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  1. D

    Constant Acceleration

    Going Up An elevator cab in a New York hotel has a total run of 185 m. Its maximum speed is 261 m/min. Its acceleration (both speeding up and slowing down) has a magnitude of 1.21 m/s2. (1) How far does the cab move while accelerating to full speed from rest? v = 261m/min = 261m/min *...
  2. D

    Newton's Second Law for a Single Force

    Homework Statement Stopping a Salmon The tension at which a fishing line snaps is commonly called the line's "strength." What minimum strength is needed for a line that is to stop a salmon of weight 85 N in 11.6 cm if the fish is initially drifting at 3.0 m/s? Assume a constant acceleration...
  3. D

    Drag Force and Terminal Speed

    Homework Statement Missile Calculate the drag force on a missile 48 cm in diameter cruising with a speed of 270 m/s at low altitude, where the density of air is 1.2 kg/m3. Assume C = 0.75. Homework Equations Fd = -1/2p(v^2)CA The Attempt at a Solution...
  4. D

    Ideal Projectile Motion , horizontal and vertical components?

    Homework Statement You throw a ball toward a wall with a speed of 32 m/s at an angle of 40.0° above the horizontal directly toward a wall. The wall is 22.0 m from the release point of the ball. (a) How far above the release point does the ball hit the wall? (b) What are the...
  5. D

    Ideal Projectile Motion , horizontal and vertical components

    Homework Statement You throw a ball toward a wall with a speed of 32 m/s at an angle of 40.0° above the horizontal directly toward a wall (Fig. 5-33). The wall is 22.0 m from the release point of the ball. (a) How far above the release point does the ball hit the wall? not sure what...
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    Contact Forces of 3 blocks

    blocks A and B have weights of 45 N and 25 N, respectively. block A is sitting on a table and block B is attached to block A by a peice of string on a frictionless pulley and block B is hanging off the table. also block C is on top of block A Figure 6-48 (a) Determine the...
  7. D

    Applying Newton's Laws Projected Up an Incline

    Projected Up an Incline A block is projected up a frictionless inclined plane with initial speed v1 = 3.43 m/s. The angle of incline is θ = 32.5°. (a) How far up the plane does it go? (b) How long does it take to get there? (c) What is its speed when it gets back to the bottom...
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