Exam 4: Newtons Laws

Two masses m₁ = 12 kg and m₂ = 35 kg are held connected by a massless rope hung over a frictionless light pulley.If the masses are released then the magnitude of the tension in the string is

If you apply the same force to objects with masses M and 4M,the acceleration of the mass M is

A particle with a mass of 200 g is acted on by a force of 4.5 N.The acceleration of the particle is

A horse harnessed to a wagon refuses to pull,citing Newton's third law,which states that for every force there is an equal but opposite reaction force.The horse,incorrect in its reasoning,can pull the wagon because

Which of the following is not a unit of force?

We all know it makes sense to bend one's knees when dropping from a height. Suppose a very silly 70-kg person were instead to drop down from a height of 1.4 m onto the ground and stop stiffly within a distance of only 0.60 cm.Calculate how many times his own weight is the average force his body feels.

The mass of a body that weighs 2.00 N at sea level is

Your heart pumps 80 g of blood with each beat.The blood starts from rest and reaches a speed of 0.60 m/s in the aorta.If each beat takes 0.16 s,the average force exerted on the blood is

A ball of mass 2.0 kg is acted on by two forces, and .At t = 0 s,the particle is at rest at the origin.The position vector at t = 2 s is

When Newton's first law of motion is mentioned,you should immediately think of

A 10-N force is applied to mass M.The same force is applied to mass 4M.The ratio of the acceleration of the smaller mass to the acceleration of the larger mass is

A lamp of mass m hangs from a spring scale that is attached to the ceiling of an elevator.When the elevator is stopped at the fortieth floor,the scale reads mg.What does it read while the elevator descends toward the ground floor at a constant speed?

A force of F = 90 N is exerted on mass m₁ as shown.Both m₁ and m₂ accelerate to the right at 3 m/s along the frictionless surface.The force F makes an angle of 25 degrees to the horizontal.If m₂ = 10 kg,calculate the mass m₁.

An object is moving to the right at a constant speed.Which one of the following statements must be correct?

An unknown force is applied to two unknown masses M_A and M_B.Their accelerations _A and _B are measured.From these data we can determine

The system in the figure consists of a steel ball attached by a cord to a large block of wood.If the system is dropped in a vacuum,the force in the cord is

A mass m is hanging on a string that passes over a pulley and is then attached to another mass 3m that is resting on a horizontal table.Neglect friction.Mass m is held motionless and is then released.When it has fallen a distance h,it will have a speed v which can be calculated from the formula

A force accelerates a body of mass M.The same force applied to a second body produces three times the acceleration.What is the mass of the second body?

A body is sent out in space.Which of the following statements is true of this body as it moves away from Earth?

A box sits on an inclined plane without sliding.As the angle of inclination increases,the normal force