Chapter 4 – Laws of Motion
A 70kg man stands in contact against the inner wall of a hollow cylindrical drum of radius 3m rotating about its vertical axis. The coefficient of friction between the wall and his clothing is 0.15 . What is the minimum rotational speed of the cylinder to enable the man to remain stuck to the wall (without falling) when the floor is suddenly removed?
27
Nov
A 70kg man stands in contact against the inner wall of a hollow cylindrical drum of radius 3m rotating about its vertical axis. The coefficient of friction between the wall and his clothing is 0.15 . What is the minimum rotational speed of the cylinder to enable the man to remain stuck to the wall [...]
A disc revolves with a speed of 33 3/1 rev/min, and has a radius of 15 cm. Two coins are placed at 4 cm and 14 cm away from the centre of the record. If the coefficient of friction between the coins and the record is 0.15, which of the coins will revolve with the record?
27
Nov
A disc revolves with a speed of 33 3/1 rev/min, and has a radius of 15 cm. Two coins are placed at 4 cm and 14 cm away from the centre of the record. If the coefficient of friction between the coins and the record is 0.15, which of the coins will revolve with the [...]
The rear side of a truck is open and a box of 40 kg mass is placed 5 m from the open end The coefficient of friction between the box and the surface below it is 0.15 On a straight road the truck starts from rest and accelerates with 2m/s^2. At what distance from the starting point does the box fall off the truck ? Ignore the size of the box .
27
Nov
The rear side of a truck is open and a box of 40 kg mass is placed 5 m from the open end The coefficient of friction between the box and the surface below it is 0.15 On a straight road the truck starts from rest and accelerates with 2m/s^2. At what distance from the [...]
A block of mass 15kg is placed on a long trolley. The coefficient of static friction between the block and the trolley is 0.18. The trolley accelerates from rest with 0.5ms^−2 for 20s and then moves with uniform velocity. Discuss the motion of the block as viewed by, (a) a stationary observer on the ground. (b) an observer moving with the trolley.
27
Nov
A block of mass 15kg is placed on a long trolley. The coefficient of static friction between the block and the trolley is 0.18. The trolley accelerates from rest with 0.5ms^−2 for 20s and then moves with uniform velocity. Discuss the motion of the block as viewed by, (a) a stationary observer on the ground. [...]
Two bodies A and B of mass 5kg and 10kg, in contact with each other rest on a table against a rigid wall (see figure). The coefficient of friction between the bodies and the table is 0.15. A force of 200N is applied horizontally to A. What are (a) the reaction of the vertical wall. (b) the action-reaction forces between A and B? What happens when the wall is removed? Does the answer to (b) change, when the bodies are in motion? Ignore the difference between μs and μk.
27
Nov
Two bodies A and B of mass 5kg and 10kg, in contact with each other rest on a table against a rigid wall (see figure). The coefficient of friction between the bodies and the table is 0.15. A force of 200N is applied horizontally to A. What are (a) the reaction of the vertical wall. [...]
A monkey of mass 40 kg climbs on a rope which can stand a maximum tension of 600 N. In which of the following cases will the rope break. When the monkey
27
Nov
A monkey of mass 40 kg climbs on a rope which can stand a maximum tension of 600 N. In which of the following cases will the rope break. When the monkey A monkey of mass 40 kg climbs on a rope which can stand a maximum tension of 600 N. In which of the [...]
A block of mass 25 kg is raised by a 50kg man in two different ways as shown in fig. what is the action on the floor by the man in the two cases? If the floor yields to a normal force of 700N, which mode should the man adopt to lift the block without the floor yielding?
27
Nov
A block of mass 25 kg is raised by a 50kg man in two different ways as shown in fig. what is the action on the floor by the man in the two cases? If the floor yields to a normal force of 700N, which mode should the man adopt to lift the block without [...]
An aircraft executes a horizontal loop at a speed of 720 km/h with its wings banked at 15^0 . What is the radius of the loop?
27
Nov
An aircraft executes a horizontal loop at a speed of 720 km/h with its wings banked at 15^0 . What is the radius of the loop? An aircraft executes a horizontal loop at a speed of 720 km/h with its wings banked at 15^0 . What is the radius of the loop? November 27, 2020 [...]
Ten one-rupee coins are put on top of each other on a table. Each coin has a mass m. Give the magnitude and direction of
27
Nov
Ten one-rupee coins are put on top of each other on a table. Each coin has a mass m. Give the magnitude and direction of Ten one-rupee coins are put on top of each other on a table. Each coin has a mass m. Give the magnitude and direction of November 27, 2020 Category: Chapter [...]
A helicopter of mass 1000 kg rises with a vertical acceleration of 15ms^−2 The crew and the passengers weight 300 kg Give the magnitude and direction of (a) force on the floor by the the crew and passengers (b) action of the rotor of the helicopter on surrounding air (c) force on the helicopter due to surrounding air
27
Nov
A helicopter of mass 1000 kg rises with a vertical acceleration of 15ms^−2 The crew and the passengers weight 300 kg Give the magnitude and direction of (a) force on the floor by the the crew and passengers (b) action of the rotor of the helicopter on surrounding air (c) force on the helicopter due [...]