4) Consider an 80 kg man and 320 kg horse both running along a road with the same kinetic energy. The man must run (A) with the same speed as the horse. (CSS) 4 times as fast as the horse. (B) twice as fast as the horse. (D) 16 times as fast as the horse.
Kinematics
A machine is a device that accepts energy in some available form and utilizes it to do a type of work. Energy, work, or power has to be transferred from one mechanical part to another to run a machine. While the transfer of energy between two machine parts, those two parts experience a relative motion with each other. Studying such relative motions is termed kinematics.
Kinetic Energy and Work-Energy Theorem
In physics, work is the product of the net force in direction of the displacement and the magnitude of this displacement or it can also be defined as the energy transfer of an object when it is moved for a distance due to the forces acting on it in the direction of displacement and perpendicular to the displacement which is called the normal force. Energy is the capacity of any object doing work. The SI unit of work is joule and energy is Joule. This principle follows the second law of Newton's law of motion where the net force causes the acceleration of an object. The force of gravity which is downward force and the normal force acting on an object which is perpendicular to the object are equal in magnitude but opposite to the direction, so while determining the net force, these two components cancel out. The net force is the horizontal component of the force and in our explanation, we consider everything as frictionless surface since friction should also be calculated while called the work-energy component of the object. The two most basics of energy classification are potential energy and kinetic energy. There are various kinds of kinetic energy like chemical, mechanical, thermal, nuclear, electrical, radiant energy, and so on. The work is done when there is a change in energy and it mainly depends on the application of force and movement of the object. Let us say how much work is needed to lift a 5kg ball 5m high. Work is mathematically represented as Force ×Displacement. So it will be 5kg times the gravitational constant on earth and the distance moved by the object. Wnet=Fnet times Displacement.
![(A)100 J
(B) 300 J
(C)50 J
(D) 125 J
4) Consider an 80 kg man and 320 kg horse both running along a road with the same kinetic energy.
The man must run
(A) with the same speed as the horse.
(CSS) 4 times as fast as the horse.
(B) twice as fast as the horse.
(D) 16 times as fast as the horse.
5)particle A is travelling at a velocity of [ ]m/s. It collides with particle B which has a velocity of
10
]m/s. The particle move together. The mass of particle A is 2kg and the mass of particle B is 3kg.
8.
Find the velocity of the combined particles after the collision.
8.
(A) [ ]m/s
4
8.4
Im/s
(C)20
42,
Jm/s
50
(D) m/s
4
16'
6)Which of the following is NOT true about conservation of linear momentum.
(A)The impulse becomes to zero.
(C)The total momentum is constant.
(B)The change in momentum is constant.
(D)The change in momentum is zero
7)Two billiard balls of equal mass undergo a perfectly elastic head- on collision. If the speed of one ball
was initially 2.00m/s, and of the other 3.00m/s in the opposite direction, what will be their speeds
Vi & V2 after the collision respectively?
(A)2m/s &-3m/s
(B) -3m/s & 2m/s
(C)2m/s & 3m/s
(D)-3m/s &-2m/s
By Yishak Paulos
Date of Submission : 26/08/2013E.C
oist!"](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fde7c0a8f-7105-47e7-bfbd-c24bb25e1be1%2F73aa4619-7bc0-4b52-ac3f-6d27f1a045dc%2Fmejw90q_processed.jpeg&w=3840&q=75)
Trending now
This is a popular solution!
Step by step
Solved in 3 steps
