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A non-insulated pipe passes through a room in which air and walls are at 25°C. The outside
diameter of the pipe is 70 mm, and its surface temperature and emissivity are 200°C and 0.8,
respectively. What are the surface emissive power and irradiation? If the coefficient associated
with free convection heat transfer from the surface is 15W/m2K, what is the rate of heat loss
from the surface per unit length of the pipe?
(E = 2270.48 W/m2
, G = 447.14 W/m2
, Q/l = 997.90 W/m)
A point charge 𝑞1 = +6.00 𝑥 10−9𝐶 is at the point 𝑥 = 0.800 𝑚, 𝑦 = 0.600 𝑚 and a second point charge 𝑞2 = −2.00 𝑥 10−9𝐶 is at the point 𝑥 = 0.800 𝑚, 𝑦 = 0 𝑚. Calculate the magnitude and direction of the resultant electric field at the origin due to these charges.
A point charge 𝑞 = 8.00 𝑥 10−9𝐶 is at the center of the cube with sides of length 0.200 m. What is the electric flux through one of the six faces of the cube?
A 1.6m tall man stands in front of a plane mirror.how tall is the image form
1. A 50-kg barbell is lifted at a height of 1.4m from the floor in 1.2 seconds. What is the work done? how much power is expended?
2. A 60 kg block at rest was pushed by a 100 N force on a frictionless horizontal.
A. what is the kinetic energy of the block at a distance of 8 meters?
B. what is the velocity of the blockat a distance of 8 meters?
A Carnot heat engine with an efficiency of 60% receives heat of 3000kj from a source and reject the waste heat to medium at 300k.Determine the source temperature
Three charges are arranged in a line. The distance between Q1 and Q2 is 0.35 m and the distance between Q2 and Q3 is 0.45 m. What is the ner electrostatic force acting on Q3? And what is the net electrostatic force acting on Q1 if the distance between Q1 and Q2 becomes twice as much as the distance of Q2 and Q3 which is 0.45 m?
Two identical tiny metal balls have charges Q1 and Q2. The repulsive force one exerts on the other when they are 25 cm apart is 7.33 x 10^-4 N. After the balls are touched together and then separated again to 25 cm, the repulsive force is found to be 9.67 x 10^-4 N. What are the charges of Q1 and Q2
A spherical ball of plasma has a radius of 0.50 m. The electric field on the surface of the ball is measured to be 8.9 x 103 N/C and points radially inward toward the center. What is the value of the electric charge
Two identical conducting spherese are placed with their centers 45 cm apart one is given a charge of +12 x 10^-9 C and the other is given a charge of -18 x 10^-9 C. the spheres are connected by a conducting wire. After equilibrium has occurred, find the electric force between the two spheres
