Tag: physics

light travels at a speed of 1.17 x 10 to the 7th power. if pluto is 3,670,000,000miles away, how long does it take for light to travel to pluto

A piston–cylinder device contains 0.85 kg of refrigerant-134a at -10°C. The piston that is free to move has a mass of 60 kg and a diameter of 25 cm. The local atmospheric pressure is 88 kPa. Now, heat is transferred to refrigerant-134a until the temperature is 20°C. a) Determine the final pressure b) Determine the change in the volume of the cylinder c) Determine the change in the internal energy of the refrigerant-134a. d) Draw the T-v and P-v diagrams of the process

An object is launched at a speed of 25.5 m/s from the top of a tall tower. The height y of the object as a function of the time t elapsed from launch is y(t) = ?4.9t2 + 19.32t + 40, where y is in meters and t is in seconds. (a) Determine the height H of the tower. (b) Determine the launch angle. ° (c) Determine the horizontal distance traveled by the object before it hits the ground.