An iron bar with an initial temperature of 10°C is heated such that its temperature increases at a rate of 4°C/min. The temperature, C, in degrees Celsius, at any time, t, in minutes, after heat is applied is given by the function c= 10 + 4t. The equation F= 1.8c + 32 is used to convert from C degrees Celsius to F degrees Fahrenheit. Determine the instantaneous rate of change of the temperature, in degrees Fahrenheit, of the bar with respect to time at 4 mins

A 50 lb object is subjected to an applied upward force of 30 lbf. The only other force acting on the object is the force of gravity. The acceleration of gravity is 32.2 ft/s². Determine the weight of the object, in lbf, and the net acceleration of the object, in ft/s². Step 1 Your answer is correct. Determine the weight of the object, in lbf, with positive values being down. Ibf W = 50 Hint Step 2 * Your answer is incorrect. Determine the net acceleration of the object, in ft/s², with positive values being upward. i 12.88 ft/s² Attempts: 1 of 4 used

A firearm can be modeled as a kind of heat engine, where the projectile acts as a piston that separates from the rest of the system during expansion. Consider a rifle with a 1.70 kg barrel made of iron [specific heat = 448 J/(kg °C)]. The rifle fires a 4.00 g bullet that exits the barrel with a speed of 350 m/s. When the propellant is ignited, 1.10% of the energy released goes into propelling the bullet (this is the thermal efficiency of the "engine"). The other 98.9% can be approximated as being entirely absorbed by the barrel, which increases in temperature uniformly for a short time before this energy is dissipated into the surroundings. What is this temperature increase (in °C)? (Round your answer to at least one decimal place.) °℃

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A food product containing 80% moisture content is being frozen. Estimate the specific heat of the product at -6 ° C when 80% of the water is frozen. The specific heat of the dry product is 2 kJ / (kg ° C). It is assumed that the specific heat of water at -10 ° C is the same as the specific heat of water at 0 ° C, and that the specific heat of ice follows the function Cp es = 0.0062 Tbeku + 2.0649. Cp frozen product = Answer kJ / kg ° C.