1. The see-saws below have boxes placed on them that all weigh the same amount. The tick marks are evenly spaced to help measure distance. Add a single box to each see-saw so that it will be in rotational equilibrium. A) B)
Q: What ROTATIONAL concepts are the HARDEST for you to understand and WHY? pls i need a simple anser…
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- A frisbee is moving through the air with a constant angular velocity of 10 cycles/s and a constant center of mass velocity of 20 m/s. Which of the following statements is true. a. The frisbee is not in rotational equilbrium. b. The frisbee is in total equilibrium. c. The frisbee is not in translational equilibrium, and it is not in rotational equilibirum. d. The frisbee is not in translational equilibrium. e. The frisbee is in translational equilibrium, but it is not in rotational equilibirum.1. Calculate the torque about the z-axis pointing out of the page at the origin in the following figure given that F₁ = 2 N, F₂=9N, F3=4 N, F₁=5 N. Hint: Use the sign convention for torques, counter-clockwise rotation corresponds to a torque in the positive z-direction and clockwise rotation corresponds to a torque in the negative z-direction. Which forces produce clockwise rotations and which forces produce counter-clockwise rotations? While using the formula for cross-product AXB=ABsine, remember that is the angle between the tails of the vectors A and B. To determine e rearrange the vectors so that their tails coincide. Nm k net = tu~ 30° F₂ YA 2m 3 m V O 2 m F3 F4 20° ILL XQUESTION 3 While thinking about torques on a balanced a seesaw with two kids sitting at its ends, a student draws the following sketch with equal length arrows representing forces on the seesaw. What wrong with the sketch and how can it be fixed? For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac).
- 3. A rowing machine consists of a solid disk with a radius of 20-cm and a mass of 19-kg. An athlete pulls on the attached cable with a force of 10-Newtons and causes the disk to accelerate. If the disk starts from rest, determine; a. The disk's moment of inertia. b. The magnitude of the torque applied by the athlete. C. The disk's angular acceleration. d. The disk's angular momentum at t = 5.0 sec.7) A light (massless) rod of length L = 1.5 m is freely pivoted at one end. Three forces act as shown in the figure below. The force F3 acts at the midpoint. What is the torque due to each force? Take F1 = 6.90 N, Fz = 4.00 N, F3 = 2.00 N, 0 = 20°, and a = 30° Look at picture draw picture and show all work looking for equationsA wrench exerts a torque of 50 NM on a hexagonal bolt. If the force on the end of the wrench is 50 N and it makes an angle of 45 degrees with respect to the handle, what is the distance or moment arm from the center of the bolt to the point at which the force is applied? A)0.707m B) 0.49m C) 1.41m d)1 m e) none
- 1. A cylinder with rotational inertia /₁ = 2.0 kgm² rotates clockwise about a vertical axis through its center with angular speed w₁ = 5.0 rad/s. A second cylinder with rotational inertia 12= 1.0 kgm² rotates counter-clockwise about the same axis with angular speed w₂=9.0 rad/s. a) Assuming no external torques act on the system of cylinders, if the cylinders couple so they have the same rotational axis, what is the angular speed of the combination? Hint: Pick a direction for the angular momentum. Let counter-clockwise rotation correspond to a positive L and a clockwise rotation correspond to a negative L. rad/s b) What percentage of the kinetic energy is lost during the coupling? KElost W = %13 Which is INCORRECT among the following statements? The counterpart of torque in translational motion is force. The counterpart of work in translational motion is mass. Dynamics for rotational motion is analogous to translational dynamics None of the above1. Calculate the torque about the z-axis pointing out of the page at the origin in the following - figure given that F₁ =3 N, F₂ = 9 N, F3=8 N, F₁=2 N. Hint: Use the sign convention for torques, counter-clockwise rotation corresponds to a torque in the positive z-direction and clockwise rotation corresponds to a torque in the negative z-direction. Which forces produce clockwise rotations and which forces produce counter-clockwise rotations? While using the formula for cross-product A x B= ABsine, remember that is the angle between the tails of the vectors A and B. To determine 0 rearrange the vectors so that their tails coincide. Nm k net = F₂ 30° F3 YA 2 m O 3 m 2 m F4 20° F₁