NEET2008PhysicsWork, Power and EnergyActual
A roller coaster is designed such that riders experience "weightlessness" as they go round the top of a hill whose radius of curvature is 20 ~m . The speed of the car at the top of the hill is between
Options
- A13 ~m / s and 14 ~m / s
- B14 ~m / s and 15 ~m / s
- C15 ~ms / and 16 ~m / s
- D16 ~m / s and 17 ~m / s
Correct answer
B. 14 ~m / s and 15 ~m / s
Step-by-step solution
Actually, m g-N= m v^2 r For weightlessness, N=0 aligned m g & = m v^2 r v & = g r & = 10 20 ~ms ⁻¹=14.14 ~ms ⁻¹ aligned