An object whose mass is 90 lb is projected straight upward from the surface of the earth and reaches a height of 900 ft when its velocity reaches zero. The only force acting on the object is the force of gravity. The acceleration of gravity is g = 32.2 ft/s². Determine the initial kinetic energy of the object, in ft·lbf, and the initial velocity of the object, in ft/s.

An object whose mass is 90 lb is projected straight upward from the surface of the earth and reaches a height of 900 ft when its velocity reaches zero. The only force acting on the object is the force of gravity. The acceleration of gravity is g = 32.2 ft/s². Determine the initial kinetic energy of the object, in ft·lbf, and the initial velocity of the object, in ft/s.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

During a process, 50 kJ of work is done on a closed system while 20 kJ of heat is lost from the system. If the initial internal energy of the system is 90 kJ, what is the final internal energy of the system?
1
A vehicle having 6509 lbm travels at speed of 100 miles per hour. Compute (a) the mass of the vehicle in kgm, (b) its speed in km/hr and (c) its kinetic energy in kcal.
A nonflow system has a mass of 5 lb. in it. The system undergoes a process during which 200 ft.lbf of heat is transferred to the surroundings. If the system does 1000 ft.·lbf of work on the surroundings, determine the change in specific internal energy of the fluid in lbf/lbm.
A 50 lb object is subjected to an applied upward force of 10 lbf. The only other force acting on the object is the force of gravity. The acceleration of gravity is 32.2 ft/s². * Your answer is incorrect. Determine the net acceleration of the object, in ft/s², with positive values being upward. 32.2 ft/s² a =
The mass of a baseball is 0.833 lb. Determine its kinetic energy relative to home plate of a 95.58 mile per hour fastball, in BTU.
If H is the work output of a heat engine and Q is the total heat input of an engine, then determine its thermal efficiency.
The mass of a baseball is 1.331 lb. Determine its kinetic energy relative to home plate of a 95.27 mile per hour fastball, in BTU.
A construction crane weighing 12,000 lbf fell from a height of 500 ft to the street below during a severe storm. For g = 32.05 ft/s², determine the mass, in lb, and the change in gravitational potential energy of the crane, in ft-lbf.
A fluid flowing in a pipe 1000 ft above the reference line at a pressure of 200 psia, specific volume of 2 ft3 /lb, velocity of 200 ft/sec and internal energy of 100 Btu/lbm. Determine (a) the total energy of the flowing fluid with respect to the reference line and (b) the specific enthalpy in Btu/lbm . Local gravity is 32 ft/sec2 .
An object whose mass is 90 lb is projected straight upward from the surface of the earth and reaches a height of 900 ft when its velocity reaches zero. The only force acting on the object is the force of gravity. The acceleration of gravity is g = 32.2 ft/s?. Determine the initial kinetic energy of the object, in ft-lbf, and the initial velocity of the object, in ft/s.
A system of mass 12 kg undergoes a process during which there is no work, the elevation decreases by 50 m, and the velocity increases from 15 m/s to 50 m/s. The specific internal energy decreases by 5 kJ/kg and the acceleration of gravity is constant at 9.8 m/s2.Determine the change in kinetic energy, in kJ, and the amount of energy transfer by heat for the process, in kJ.