzle 3

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Across
  1. 2. the ______ velocity of the particle during time increment dt is dr/dt.
  2. 4. A vector always has magnitude and ______
  3. 5. usually referred to as “ω”. (velocity)
  4. 6. this is determined by vector subtraction.
  5. 7. the _______ energy is the energy produced by objects at rest.
  6. 8. represents the rate of change in the position of a particle
  7. 10. the ______ velocity is the time-derivative position v = dr/dt
  8. 13. An object is dropped from 320 m high. Find the time of motion when it hits the ground. (g=10m/s2) ( s )
  9. 14. Alice throws the ball to the +X direction with an initial velocity 10m/s. Time elapsed during the motion is 5s, find the horizontal distance of ball from the origin? ( in meters)
  10. 15. A ball is thrown straight up from the top of a 64 foot tall building with an initial speed of 48 feet per second. The height of the ball as a function of time can be modeled by the function h(t) = –16t2 + 48t + 64. How long will it take for the ball to hit the ground? ( seconds)
Down
  1. 1. in the first-year course, we only need consider circular motion in two dimensions, called _______ motions.
  2. 2. a vector is the time derivative of the velocity vector (second derivative of the position vector)
  3. 3. the ________ planes bisect the mass of the body in three dimensions.
  4. 9. An object hit the ground 530 below the horizontal. Find the initial velocity of the object? ( m/s)
  5. 11. The cannon is 60m above and the initial velocity of the cannonball is25m/s. Find the total time from the given information. (The angle between cannonball and horizontal is 53º and sin53º=0, 8 and cos53º=0, 6) ( in seconds)
  6. 12. An object does free fall motion. It hits the ground after 4 seconds. What can be the height it is thrown? ( in meters)
  7. 14. Ball is thrown horizontally with an initial velocity of 30 m/s. Find the time of motion. (g=10m/s2) ( in seconds)