Cengage NEET by C.P Singh
A particle of mass m is attached to a light string of length l, the other end of which is fixed. Initially the string is kept horizontal and the particle is given an upward velocity v. The particle is just able to complete a circle. 1. The string becomes slack when the particle reaches its highest point 2. The velocity of the particle becomes zero at the highest point. 3. The kinetic energy of the ball in initial position was 12mv^2=mg 4. The particle again passes through the initial position.
21
Oct
A particle of mass m is attached to a light string of length l, the other end of which is fixed. Initially the string is kept horizontal and the particle is given an upward velocity v. The particle is just able to complete a circle. 1. The string becomes slack when the particle reaches its [...]
In a simple pendulum, the breaking strength of the string is double the weight of the bob. The bob is released from rest when the string is horizontal. The string breaks when it makes an angle θ with the vertical.
21
Oct
In a simple pendulum, the breaking strength of the string is double the weight of the bob. The bob is released from rest when the string is horizontal. The string breaks when it makes an angle θ with the vertical. In a simple pendulum the breaking strength of the string is double the weight of [...]
A weightless thread can support tension up to 30N.A particle of mass 0.5kg is tied to it and is revolved in a circle of radius 2m in a vertical plane. If g=10m/s^2, then the maximum angular velocity of the stone will be
21
Oct
A weightless thread can support tension up to 30N.A particle of mass 0.5kg is tied to it and is revolved in a circle of radius 2m in a vertical plane. If g=10m/s^2, then the maximum angular velocity of the stone will be A weightless thread can support tension up to 30N.A particle of mass 0.5kg [...]
A heavy mass is attached to a thin wire and is whirled in a vertical circle. The wire is most likely to break 1. when the mass is at the highest point 2. when the mass is at the lowest point 3. when the wire is horizontal 4. at an angle of cos^−1(1/3) from the upward vertical.
21
Oct
A heavy mass is attached to a thin wire and is whirled in a vertical circle. The wire is most likely to break 1. when the mass is at the highest point 2. when the mass is at the lowest point 3. when the wire is horizontal 4. at an angle of cos^−1(1/3) from the [...]
A body crosses the topmost point of a vertical circle with a critical speed. Its centripetal acceleration, when the string is horizontal will be
21
Oct
A body crosses the topmost point of a vertical circle with a critical speed. Its centripetal acceleration, when the string is horizontal will be A body crosses the topmost point of a vertical circle with a critical speed. Its centripetal acceleration when the string is horizontal will be October 21, 2020 Category: Cengage NEET by [...]
A 1kg stone at the end of 1m long string is whirled in a vertical circle at a constant speed of 4m/s. The tension in the string is 6N, when the stone is at (g=10m/s^2)
21
Oct
A 1kg stone at the end of 1m long string is whirled in a vertical circle at a constant speed of 4m/s. The tension in the string is 6N, when the stone is at (g=10m/s^2) A 1kg stone at the end of 1m long string is whirled in a vertical circle at a constant speed [...]
A circular road of radius r is banked for a speed v=40 km/hr. A car of mass m attempts to go on the circular road. The friction coefficient between the tyre and the road is negligible. 1. the car cannot make a turn without skidding. 2. If the car turns at a speed less than 40 km/hr, it will slip down 3. If the car turns at the correct speed of 40 km/hr, the force by the road on the car is equal to mu^2/r 4. If the car turns at the correct speed of 40 km/hr, the force by the road on the car is greater than mg as well as greater than `(mu^2)/r
21
Oct
A circular road of radius r is banked for a speed v=40 km/hr. A car of mass m attempts to go on the circular road. The friction coefficient between the tyre and the road is negligible. 1. the car cannot make a turn without skidding. 2. If the car turns at a speed less than [...]
A car of mass M is moving on a horizontal circular path of radius r. At an instant its speed is v and is increasing at a rate a. 1. The net acceleration of the car is towards the centre of its path. 2. The magnitude of the frictional force on the car is greater than Mv^2/R. 3. The friction coefficient between the ground and the car in not less than βg. 4. The friction coefficient between the ground and the car is theta = tha^-1 v^2/Rg.
21
Oct
A car of mass M is moving on a horizontal circular path of radius r. At an instant its speed is v and is increasing at a rate a. 1. The net acceleration of the car is towards the centre of its path. 2. The magnitude of the frictional force on the car is greater [...]
A body moves on a horizontal circular road of radius r, with a tangential acceleration at. The coefficient of friction between the body and the road surface Is μ. It begins to slip when its speed is v. (i) v^2=μrg (ii) μg=(v^4/r^2)+at) (iii) μ^2g^2=(v^4r^2+a^2t (iv) The force of friction makes an angle tan−1(v^2/atr) with the direction of motion at the point of slipping.
21
Oct
A body moves on a horizontal circular road of radius r, with a tangential acceleration at. The coefficient of friction between the body and the road surface Is μ. It begins to slip when its speed is v. (i) v^2=μrg (ii) μg=(v^4/r^2)+at) (iii) μ^2g^2=(v^4r^2+a^2t (iv) The force of friction makes an angle tan−1(v^2/atr) with the [...]
A point moves along an arc of a circle of radius R. Its velocity depends on the distance covered s as v=s√, where a is a constant. Find the angle α between the vector of the total acceleration and the vector of velocity as a function of s.
21
Oct
A point moves along an arc of a circle of radius R. Its velocity depends on the distance covered s as v=s√, where a is a constant. Find the angle α between the vector of the total acceleration and the vector of velocity as a function of s. A point moves along an arc of [...]