Engineering, 21.10.2020 16:01 hqlego6882
A spring-loaded toy gun is used to shoot a ball of mass m = 1.50 kg straight up in the air. The spring has spring constant k = 667 N/m. If the spring is compressed a distance of 25.0 centimeters from its equilibrium position y = 0 and then released, the ball reaches a maximum height h max (measured from the equilibrium position of the spring). There is no air resistance, and the ball never touches the inside of the gun. Assume that all movement occurs in a straight line up and down along the y axis.
1. Which of the following statements are true?
a. Mechanical energy is conserved because no dissipative forces perform work on the ball.
b. The forces of gravity and the spring have potential energies associated with them.
c. No conservative forces act in this problem after the ball is released from the spring gun.
2. Find vm the muzzle velocity of the ball.
3. Find the maximum height hmax of the ball.
Answers: 1
Engineering, 03.07.2019 14:10
Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.
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Engineering, 03.07.2019 15:10
If you were designing a bumper for a car, would you prefer it to exhibit elastic or plastic deformation? why? consider the functions of a bumper in both a minor "fender-bender" and a major collision.
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Engineering, 03.07.2019 15:10
Two flowing streams of argon gas are adiabatically mixed to form a single flow/stream. one stream is 1.5 kg/s at 400 kpa and 200 c while the second stream is 2kg/s at 500 kpa and 100 ? . it is stated that the exit state of the mixed single flow of argon gas is 150 c and 300 kpa. assuming there is no work output or input during the mixing process, does this process violate either the first or the second law or both? explain and state all your assumptions.
Answers: 1
Engineering, 04.07.2019 18:10
The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false
Answers: 2
A spring-loaded toy gun is used to shoot a ball of mass m = 1.50 kg straight up in the air. The spri...
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