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A discus thrower accelerates a discus from rest to a speed of 24.9 m/s by whirling it through 1.22 rev. Assume the discus moves on the arc of a circle 1.01 m in radius.
(a) Calculate the final angular speed of the discus.
(b) Determine the magnitude of the angular acceleration of the discus, assuming it to be constant.
(c) Calculate the time interval required for the discus to accelerate from rest to 24.9 m/s.
Basilisk lizards can run across the top of a water surface. With each step, a lizard first slaps its foot against the water and then pushes it down into the water rapidly enough to form an air cavity around the top of the foot.
Two circular metal plates of radius 0.21 m and thickness 8.3 mm are used in a parallel plate capacitor. A gap of 3.9 mm is left between the plates, and half of the space (a semicircle) between the plates is filled with a dielectric for which ? = 10.9..
Consider a weathered rock or soil particle lying on a slope. How would the gravitational force pulling the particle downward along the land surface vary with the inclination of the slope.
A damped mass-spring system oscillates at 280 Hz. The time constant of the system is 2.0 s. At t = 0, the amplitude of oscillation is 8.4 cm and the energy of the oscillating system is then 84 J.
Two light sources are used in a photoelectric experiment to determine the work function for a particular metal surface. Based on this measurement, what is the work function for this metal
A capacitor is connected across an ac generator whose frequency is 751 Hz and whose peak output voltage is 140 V. What is the magnitude of the maximum charge on one plate of the capacitor
An ideal spring with a stiffness of 379N/m is attached to a wall, and its other end is attached to a block that has a mass of 16-kg. The spring/block system is then stretched away from the spring's relaxed position until 59J of mechanical potentia..
Then the driver sees a red light up ahead at next intersection, and starts slowing down at the constant rate. The car stops at the red light, 180 {rm m} from where it was at t = 0.
A camera has a f=50 mm (f=5 cm) lens. A 1.0 mm (0.1cm) tall ant is 200 mm (20 cm) from the lens. Where should the film be placed
How many half-lives are required for the number of radioactive nuclei to decrease to 1/10^5 of the initial number
David is driving a steady 21.0m/s when he passes Tina, who is sitting in her car at rest. How far does Tina drive before passing David
A 111g Frisbee is 25cm in diameter and has half its mass spread uniformly in the disk and the other half concentrated in the rim. What is the Frisbee's rotational inertia
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