A 40 cm long metal bar with mass 20 grams is attached to a pivot with a massless string 50 cm long.Find the kinetic energy of the bar when it is rotated at a rate of 4 revolutions per second.stringbarPivot lineergs Note: In the text, all questions use 62.5 pounds/ft as the force per volume density of water.In metric, we would need Newtons/meter. The mass density per volume of water is 1000 kg/m³.To convert this into a force density per volume, we multiply by gravity, approximately 9.8 m/s?. Theresulting quantity is the force density per volume in metric: 9800 N/m³.

Given- Mass of bar m=20 gm=20×10-3 kg Rotation ω=4 rev/s=4×3.14=12.56 rad/s

A 40 cm long metal bar with mass 20 grams is attached to a pivot with a massless string 50 cm long. Find the kinetic energy of the bar when it is rotated at a rate of 4 revolutions per second. string bar Pivot line ergs

A 40 cm long metal bar with mass 20 grams is attached to a pivot with a massless string 50 cm long. Find the kinetic energy of the bar when it is rotated at a rate of 4 revolutions per second. string bar Pivot line ergs

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

See similar textbooks

Similar questions

Circular Motion A 1 Kg bead is confined to move on a vertical circle of radius 2 meters. There is no friction between the bead and the circular track. The bead has a speed of 10 m/s when at the top of the circle at point "A", and the total mechanical energy of the bead is assumed to be constant as it moves around the circle. Assume it takes the bead 0.62 seconds to go counter-clockwise from point "A" to point "B" each cycle. 10 m/s 2 m Previous A 30° Note: vector directions should be given as the "standard" angle with 0 ≤0 < 360 degrees Calculate the direction of the velocity of the bead at point "B". Enter the standard angle in degrees.
4. A large block with a mass of 8.5 kg slides along a horizontal surface without friction. The block runs into a horizontal spring with a spring constant of 260 N/m and compresses the spring by 50 cm before coming to a stop. How fast is the block moving when it just hit the spring? What is the potential energy of the spring, the kinetic energy of the block, and the total mechanical energy of the system when the block is halfway to its stopping position? That is, find these quantities when the block is at 25 cm and still moving.
A 34.5-kg child is on a swing attached to ropes that are L = 1.29 m long. Take the zero of the gravitational potential energy to be at the position of the child when the ropes are horizontal. a) Determine the child's gravitational potential energy when the child is at the lowest point of the circular trajectory. -436.6 J You are correct. Your receipt no. is 157-4178 ? Previous Tries b) Determine the child's gravitational potential energy when the ropes make an angle of 45.0° relative to the vertical. 312.84 J Submit Answer Incorrect. Tries 7/99 Previous Tries
4. Two wheels (A and B) of equal mass and the same Iz roll down a hill without sliding and have the same kinetic energy. Partway down the hill, wheel B stops rolling and continues down the hill sliding (no rotation), but maintains the same kinetic energy as wheel A which continues to roll without sliding. Which wheel reaches the base of the hill first (assuming they travel the same path length)? wheel A (the one that rolls the whole way) wheel B (the one that starts sliding) they reach the hill base at the same time
A 3 kg ball is located of top of a hill that is 1000 m high. The ball starts rolling from rest. Answer the following: Assume g= 9.81 m/ s² and there is no friction. A) Calculate the initial potential energy. B) Calculate the initial kinetic energy. C) Calculate the final kinetic energy if the ball reaches a final height of 250 m. D) Calculate the final speed of the ball.
Circular Motion A 1 Kg bead is confined to move on a vertical circle of radius 2 meters. There is no friction between the bead and the circular track. The bead has a speed of 10 m/s when at the top of the circle at point "A", and the total mechanical energy of the bead is assumed to be constant as it moves around the circle. Assume it takes the bead 0.62 seconds to go counter-clockwise from point "A" to point "B" each cycle. 10 m/s 2 m 30° Note: vector directions should be given as the "standard" angle with 0≤0 < 360 degrees Calculate the average speed (m/s) from "A" to "B" (based on the 0.62 seconds mentioned in the description).
A system of two paint buckets connected by a lightweight rope is released from rest with the 12.0 kg bucket 2.0 m above the floor as shown in figure below. Use the principle of conservation of energy to find the speed with which this bucket strikes the floor. You can ignore friction and the mass of the pulley. ed 10.00 120kg 20m 40kg a. 2.43 ms-! b. 9.8 ms- 5.0ms-! d. none of the above
(8c7p50) A 0.45 kg mass sliding on a horizontal frictionless surface is attached to one end of a horizontal spring (with k = 725 N/m) whose other end is fixed. The mass has a kinetic energy of 12.0 J as it passes through its equilibrium position (the point at which the spring force is zero). At what rate is the spring doing work on the mass as the mass passes through its equilibrium position? Submit Answer Tries 0/5 At what rate is the spring doing work on the mass when the spring is compressed 0.091 m and the mass is moving away from the equilibrium position? Submit Answer Tries 0/5 This discUSsion is closod Send Feedbac
A winch motor generates 500 W and uses it to pull a 250 kg crate across a horizontal floor. The crate starts from rest and the winch is applied for 5 seconds. The final speed of the crate is
A spherically symmetric ball of mass m and radius R is centered at the origin. A thin rod has a mass M uniformly distributed along its length L and lies along the x-axis as shown in the figure below. Determine the gravitational potential energy of the system if U = 0 at x = ∞. y L M т
A 500 kg cart rests atop a hill 30.0 m high on a roller coaster. Its gravitational potential energy is measured relative to the bottom of the hill. The cart then rolls down the hill. Which of these best describes what is happening in this situation? a. the total mechanical energy of the cart is decreasing, the kinetic energy of the cart is increasing, and the gravitational potential energy of the cart is increasing b. the total mechanical energy of the cart is increasing, the kinetic energy of the cart is increasing, and the gravitational potential energy of the cart is increasing c. the total mechanical energy of the cart is increasing, the kinetic energy of the cart is increasing, and the gravitational potential energy of the cart is decreasing d. the total mechanical energy of the cart is increasing, the kinetic energy of the cart is decreasing, and the gravitational potential energy of the cart is increasing e. the total mechanical energy of…
If R = 22.3 cm, M = 275 g, and m = 108 g in the figure, find the speed of the block after it has descended 12.9 cm starting from rest. Solve the problem using energy conservation principles.