1. Which of the following represents the vector sum of vector Q and vector R? 5 страница

⇐ ПредыдущаяСтр 5 из 6Следующая ⇒

When an instrument plays a note, the resulting sound is a combination of all the possible harmonics for that instrument in its momentary configuration. For instance, a musician changes notes on a violin by pressing the strings against the neck of the instrument, thus shortening the string length and changing the possible harmonics. A given shortened string will play at one time all the possible harmonics allowable by its string length. A given note is the same set of harmonics for all instruments. The diagram below shows the sound waves of the same note played by three different instruments.

(A) The period for the second harmonic is half as great.

(B) The period for the second harmonic is the same.

(D) The period for the second harmonic is four times as great.

(E) None of these.

25. When is the force on the mass due to the spring the greatest?

A mass m is suspended by a spring with a spring constant k. The rest length of the spring is x₀, and it oscillates a distance above and below its rest position. A very long string with a mass per unit length . and constant tension T is attached to the mass as shown. The moving mass creates a wave on the string with a wavelength , a frequency f, an amplitude A, and a velocity v.

(A) When the mass is at x_0.

(B) When the mass is at its maximum height

(D) The force on the mass due to the spring is constant.

(E) None of these.

26. Which of the following will result in the greatest increase in the observed frequency of sound?

(A) The source moves toward the observer at 30 m/s.

(B) The observer moves toward the source at 30 m/s.

(D) A and B will result in exactly the same frequency change.

(E) None of these.

27. Two positively charged masses are separated in deep space by a distance r. At this distance, the force of gravity happens to exactly counter the electrostatic force. At what other distance could this phenomenon be reproduced?

(A) This phenomenon would occur only at r and at no other distance.

(B) At 0.5 r

(D) If the forces are equal at r, the forces must be equal at all distances.

(E) None of these.

28. What is the voltage across the 2 ohm resistors and the current through either 2 ohm resistors?

(A) 70 V, 35 A

(B) 112 V, 66 A

(D) 80 V, 20 A

(E) 80 V, 80 A

29. What is the effective capacitance of the three capacitor unit below?

(A) 1/3

(B) 1

(D) 9

(E) 10

30.Which of the following most likely represents the force F on an electron within the coil as a function of ?

A conducting coil is rotated at a constant speed in an external magnetic field as shown. A current is generated wit hin the loop. T represents the time required for the loop to make one full rotation.

(A)

(B)

(C)

(D)

(E) None of these.

TEST 09

2. A particle starts from rest and accelerates at 10 m/s². How long does it take for the particle to reach a velocity of 45 m/s?

(A) 2 s

(B) 3 s

(D) 45 s

(E) 60 s

3. If the graphs shown are displacement versus time graphs, which graph represents a particle with positive velocity?

(A) W only

(B) X and Z only

(D) all graphs

(E) W, X, and Y only

4. A bullet is fired from a high powered rifle at target 20 meters away. The bullet will begin to fall:

(A) the moment it leaves the barrel of the rifle.

(B) the moment it reaches terminal velocity.

(D) The bullet will travel horizontally until it strikes the target.

(E) none of these

5. Which of the following would most likely experience the greatest force of air resistance if dropped from an airplane?

(A) a feather

(B) an elephant

(D) a toaster

(E) all of these

6. A 3 kg box is pushed along the ground at a constant velocity for 10 s. What is the net force acting on the box?

(A) 0 N

(B) 0.3 N

(D) 30 N

(E) 50 N

7. If is 30° m, d is 10 m, and x is 10 m, how long after the mass reaches the bottom of the plane does it require to move the distance x?

The question refers to the frictionless inclined plane shown below, h is the height of the ramp, d is the total length of the ramp, and 0 is the angle the ramp is placed from the horizontal. (Note: the distance x is also frictionless.)

