The difference between the speed of sound n air at 0°c and the speed of sound in air at 20°c is a. cooler air molecules move more slowly and respond less readily to the energy of a sound wave. b. cooler air molecules move more quickly and respond less readily to the energy of a sound wave. c. cooler air molecules do not move and respond less readily to the energy of a sound wave. d. cooler air molecules move more randomly and respond less readily to the energy of a sound wave.

The car hoist allows the car to be driven onto the platform, after which the rear wheels are raised. if the loading from both rear wheels is 1380 lb, determine the force in the hydraulic cylinder ab. neglect the weight of the platform itself. member bcd is a right-angle bell crank pinned to the ramp at c. the force is positive if in tension, negative if in compression.

Which two particles are found in the center of an atom

Awater balloon launcher uses an elastic band with a spring constant of 115 n/m to use thee launcher you stretch thee band back with a balloon n it the water balloons have a mass of 1.3 kg a) if you stretch the band by 0.8 m, what elastic force will the band exert? b) with the band stretched 0.8 m, how much elastic potential energy is stored in the spring? c) if you release the band, it pushes forward. what is the kinetic energy of the balloon when it reaches the natural length of the band? d) what is the speed of the balloon when it reaches the natural length of the band?