A 4.0-kg cylinder of solid iron is supported by a string while submerged in water. What is the tension in the string? The density of iron is 7860 kg/m3 and that of water is 1000 kg/m3
A) 24 N B) 40 N C) 20 N D) 2.5 N E) 34 N
E
You might also like to view...
Carnot Engine: A coal-fired plant generates 600 MW of electric power. The plant uses 4.8 × 106 kg of coal each day, and the heat of combustion of coal is 3.3 × 107 J/kg. The steam that drives the turbines is at a temperature of 300°C, and the exhaust water is at 37°C.(a) What is the overall efficiency of the plant for generating electric power?(b) How much thermal energy is exhausted each day?(c) Using the same heat reservoirs, what is the maximum possible efficiency for a heat engine?
What will be an ideal response?
A point charge Q is placed on the x axis at the origin. An identical point charge is placed on the x axis at x = ?1.0 m and another at x = +1.0 m. If Q = 40 ?C, what is the magnitude of the electrostatic force on the charge at x = +1.0 m?
A. 29 N B. 14 N C. 11 N D. 18 N E. 7.0 N
A certain speed boat weighs 4,900 N. It can accelerate from 0 to 20 m/s in 5 seconds. (a) What is the mass of the boat? (b) What is the acceleration? (c) How large is the net force acting on the boat?
At the point of fission, a nucleus of U-238, with 92 protons is divided into two smaller spheres each with 46 protons and a radius of 5.9 × 10^?15 m. What is the repulsive force pushing the two spheres apart when they are just touching one another? (The mass of the U-238 nucleus is 3.98 × 10^?25 kg.)