Exam 4: The Laws of Motion

If $\alpha$ = 40 $\degree$ , $\beta$ = 60 $\degree$ ,and M = 4.0 kg,determine the tension in string 1.

If the tension,T,is 15 N and the magnitude of the acceleration,a,is 3.0 m/s²,what is the mass,m,of the suspended object? Assume that all surfaces and the pulley are frictionless.

A 70-kg stunt artist rides in a rocket sled which slides along a flat inclined surface.At an instant when the sled's acceleration has a horizontal component of 6.0 m/s² and a downward component of 2.8 m/s²,what is the magnitude of the force on the rider by the sled?

A horizontal uniform meter stick supported at the 50-cm mark has a mass of 0.50 kg hanging from it at the 20-cm mark and a 0.30 kg mass hanging from it at the 60-cm mark.Determine the position on the meter stick at which one would hang a third mass of 0.60 kg to keep the meter stick balanced.

If M = 2.0 kg,what is the tension in string 1?

Exhibit 5-2 A 4.00 kg block is suspended from the roof of an elevator.A 2.00 kg block is suspended from the 4.00 kg block.The tensions in strings 1 and 2 are labeled $\vec { T } _ { 1 }$ and $\vec { T } _ { 2 }$ Use this exhibit to answer the following question(s). -Refer to Exhibit 5-2.When the elevator accelerates upwards with an acceleration of 2.20 m/s²,the magnitudes of $\vec { T } _ { 1 }$ and $\vec { T } _ { 2 }$ are

A chair is placed on a rug.Then a book is placed on the chair.The floor exerts a normal force

The vector sum of three co-planar forces

When an acrobat hangs motionless from a pair of rings

You have a machine which can accelerate pucks on frictionless ice.Starting from rest,the puck travels a distance x in time t when force F is applied.If force 3F is applied,the distance the puck travels in time t is

In the figure,if F = 2.0 N and M = 1.0 kg,what is the tension in the connecting string? The pulley and all surfaces are frictionless.

A box rests on the (horizontal)back of a truck.The coefficient of static friction between the box and the surface on which it rests is 0.24.What maximum distance can the truck travel (starting from rest and moving horizontally with constant acceleration)in 3.0 s without having the box slide?

When you drag a toy teddy bear along the floor by a force that is parallel to the floor,the magnitude of the force of friction

You throw a ball up in the air and hold your hand under it to catch it when it comes down.The reason why the ball stops is because

You hold a tennis racket in your hand.On top of the racket you have balanced a ball.Which statement is true?

A book is resting on a table.How many forces would be in the free-body diagram of the book?

A uniform 120-lb beam is supported in a horizontal position by a pin and cable as shown in the figure.What is the magnitude of the force by the pin on the beam?

Which of the following is not a fundamental force?

The only two forces acting on a body have magnitudes of 20 N and 35 N and directions that differ by 80 $\degree$ .The resulting acceleration has a magnitude of 20 m/s².What is the mass of the body?

Which type of force would be the equal and opposite force to a gravitational force?