(A) 1 s

(B) 2 s

(D) 4 s

(E) 5 s

8. A 2 kg object is placed on a plane inclined at an angle of 30°. If the coefficient of static friction is 1, and the coefficient of kinetic friction is 0.1, what is the net force on the block?

(A) 0 N

(B) 2.7 N

(D) 37.3 N

(E) 50 N

9. A 2 kg mass is placed on top of a spring (k = 400 N/m). How many centimeters is the spring compressed from its relaxed position?

(A) 0.05 cm

(B) 1 cm

(D) 5 cm

(E) 10 cm

10. If m = 10 kg, = 60° and = 30°, the tension T₃ is:

(A) 50 N

(B) 100 N

(D) 237 N

(E) 300 N

11. The crane shown below has mass of 4,000 kg and a base of 3.4 m. The arm of the crane is 22 m and attaches to the center of the crane. If the arm is placed at an angle of 30°, what is the largest mass that the crane can hold off the ground without tipping?

(A) 400 kg

(B) 440 kg

(D) 40,000 kg

(E) 44,000 kg

12. Force F is 100 N, m is 10 kg, and is 30°. The coefficient of friction between the block and the surface is 0.1. If the block starts from rest, and is pushed for 5 m, what is the approximate final velocity of the block?

(A) 0m/s

(B) 4.5 m/s

(D) 7.9 m/s

(E) 9.8 m/s

13. In 50 min utes a forklift lifts twenty-five 60 kg boxes from the floor onto a shelf 2 m high. What is the minimum power of the forklift?

(A) 2 W

(B) 10 W

(D) 6000 W

(E) 9,000 W

14. A ball falls from a height of 10 M. If it makes a perfectly elastic collision with the level ground, how high will it bounce? (Assume that the ground is infinitely heavier than the ball)

(A) 0 m

(B) 5 m

(D) infinitely high

(E) none of these

15. Which of the following statements is true if the mass is at rest at t = 0?

(A) The velocity of the mass is decreasing between 10 and 20 seconds.

(B) The acceleration of the mass is constant between 0 and 10 seconds.

(D) The distance traveled by the mass between 0 and 10 seconds is equal to the distance traveled by the mass between 10 and 20 seconds.

(E) None of these.

16. A very strong man stands on a table as shown and pulls up on the edge. Which of the following is true if the table does not break?

(A) If the man pulls hard enough, the end of the table on which he is pulling will rise.

(B) The man’s center of gravity must be on the other side of the table’s center of gravity. Then, if he pulls hard enough, the end of the table on which he is pulling will rise.

(C) The man’s center of gravity must be on the other side of the left table leg. Then, if he pulls hard enough, the end of the table on which he is pulling will rise.

(D) No matter how hard the man pulls, the table will remain motionless as long as his weight pushes down on the table.

(E) None of these

17.²¹⁸Po undergoes one alpha decay and two beta decays to make:

(A) ²¹⁴Po

(B) ²¹⁴Pb

(D) ²¹⁰Pb

(E) ²¹⁸Po

18. A mass is placed on the moveable piston of each of the cylinders shown. Which phase(s) will experience a significant change in volume?

I. solid

II. liquid

III. gas

(A) III only

(B) II and III only

(D) None of the volumes will change significantly.

(E) I and III only

19. If the values of ₁, ₂, ₃, and ₄ are 500 kg/m³, 1000 kg/m³, 2000 kg/m³, and 4000 kg/m³, respectively, then what is the approximate pressure at P₂?

Four fluids with different densities are held in an open container. Each fluid has a depth of 10 m. P₁, P₂, and P₃ are points in the container.

(A) 5.5 atm

(B) 6.5 atm

(D) 8.5 atm

(E) 10.5 atm

20. Which of the following represents the volume flow rate at a, b, and c?

An ideal fluid with a specific gravity of 1.0 flows through the pipe in the direction from c to a. The pipe has the same diameter at a and c. The vertical pipes are vacuum sealed at the top. The height of the fluid at h₁, h₂, and h₃ are measured from the center of the pipe, and are not drawn to scale.

