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- In the figure, what magnitude of force F applied horizontally at the axle of the wheel is necessary to raise the wheel over an obstacle of height h = 0.267 m? The wheel's radius is r = 0.673 m and its mass is m = 1.75 kg. DFCalculate the rotational inertia of a meter stick, with mass 0.67 kg, about an axis perpendicular to the stick and located at the 39 cm mark. (Treat the stick as a thin rod.) X kg · m2A thin cord is wrapped around a uniform grindstone of radius 0.30 m and mass of 25 kg supported by bearings that produce negligible friction torque. The cord exerts a steady tension force on the grindstone, causing it to accelerate from rest to 60 rad/s in 12 s. (lgrindstone = 5 What is the magnitude of the tension force of the cord? O 5.6 N 11.3 N O 18.7 N O 37.5 N
- What is the magnitude force needed to put the object into rotational equilibrium? a) for figure C? b)for figure D? c) for figure E? d)Which of all these figures is in translational equilibrium as well?0 out of 15 p A grindstone has a radius of 13.00 cm and rotates at 13000 rev/min. What is the linear speed (in m/s) of a point on its edge? Selected Answer: O 31.6 Correct Answer: 176.79644 6/170 79644- 182 79644)A metal ball with 0.27 kg of mass and 0.050 m of radius rolled without slipping on a horizontal floor. A ramp was placed on the floor. The ball rolled up the incline without slipping to a vertical height of 0.47 m before stopping. The ramp has a length of 1.7 m along the incline. Find the speed of the ball before it reached the ramp. Hint: the ball has rotational kinetic energy. The rotational inertia of a solid sphere is (2/5)mr^2.
- A fan blade is rotating with a constant angular acceleration of +9.6 rad/s?. At what point on the blade, as measured from the axis of rotation, does the magnitude of the tangential acceleration equal that of the acceleration due to gravity? r = iTo develop muscle tone, a woman lifts a 4.00 kg weight held in her hand. She uses her biceps muscle to flex the lower arm through an angle of 60.0°. (a) What is the angular acceleration (in rad/s2) if the weight is 24.0 cm from the elbow joint, her forearm has a moment of inertia of 0.250 kg · m2, and the net force she exerts is 650 N at an effective perpendicular lever arm of 2.20 cm? (Ignore gravity) (b) How much work (in J) does she do?Jet turbines accelerate from rest to a velocity of 155 rad/s in just 25 seconds. What is their angular acceleration? α = ______ If each turbine has a moment of inertia of 35 kg*m^2, what is net torque required for this acceleration? τ = ______