A room has dimension 10cm×15cm ×20com the recerberation time for an empty room is 0.4sec find the average absorption coefficient of the room if the room is provided with curtain clothes of absorption coefficient 0.5what area is covered by the clothes.

In a closed system, the total energy prior to an energy transformation is the total energy after. a. equal to b. unrelated to c. greater than d. less than

The x-coordinate of a particle in curvilinear motion is given by x = 3.1t3 - 4.9t where x is in feet and t is in seconds. the y-component of acceleration in feet per second squared is given by ay = 2.3t. if the particle has y-components y = 0 and vy = 5.0 ft/sec when t = 0, find the magnitudes of the velocity v and acceleration a when t = 1.8 sec. sketch the path for the first 1.8 seconds of motion, and show the velocity and acceleration vectors for t = 1.8 sec. answers: v = ft/sec a = ft/sec2

Need asap ‼️ 20 pts which gravitational force field diagram is drawn correctly? (answers in pictures below)