A shell of mass 0.020kg is fired by a gun of mass 100kg. If the muzzle speed of the shell is 80m/s. what is the recoil speed of the gun?
Sahay Sir > Question Answers > A shell of mass 0.020kg is fired by a gun of mass 100kg. If the muzzle speed of the shell is 80m/s. what is the recoil speed of the gun?
A family uses 8kW of power. (a) Direct solar energy is incident on the horizontal surface at an average rate of 200 W per square metre. If 20% of this energy can be converted to useful electrical energy, how large an area is needed to supply 8kW? (b) Compare this area to that of the roof of a typical house.
27
Nov
A family uses 8kW of power. (a) Direct solar energy is incident on the horizontal surface at an average rate of 200 W per square metre. If 20% of this energy can be converted to useful electrical energy, how large an area is needed to supply 8kW? (b) Compare this area to that of the [...]
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 [...]
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 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 [...]
Figure shows a man standing stationary with respect to a horizontal conveyor belt that is accelerating with 1ms^−2 . What is the net force on the man? If the coefficient of static friction between the man’s shoes and the belt is 0.2, up to what acceleration of the belt can the man continue to be stationary relative to the belt? (Mass of the man =65kg)
27
Nov
Figure shows a man standing stationary with respect to a horizontal conveyor belt that is accelerating with 1ms^−2 . What is the net force on the man? If the coefficient of static friction between the man’s shoes and the belt is 0.2, up to what acceleration of the belt can the man continue to be [...]
The figure shows the position-time graph of a body of mass 0.04 kg. Suggest a suitable physical context for this motion. What is the time between two consecutive impulses received by the body? What is the magnitude of each impulse?
27
Nov
The figure shows the position-time graph of a body of mass 0.04 kg. Suggest a suitable physical context for this motion. What is the time between two consecutive impulses received by the body? What is the magnitude of each impulse? A shell of mass 0.020kg is fired by a gun of mass 100kg. If the [...]
A stone of mass 0.25kg tied to the end of a string is whirled round in a circle of radius 1.5m with speed 40rev/min in a horizontal plane. What is the tension in the string and what is the maximum speed with which the stone can be whirled around, if the string can withstand a maximum tension of 200N?
27
Nov
A stone of mass 0.25kg tied to the end of a string is whirled round in a circle of radius 1.5m with speed 40rev/min in a horizontal plane. What is the tension in the string and what is the maximum speed with which the stone can be whirled around, if the string can withstand a [...]
A stream of water flowing horizontally with a speed of 15ms^−1 pushes out of a tube of cross sectional area 10^−2m^2 and hits a vertical wall near by what is the force exerted on the wall by the impact of water assuming that it does not rebound?
27
Nov
A stream of water flowing horizontally with a speed of 15ms^−1 pushes out of a tube of cross sectional area 10^−2m^2 and hits a vertical wall near by what is the force exerted on the wall by the impact of water assuming that it does not rebound? A shell of mass 0.020kg is fired by [...]