# A b cos c sin d sin e sin 4 two 4 kg blocks hang from

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AP_Physics_C_Forces_Test_2015

1 .   The maximum mass that can be hung vertically from a string without breaking the string is 10 kg . A length of this string that is 2 m long is used to rotate a 0.5 kg object in a circle on a frictionless table with the string horizontal . The maximum speed that the mass can attain under these conditions without the string breaking is most nearly
( A ) 5 m/s (
B ) 10 m/s (
C ) 14 m/s (
D ) 20 m/s (
E ) 100 m/s
2 .   Three blocks , A , B , and C , of masses 1 , 2 , and 3 kg , respectively , are initially at rest on a frictionless surface as indicated in the figure above . What force F has to be applied on block C to accelerate the three blocks at 2 ? ? 2 ⁄ ?
3 .   A block of mass m is pulled across a rough surface , as shown above . The coefficient of friction between the block and the surface is ? ? . The force F that pulls the block is exerted at the angle ? shown . Which of the following is an expression for the magnitude of the frictional force on the block if it is moving at constant speed ?
4 .   Two 4 kg blocks hang from a rope that passes over two frictionless pulleys , as shown in the figure above . What is the tension in the horizontal portion of the rope if the blocks are not moving and the rope and the two pulleys have negligible mass ?
5 .   A person throws a ball of mass 0.20 kg . The ball starts from rest , accelerates horizontally and uniformly through a distance of 0.90 m , and leaves the person ’s hand at 30 m/s . The average horizontal force applied to the ball by the person ’s hand is
( A ) 3.3 N (
B ) 16.7 N (
C ) 81 N (
D ) 100 N (
E ) 200 N
6 .   A force F accelerates a system of two blocks , X and Y , on a horizontal frictionless surface , as shown above . The acceleration is 4 ? ? 2 ⁄ . The force with which block Y pushes on block X has magnitude
7 .   A uniform beam of weight W is attached to a wall by a pivot at one end and is held horizontal by a cable attached to the other end of the beam and to the wall , as shown above . T is the tension in the cable , which makes an angle ? with the beam . Which of the following is equal to T ?
8 .   The rope - and - pulley system of negligible mass shown above supports a block of weight W that is at rest . If the tension throughout the rope is uniform , what is the reading on the spring scale ?
9 .   A uniform beam of mass m is pivoted at one end and held in equilibrium at an angle q by a horizontal wire , as shown above . The tension T in the wire is
( A ) 1 2 ?? cot ? (
B ) ?? cot ? (
C ) ?? tan ? (
D ) 2?? tan ? (
E ) ??
10 .   A 2.0 - kg cart rolls with negligible friction on a horizontal surface , as shown in the figure above . The coefficient of static friction between the cart and the 1 - kg block on top of the cart is 0.7 . If a horizontal 15N force is applied to the cart as shown and the block does not slide on the cart , the magnitude of the horizontal component of the force that the block exerts on the cart is most nearly
.   For the car not to slide on the road , which of the following statements must be true ?
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Chapter 11 / Exercise 82
Multivariable Calculus
Larson Expert Verified
expression for the magnitude of the frictional force on the block if it is moving at constant speed? (A) 𝜇𝑘𝑚𝑔(B) 𝜇𝑘𝐹 cos𝜙(C) 𝜇𝑘(𝐹 sin 𝜙 + 𝑚𝑔)(D) 𝜇𝑘(𝐹 sin 𝜙 − 𝑚𝑔)(E) 𝜇𝑘(𝑚𝑔 − 𝐹 sin𝜙)
4. Two 4 kg blocks hang from a rope that passes over two frictionless pulleys, as shown in the figure above. What is the tension in the horizontal portion of the rope if the blocks are not moving and the rope and the two pulleys have negligible mass?
(E) 80 N 5. A person throws a ball of mass 0.20 kg. The ball starts from rest, accelerates horizontally and uniformly through a distance of 0.90 m, and leaves the person’s hand at 30 m/s. The average horizontal force applied to the ball by the person’shand is
##### We have textbook solutions for you!
The document you are viewing contains questions related to this textbook. The document you are viewing contains questions related to this textbook.
Chapter 11 / Exercise 82
Multivariable Calculus
Larson Expert Verified
6. A force F accelerates a system of two blocks, X and Y, on a horizontal frictionless surface, as shown above. The acceleration is 4 𝑚 𝑠2. The force with which block Y pushes on block X has magnitude
7. A uniform beam of weight W is attached to a wall by a pivot at one end and is held horizontal by a cable attached to the other end of the beam and to the wall, as shown above. T is the tension in the cable, which makes an angle with the beam. Which of the following is equal to T 𝑊𝑊cos𝜃(D) 𝑊sin𝜃(E) 𝜃? (A) 2cos𝜃(B)2sin𝜃(C)
𝑊
𝑊
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