i need those qs as soon as possible, please

Pregunta 4 A particle positioned at r = (1.0i -3.0j + 2.0k) m is exerted a force F = (3.0i -8.0j + 5.0k) N. What is the torque on the particle? Note: r is the position vector and F is the force vector. Also note that i, j, and k are the unit vectors in the x, y, and z respective directions. Be careful with O (21i + 27] - 9k) mN O (i+j+k) mN O (18i + 12] + 2k) mN O (-21i - 11) + 9k) mN Pregunta 5 Several forces act on an object at rest. It is known that the sum of the forces acting on the object is zero. Which statement is necessarily true? The object's center of mass may accelerate and the object may begin to rotate. The object's center of mass may move in such a way that the object will roll without slipping. The object's center of mass will not move, but the object may begin to rotate. The object will remain stationary. O The object's center of mass may accelerate, but the object will remain in there same orientation