(A) a > b > c

(B) a = c > b

(D) b = a = c

(E) c > b > a

21. Below is a fluid in a glass tube. If the fluid molecules bond more strongly to the glass than to each other, which of the following represents the fluid in the tube?

(A)

(B)

(C)

(D)

(E) None of these.

22. If the frequency of a wave is 200 Hz, and the velocity is 10 m/s, what is the wavelength?

(A) 0.05 m

(B) 0.5 m

(D) 2000 m

(E) 5000 m

23. The intensity of a wave will be most increased by an increase in which of the following?

(A) wavelength

(B) amplitude

(D) velocity of the wave.

(E) All of these.

24. How does the period of the third harmonic for the note played by the oboe compare with the period of the wave form shown?

(A) The period for the third harmonic is one fourth as great.

(B) The period for the third harmonic is one third as great.

(D) The period for the third harmonic is the same.

(E) None of these.

25. Which of the following is a graph of the kinetic energy of the mass versus x?

(A)

(B)

(C)

(D)

(E) None of these.

26. Humans can detect sound waves at a maximum frequency of 20 kHz. A certain dog whistle emits a frequency of 22 kHz. A person in a moving car blows the dog whistle. A second person standing by the road might hear the dog whistle if: (Note the speed of sound in air is 340 m/s.)

(A) the car is moving away from him at 34 m/s

(B) the car is moving toward him at 34 m/s

(D) A human could never hear a dog whistle because the frequency is too high.

(E) None of these.

27. Positively charged particle A starts at rest and is pulled from a great distance directly toward negatively charged particle B by the electric field created by particle B. If particle A has a velocity v when it is a distance 4 r from particle B, what will be the velocity of particle A when it is a distance r from particle B?

(A) 0.5 v

(B) v

(D) 4 v

(E) 5 v

28. What is the voltage across the capacitor and the charge on the capacitor?

(A) 5 V, 10^-7 C

(B) 5 V, 10^-5 C

(D) 10 V, 10^-5 C

(E) 10 V, 10^-11 C

29. If a third resistor is added between A and B in the circuit below, what will happen to the effective resistance and the power used by the circuit?

(A) The effective resistance will decrease and the power willdecrease.

(B) The effective resistance will decrease and the power will increase.

(D) The effective resistance will increase and the power will increase.

(E) The effective resistance will increase and the power will be constant.

30. Which of the following would increase the current generated in the coil?

I. increasing the speed of rotation of the wire

II. increasing the size of the coil

III. increasing the strength of the magnetic field

(A) I only

(B) II only

(D) I, II, and III.

(E) I and III only

TEST 10

1. If, in Triangle 1, side A has a length of 16 cm and side C has a length of 20 cm, what is the length of side B?

(A) 9 cm

(B) 10 cm

(D) 16 cm

(E) 18 cm

2. A constantly accelerating particle reaches a 100 m/s. If its average velocity is 75 m/s, what was its initial velocity?

(A) 0 m/s

(B) 25 m/s

(D) 75 m/s

(E) 100 m/s

3. If the graphs shown are velocity versus time graphs, which graph could represent a particle with positive velocity?

(A) W only

(B) X only

(D) All graphs

(E) W, X and Y only

4. A projectile is launched at a 30° angle over flat ground. Ignoring air resistance, which of the following is NOT true when the projectile reaches its maximum height?

(A) Its vertical velocity is zero.

(B) Its horizontal velocity has not changed.

(D) The instantaneous acceleration is zero.

(E) none of these

5. Which of the following is not one of the four fundamental forces in nature?

(A) gravitational

(B) electromagnetic

(D) strong nuclear

(E) weak

6. Universal Gravitation to solve for force in the diagram above. His answer is F = 10 N. If m₁ and m₂ have the same mass, which of the following is true?

