Q21.A body of mass m is launched up on a rough inclined plane making an angle of 30° with the horizontal. The coefficient of friction between the body and plane is √x if the time of ascent is half of the time of descent. The 5 value of x is
What This Question Tests
This question tests the ability to apply Newton's second law on an inclined plane with friction for both upward and downward motion, and then use kinematic equations to relate the times of ascent and descent.
Concepts Tested
Formulas Used
F_net = ma
f_k = μ_k N
N = mg cosθ
s = ut + 1/2 at^2
📚 NCERT Sections This Tests
6.11 — Dynamics Of Rotational
Physics Class 11 · Chapter 6
6.11 Dynamics of rotational the motion of extended bodies. motion about a fixed axis A large class of problems with extended bodies can be
11.5 — In An Experiment On Photoelectric Effect, The Slope Of The Cut-Off Voltage
Physics Class 12 · Chapter 11
11.5 In an experiment on photoelectric effect, the slope of the cut-off voltage versus frequency of incident light is found to be 4.12 × 10–15 V s. Calculate the value of Planck’s constant.
2.1 — Two Charges 5 × 10–8 C And –3 × 10–8 C Are Located 16 Cm Apart. At
Physics Class 11 · Chapter 2
2.1 Two charges 5 × 10–8 C and –3 × 10–8 C are located 16 cm apart. At what point(s) on the line joining the two charges is the electric potential zero? Take the potential at infinity to be zero.
📋 Question Details
- Chapter
- Laws of Motion
- Topic
- Motion on inclined plane with friction
- Year
- 2021
- Shift
- 20 Jul Shift 2
- Q Number
- Q21
- Type
- Numerical
- NCERT Ref
- Class 11 Physics Ch 5: Laws of Motion
More from this Chapter
Q1. Two forces are such that the sum of their magnitudes is 18 N and their resultant is 12 N which is perpendicular to the smaller force. Then the magnitudes of the forces are (1) 12 N, 6 N (2) 13 N, 5 N (3) 10 N, 8 N (4) 16 N, 2 N
Q6. The minimum velocity (in ms−1 ) with which a car driver must traverse a flat curve of radius 150 m and coefficient of friction 0.6 to avoid skidding is (1) 60 (2) 30 (3) 15 (4) 25
Q7. A lift is moving down with acceleration a. A man in the lift drops a ball inside the lift. The acceleration of the ball as observed by the man in the lift and a man standing stationary on the ground are respectively (1) g, g (2) g - a, g - a (3) g - a, g (4) a, g
Q8. When forces F1, F2, F3 are acting on a particle of mass m such that F2 and F3 are mutually perpendicular, then the particle remains stationary. If the force F1 is now removed then the acceleration of the particle is (1) F1/m (2) F2 F3/mF1 (3) (F2 −F3)/m (4) F2/m