Ablock (mass = 74.0 kg) is hanging from a massless cord that is wrapped around a pulley (moment of inertia = 1/2mr2 kg · m2, where m = 7.9 is the mass of the pulley and r=1.4 is its radius ), as the drawing shows. initially the pulley is prevented from rotating and the block is stationary. then, the pulley is allowed to rotate as the block falls. the cord does not slip relative to the pulley as the block falls. assume that the radius of the cord around the pulley remains constant at a value of r=r=1.4 m during the block's descent, and the distance of the block at initial position to the floor is 7.0 m. what is the angular velocity in round per minute when the block drops to the floor? use g = 10 m/s2.
Answers: 1
Another question on Physics
Physics, 22.06.2019 05:50
High schoolphysics 5+3 pts a neon light consists of a glass tube with metal wires at each end. when connected to a high-voltage source, the gas glows. if a fly lands on the glass tube, what will most likely happen? a) the fly will not feel a shock because the glass conducts any free electrons back into the gas. b) electrons will flow directly from the metal wires along the glass and shock the fly. c) the fly will not feel a shock because the glass insulates it from the electrons in the gas and the metal. d) electrons that are moving through the gas will be conducted through the glass and shock the fly.
Answers: 3
Physics, 22.06.2019 07:30
Identify the theory that can be used to explain each phenomenon. answers diffraction: wave theory interference: wave theory reflection: both particle and wave theories refraction: both particle and wave theories
Answers: 3
Physics, 22.06.2019 22:30
The drag force, fd, imposed by the surrounding air on a vehicle moving with velocity v is given by fd = cdaρv 2/2 where cd is a constant called the drag coefficient, a is the projected frontal area of the vehicle, and ρ is the air density. an automobile is moving at v = 80 kilometers per hour with cd = 0.28, a = 2.3 m2, and ρ = 1.2 kg/m3.
Answers: 2
You know the right answer?
Ablock (mass = 74.0 kg) is hanging from a massless cord that is wrapped around a pulley (moment of i...
Questions
Mathematics, 23.10.2019 02:00
