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Egg incubation is an important determinant of the sex of many reptiles. In a study of loggerhead turtles 100% of the hatchings from eggs incubated at 26°C were male, while 100% of those from eggs incubated at 32°C were female. A study was undertaken of a loggerhead turtle nest on a tropical beach consisting of black volcanic sand. An infrared radiometer was used to monitor upward long wave radiation at the surface of the sand (assume the sand is a perfect blackbody (emitter) covering the eggs. The average Hlux density recorded for the period the eggs were incubating was 617 W/m2. The soil heat Hlux of the sand was found to be 14.4 W/m and the thermal conductivity 0.4 W/(m°C). The turtle eggs were 50 cm below the sand surface. Assuming that the insulating effect of the sand kept the nest at a constant temperature, would you expect the hatchlings to be male or female?
Point charges of +1nc, +3nc and -3nc are located at each of three corners of an equilateral triangle with side length of 30cm. Find the net electrostatic fornce exerted on the +1nc charge.
A dentist's drill starts from rest. After2.80s of constant angular acceleration, it turns at a rate of2.46104rev/min. Find the drill's angular acceleration
Consider a wet roadway banked, where there is a coefficient of static friction of .30 between the tires and the roadway. what is the maximum speed the automobile can have
Suppose you wish to fabricate a uniform wire from 1.30 g of copper. The wire is to have a resistance of R = 0.420 ?and all the copper is to be used. What must be the length of this wire
The filament of a light bulb has a temperature of 2.64 x 103 °C and radiates 60.0 W of power. The emissivity of the filament is 0.388. Find the surface area of the filament
How many homes could be heated with the waste heat
Estimate how much power is saved if the voltage is stepped up from 240 V to 1200 V and then down again, rather than simply transmitting at 240 V
A block with a mass m1 = 1.5 kg is pushed by a mass m2 = 1 kg against a spring with a force constant of k = 750Nm^-1. What is the period of the motion initially
A large cruise ship of mass 6.80 107 kg has a speed of 12.8 m/s at some instant. what is the ship's kinetic energy at this time
A platinum resistance thermometer has resistances of 199.64 ? when placed in a 0°C ice bath and 266.19 ? when immersed in a crucible containing melting potassium. What is the melting point of potassium
Two astronauts are 1.40 m apart in their spaceship. One speaks to the other. The conversation is transmitted to earth via electromagnetic waves. How far away from the earth is the spaceship
A 1.70mcylindrical rod of diameter 0.550cmis connected to a power supply that maintains a constant potential difference of 13.0Vacross its ends, while an ammeter measures the current through it. You observe that at room temperature (20.0C) the amm..
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