Objects m₁ and m₂ are two objects in space infinitely far from any other mass. (G= 6.67 Nm²/kg²)

(A) Objects m₁ and m₂ each experience a force of 5 N.

(B) Objects m₁ and m₂ each experience a force of 10 N.

(D) The forces on objects m₁ and m₂ cancel each other and neither mass experiences a net force.

(E) None of these

7. Which of the following would change the acceleration of object m if it were released from the top of the ramp?

(A) changing the shape of the object to a sphere

(B) changing the mass of the object

(D) releasing the object from the middle of the ramp

(E) none of these

8. A 2 kg object is placed on a plane inclined at an angle of 30°. If the coefficient of static friction is 0.3, and the coefficient of kinetic friction is 0.1, what is the net force on the block?

(A) 0 N

(B) 8.3 N

(D) 20 N

(E) 30 N

9.A 2 kg mass is placed on top of a spring (k = 400 N/m) and then pushed downwards with a force of 30 N. How many centimeters is the spring compressed from its relaxed position?

(A) 0.5 cm

(B) 5 cm

(D) 12.5 cm

(E) 15 cm

10. If m = 10 kg, = 60° and = 30°, the tension T₂ is:

(A) 50 N

(B) 59 N

(D) The tension T₂ depends upon the length of T₂.

(E) The tension T₂ depends upon the length of T₁.

11. A 10 m board with a weight hangs by two ropes as shown below. If the board has a mass of 20 kg, what is the tension T₂?

(A) 50 N

(B) 100 N

(D) 200 N

(E) 250 N

12. If the mass m, starting from rest, slides a distance d in time t, accelerating to a velocity v, which of the following does represent the work done by gravity?

(A) mgh^v

(B)

(D) mgh

(E) mgdv

13.A 5,000 kg rocket moves straight up at 30 m/s near the earth’s surface. What is the minimum power of the rocket’s engines?

(A) 6 W

(B) l0⁶ W

(D) 3.0 l0⁶ W

(E) 4.0 l0⁶ W

14. A small object moving at 10 m/s to the right collides with a heavier object that is initially stationary. Which of the following is a possible velocity of the smaller object after the collision?

(A) 10 m/s to the right

(B) 5 m/s to the right

(D) 12 m/s to the left

(E) 24 m/s to the left

15. Two 1 kg lumps of clay sit in some mud. A boy picks up one lump of clay and drops it onto the second lump from a height of 1 m. The lumps stick together when they collide. If the second lump is driven into the mud a distance of 1 cm, what is the average force exerted on the mud?

(A) 500N

(B) 520 N

(D) 1,020 N

(E) 5,020 N

16. The crane below uses a steel cable to lift one end of a 1,000 kg iron sheet as shown. If the sheet is 10 m long and of uniform density, what is the minimum tension in the cable?

(A) 5,000 N

(B) 10,000 N

(D) 50,000 N

(E) 98,000 N

17.²²²Rn decays once to form ²¹⁸Po. What type of particle is emitted?

(A) a gamma particle

(B) an alpha particle

(D) a positron

(E) none of these.

18. A mass is placed on the moveable piston of each of the cylinders shown. Which phase(s) will experience a significant change in density?

I. solid

II. liquid

III. gas

(A) III only

(B) II and III only

(D) None of the volumes will change significantly.

(E) I and III only

19. An object completely submerged in a fluid with a specific gravity of 3 has an apparent loss of weight of 40 N. If the mass of the object is 12 kg, what is its specific gravity?

(A) 3

(B) 6

(D) 12

(E) 15

20. If a second ideal fluid with a specific gravity of 2.0 were passed through the pipe at the same volume flow rate the pressure at any point in the pipe would:

Дата добавления: 2015-11-04; просмотров: 27 | Нарушение авторских прав

⇐ Предыдущая 1 2 3 456 Следующая ⇒

mybiblioteka.su - 2015-2024 год. (0.101 сек.)

<== предыдущая лекция

следующая лекция ==>