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In very cold weather, a significant mechanism for heat loss by the human body is energy expended in warming the air taken into the lungs with each breath. How much heat is lost per hour if the respi
Nichrome wire of cross-sectional radius 0.758 mm is to be used in winding a heating coil. find the length of wire you must use to wind the coil
For the two conducting balls as described in problem 1, when one ball is attached to a torsion balance the wire is twisted by a torsional angle of 1°. find the torsion constant of the wire
A rod 50 cm long and 1.0 cm in radius carries a 2.0 microC charge distributed uniformly over its length. Find the approximate magnitude of the electric field
In a Carnot cycle, the isothermal expansion of an ideal gas takes place at 400K, determine the work performed by the gas during the cycle
You are on an airplane traveling 30° south of due west at 180.0 m/s with respect to the air. What is the heading of the plane with respect to the ground
Two steel juggling balls each carry a charge of 2.75 ?C. find the distance between the centers of the two balls
Two grapes are given equal charges and held apart at a distance of 2.0 m. Find the magnitude of the charge on each grape
A particle leaves the origin with an initial velocity=(3.76i)m/s and a constant acceleration =(-1.43i-2.69j) m/s^2. find velocity and position vector of particle
A ball is thrown from the top of a building upward at an angle of 46 degrees to the horizontal and with an initial speed of 30m/s. the speed of the ball just before it strikes the ground
a shower head has 20 circulaar openings, each with radiius 1.0 mm. what is its speed as it exits the shower head openings
a solid aluminum ingot weighs 89n in the air. the ignot is suspended from a rope and totally immersed inn water. what is the tension in the rope
If a helium nucleus with a mass of 6.68 10-27 kg, a charge of +2e, how close will the helium atom come to the gold nucleus before it stops and turns around
A single string is made up of two strings of different densities joined together. Each of the strings is 1.40 m long. what is the tension on the combined string
a 12.0 g plastic ball is dropped from a height of 2.50 m, How much mechanical energy was lost during the balls fall
a 1.5 kg box moves back and forth on a horizontal frictionless surface between two different springs. by how much will the box compress the weaker spring
What is the temperature at point B?What is the work done BY the gas in the transition A to B? What is the efficiency of a Carnot cycle running between the lowest and highest temperature of the cycle a
The position of an object as a function of time is given by , where is a constant. Find an expression for the instantaneous velocity
During a 10 minute period, 30 grams of steam condenses into water. How much energy flowed out of the water-steam mixture, What is the change in the entropy of the water-steam mixture
A firefighting crew uses a water cannon that shoots water at 29.0m at a fixed angle of 52.0 degrees above the horizontal. How far from the building should they position their cannon
The mass of a copper atom is 1.54 10-25 kg, and the density of copper is 8 920 kg/m3. Find the edge dimension of each cube
What is the mass of water before the hot iron is put into the cup? How much energy is required to melt all of the ice, How much energy leaves the iron in the form of heat
Two electrodes are placed in a calcium chloride solution and a potential difference is maintained between them. calculate the current in the solution
An insulating rod of length 11.7-cm and charge 27 nC is in a plane with a long straight uniform line charge. What is the electric force on the rod
The 73 kg student balances an 1100 kg elephant on a hydraulic lift. Inside the lift is filled with oil and the diameter of the piston the elephant is standing on is 2.0 m, What is the second student