Question

Two objects, A with mass mA=0.25 kg and B with mass mB=1.25 kg, are held at rest on a spring is released, A has a kinetic energy of 22 J and B has a kinetic energy of A) 110 J g is compressed between them. Immediately after the B) 5.5J C) 11 J D) 4.4 J E) 19.4 J 18. A certain wheel has a rotational inertia of 12 kg m2. As it turns through 5.0 rev its angular velocity increases from 5.0 rad/s to 6.0 rad/s. If the net torque is constant its magnitude is: A) 0.016 N m B)0.18 N m C)0.57 Nm D) 2.1 N.m E) 13.2 N m m and a rotational inertia of 4.5 × 10-3 kg·m2 is suspended from Apulley with a radius of 3,0 c the ceiling. A rope passes over it with a 2.0-kg block attached to one end and a 4.0-kg block attached to the other. The rope does not slip on the pulley. When the speed of the heavier block is 2.0 m/s the kinetic energy of the pulley is 19. A) 0.15 J B) 0.30 J C) 1.0 J D) 10 J E) 20 J 20. A disk has a rotational inertia of 6.0 kg m2 and a constant angular acceleration of 20 rad/s2 .If it starts from rest the work done during the first 5.0 s by the net torque acting on it is: A) 0 B) 30 J C) 60 J D) 300 J E) 600 J 21. The position of a 2.0-kg block is given by )-0.5cos(ot)+ 0.5sin(ot)j+ 0.75k with ω= 12 rad/s. What is its angular momentum at t=4s in kg-m2/s? A) 29t +3.5)+3k B) 9.21-7.7) C) 6.0k D)-5.8t+8.2j+6R E) 5.8+6.9j+6k

Answer 1

17 5 4.4丁