6. Forces

Newton's second law of motion leads to: the rate of change of linear momentum is equal to the applied moment the rate of change of linear momentum is equal to the applied force the rate of change of angular momentum is equal to the applied force the mass times acceleration of a particle is equal to the applied force

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Problem 1. An object with a mass of 200 kg is attached to a rope wound around a pulley which is attached to a horizontal rotating shaft. The radius of the pulley is 25 cm. Power is transmitted through the shaft, causing the object to be lifted at a constant velocity of 2 m/s. Assume a gravitational acceleration g = 9.81 m/s?. Pulley R = 25 cm a) Determine the kinetic energy of the object, in Joules. V = 2 m/s b) Calculate the power transmitted through the shaft, in Watts. c) Calculate the rotational speed of the shaft, in RPM. m = 200 kg %3D

(Thermodynamics)(True or False) A steady-flow system can involve boundary work.

COMPLETE SOLUTION PLS 4 DECIMAL PLACES COMPLETE SOLUTION PLS 4 DECIMAL PLACES COMPLETE SOLUTION PLS 4 DECIMAL PLACES

Q1. Match the following principles to their respective descriptions: Usually applied to a short period of time involving a system of objects, when external impulsive forces are negligible Scalar equation(s) that can be applied to general situations Applied to specific situations when only conservative forces do work Vector equation(s) that can be applied to general situations 1. Principle of work and energy Principle of linear impulse and momentum 2. 3. Conservation of energy 4. Conservation of linear momentum

Which of the following would Newton's first law alone NOT account for?     1)  Passengers on board an elevator undergoing uniform motion can't tell that the elevator is really moving.   2)  A passenger leans forward in her seat when the car's brakes are applied.   3)  During launch, astronauts feel that they are being pushed back into their seats.   4)  No matter how hard you push against it, the boulder would not move.   5)  A rocket accelerates upward from a launch pad and the engines' thrust overcomes gravity.

Three identical balls are tied by light strings to the same vertical light rod and rotate around it with the same angular velocity, as shown below. a) What is the ratio of the rotational kinetic energy of the first ball to the rotational kinetic energy of the second ball, to the rotational kinetic energy of the third ball? Demonstrate the answer in a form of KE1 : KE2 :KE3 b) Imagine, during the rotation, the second string broke and second ball got removed from the system. If the masses of the balls are 100g each and initial angular velocity (before string broke) was 10 rpm, what is the new angular velocity, when only first and third balls remain rotating? c) Where is the center of mass of this system is located? 1 m ball 1 2 m ball 2 3 m ball 3

Q1. Two asteroids collide and stick together. The first asteroid has mass of 15×10³kg and is initially moving at 770 m/s. The second asteroid has mass of 20×10³kg and is moving at 1020 m/s. Their initial velocities made an angle of 20° with respect to each other. What is the final speed and direction with respect to the velocity of the first asteroid?

196B/s.110. The coefficint of friction is 0.43 A 3.0 kilogram block is sliding down a 25° incline at a constant speed. 1 0.44 0.38 0.33 0.47 The moment reaction at B is 800N 0.16m + 203 Nm - 175 Nm + 185 Nm 17 Ma 60 deg 0.20m O if A ۱۰:۰۱ ص M

PLEASE ANSWER NUMBER 2.MECH 221: PLEASE GIVE DETAILED SOLUTIONS AND CORRECT ANSWERS. I WILL REPORT TO BARTLEBY THOSE TUTORS WHO WILL GIVE INCORRECT ANSWERS.