Question

1. Determine the upward applied force, in lbf, required to accelerate a 2,04 kg model rocket vertically upward. with an acceleration of 3 g's. The only other significant force acting on the rocket is gravity, and I g9,8 m/s2. 2. Figure 2 shows an object whose mass is 5 lb attached to a rope wound around a pulley. The radius of the pulley is 3 in. If the mass falls at a constant velocity of 5 ft/s, determine the power transmitted to the puley, in hp, and the rotational speed of the shaft, in revolutions per minute (RPM). The acceleration of gravity is 32.2 ft/s Pulley R-3 in. 3,859K103 tv-snh 3. As shown in Fig. 3, a closed, rigid tank fitted with a fine-wire electric resistor is filled with Refrigerant 22, initially at -10'C, a quality of 80 % , and a volume of 0.01 m. A 12-volt battery provides a 5-amp current to the resistor for 5 minutes. If the final temperature of the refrigerant is 40C, determine the heat transfer, in kJ, fron the refrigerant. Rebrigera 22 T,-10c BO% T-40C V-00l 2 bary povides a Sany cama f 5mi Resin Fe. 32,3 31,2

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Answer 1

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