1:

A 21.8-kg mass. at rest on a horizontal frictionless surface, is attached to a spring that has been compressed a distance of 18.5 cm from its resting position. If the mass accelerates at 9.65 nw's2 when it is released. what is the spring constant of the spring? 0 9.85 )1 102 mm 0 1.0? )1 103 mm 0 1.14 )1 103 mm 0 1.96 )1 103 mm A disk is spinning at a frequency.r of 248 Hz. The time, expressed in scientific notation, required for the disk to rotate through an angle of 180\" is b x lws. The value of b is ______ . [Record your three-digit answer on the answer sheet.) :i'r A pendulum bob is suspended by a 0.950-m-long string. When the pendulum is pulled sideways so that the angle the string makes with the vertical is 7.50, the restoring force acting on the pendulum is 4.95 N. What is the mass of the pendulum bob? O 3.87 kg 3.83 kg 4.99 kg 4.95 kg