Which statement best describes the big bang theory? a. the universe began as a ball of energy and has been collapsing since its formation. b. the universe began as a cloud of dust and gas and has been expanding since its formation. c. the universe began at an outer boundary has been collapsing since its formation. d. the universe began at a single point and has been expanding since its formation.

Choose the most likely outcome of this scenario: jen decided to go bike riding without a helmet. while no one is around during her ride, she is thrown from her bike when her wheel goes into a pothole. she is not injured, but she is terrified to get back on her bike. what happens next? a. her physical health is affected even though she wasn't hurt. b. her mental and emotional health are affected because she is afraid to get back on her bike. c. her social health is affected because she is worried her friends saw the fall. d. her overall health is not affected at all by her fall.

Which of the following is not a physical property of mattera. melting pointb.heat of combustionc. viscosityd. boiling point

Asmall grinding wheel has a moment of inertia of 4.0×10−5 kg⋅m2 . what net torque must be applied to the wheel for its angular acceleration to be 150 rad/s2 ?