A reference frame attached to the earth (a) is an inertial frame by definition

(d) Cnidarians that live in colonies

(a) : When lift is standing, W1 = mg When the lift descends with acceleration a,  W2 = m (g – a) Therefore, w2/w1 = m(g - a)/mg = (9.8 - 5)/9.8 =...

(d) zero. Explanation: Centrifugal force is a pseudo force needed in an non-inertial frame of reference when we still want to use the Newton's Laws. In this case the frame of reference is inertial, so there is no centrifugal...

(d) both A and B are false. Explanation:  With the application of pseudo force in a noninertial frame of reference velocities change, so do linear momentum and kinetic energy because both depend...

(c) 0 Explanation:  Since the body is uniformly rotating, the resultant force on the particle P will be in the radial direction. So again the directions of A and B will be...

(c) horizontal and intersecting the axis Explanation:  Since the body is rotating uniformly, a particle not on the axis moves in a uniform circular motion. This circle will be horizontal with its center at...

(c) the frame may be inertial but the resultant force on the particle is zero (d) the frame may be noninertial but there is a nonzero resultant force. Explanation:  (a) is incorrect because...

(a) Both the frames are inertial. (b) Both the frames are noninertial. Explanation: S1 is moving with constant velocity w.r.t frame S2 . So, if S1 is inertial, then S2 will be inertial...

(d) zero. Explanation: Centrifugal force is a pseudo force needed in an non-inertial frame of reference when we still want to use the Newton's Laws. In this case the frame of reference is...

(c) horizontal and intersecting the axis Explanation:  Since the body is rotating uniformly, a particle not on the axis moves in a uniform circular motion. This circle will be horizontal with its...