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A body with a mass of 1 ton is attached to a rod with a hinge, the rod is 12 meters long and the hinge is 2 meters from the body.
If a force of 120 Newtons is applied to the rod at the far end of the body, find the force exerted on the body.
What force should be applied to lift the body at a torn speed?
A student pulls a box to the right by applying 20.0 N force on the rope. Identify the action-reaction pairs. Select two answers.
(A) The hand exerts a force on the rope and the rope exerts a force on the box
(B) The rope exerts a force on the box and the box exerts a force on the rope
(C ) The gravitational force of the box is the reaction force to the normal force exerted by the floor.
(D) The weight of the box and the gravitational force the box exerts on the Earth is an action-reaction pair
Two bumper cars, car A with a mass of 200 kg and car B with a mass of 150 kg, collide in an amusement park ride . The force that car A exerts on car B is
(A) larger than the force that car B exerts on car A because car A has a larger mass
(B) smaller than the force that car B exerts of car A because of the difference in the mass
(C) equal in magnitude and in the same direction as the force that car B exerts on car A because of Newton's third law.
(D) equal in magnitude and opposite to the direction of the force that car B exerts on car A because of Newton's third law.
A block sliding with some initial velocity over a flat surface slows due to the frictional force acting between the block and the surface. This is because (select answers)
(A) intermolecular forces of attraction between the molecules of the two surfaces may become large enough to impede the motion of the block.
(B) small irregularities on both surfaces may snag and resist the sliding of the block .
(C) gravitational force changes the normal force to the surface causing the coefficient of friction between the surfaces to increase
(D) action reaction pairs between the block and the surface impede the motion .
An elevator manufacturer determines the maximum force acting on ascending passengers should not exceed 110% of a standing passenger's weight on their feet . What would be the minimum time possible according to this manufacturer to rise 10 floors from rest if each floor is 5.00 m apart?
(A) 6.00
(B) 10.0
(C) 19.0
(D) 24.0
What is the magnitude of the friction force acting 100 N wagon if the wagon accelerates at pulling on its handle with 80.0 N of force at an angle of 60.0 degrees from horizontal?
(A) 20.0 N
(B) 35.0 N
(C) 40.0 N
(D) 50.0 N
The gravitational attraction between two rocks of equal mass in deep space is 16.0 N. If both rocks double in mass and the distance separating the two rocks doubles , what is the resulting gravitational force between them ?
(A) 8.00 N
(B) 12.0 N
(C ) 16.0 N
(D ) 32.0 N
A student proposes a method to determine the frictional force acting on an accelerating mass by setting up the following equipment and performing a Newton's second law experiment.
The experimental data the student will need to make the needed calculations for the analysis of the friction force are best obtained from
(A) the mass of the two objects, the time of fall, and the distance the hanging body falls.
(B) the mass of the two objects and the distance along the tabletop
(C) the mass of the body hanging from the pulley, the time of fall, and the distance this body falls.
(D) the mass of the body on the table, the time of fall, and the distance the hanging body falls.
The particle displacement y of air molecules due to a sound wave is given by
y=0.008coswtsinkz where k=4π÷m and w=50πrads/s.
Calculate:
I) the distance between 2 consecutive nodes
ii) the amplitude after 0.565s
Two 1.60kg carts on a low-friction track are rigged with magnets so that the carts repel each other when they approach each other. One cart has an initial velocity of +0.323 m/s, and the other has an initial velocity of -0.147 m/s. What is the maximum energy stored in the magnetic field during the collision, assuming that the carts never touch each other?
