Physics 214 Practice Final Exam A Fill in on the OPSCAN sheet: 1) Name 2) Student identification number 3) Exam number as 02 4) Sign the OPSCAN sheet Important: This test consists of 30 multiple choice problems, each worth 6.667 points. Instructions: For each problem, choose the one answer that is correct or most nearly correct. Make a small mark, for your eyes only, near the letter of your choice. After you finish and check all the multiple-choice problems, transfer your answers to the computer sheet. Then, until you hand in the computer sheet, turn the sheet over and leave it face down. Only answers on the computer answer sheet will be graded. As your OPSCAN answer sheet will not be returned, record the answers on the test paper that you will keep. The correct answers will be displayed on the course web page, and you can find your score for this exam on CHIP. This is a closed book exam, but a crib sheet is provided. You may also use a calculator. Any form of cheating will result in severe penalties, which will include a score of zero for this exam and may result in a grade of F for the course and referral to the Dean of Students. All electronic devices must be securely put out of sight and may not be touched during the exam. All cell phones and pagers must be turned off. The only items you are allowed are the exam, the opscan sheet, a pencil and a calculator

FORMULAE AND CONSTANTS

CONVERSION FACTORS 1 inch = 2.54 cm 1 ft = 30.5 cm 1 m = 3.281 ft 1 km = 0.621 miles 1 mile = 5280 ft 1 nautical mile = 1.1508 miles 1 kg = 2.205 lbs (where g = 9.8 m/s2)

EQUATIONS s = d/t average speed s = d/t instantaneous speed v = d/t (vector) instantaneous velocitya = v/t (vector) acceleration v = v0 + at d = v0t + at2d = (v + v0)t F = ma (vector) force W = mg weight

a = v2/R centripetal acceleration F = mv2/R centripetal force F = GM1M2/R2 gravitational force W = Fd work P = W/t power KE = mv2 kinetic energy PE = mgh potential energy PE = kx2 potential energy P = mv momentum Ft = Pf Pi = p impulse Fexternal = 0, p = 0 momentum conservation

Circumference = 2R circle g = 9.8 m/s2 accn of gravity G = 6.67 10-11Nm2/kg2 gravitational constant = 3.14159 = /t = /t angular velocity = /t angular acceleration = 0t + t = 0t + t2Torque = F = L = I angular momentum = I torque & moment of inertia external = 0 Lf Li = 0 cons of ang momentum

P = F/A (pressure) P = gh (liquid) = m/V kg/m3

PA = 1.01 x 105 Pas Buoyant force = weight of liquid displaced

U = Q W (internal energy) PV = NkT (for a gas) = W/QH (engine efficiency) = (TH TC)/TH (Carnot efficiency)

TC = 5/9(TF-32) TF = (9/5)TC +32 (0C = 273.2K)

1 calorie = 4.186 joules Q = mcT c = 1 cal/gm/C for water 0.49 cal/gm/C for ice Latent heat of vaporization for water = 540 cal/gm (heat required to turn water to steam at 100 0C) Latent heat of fusion for water = 80 cal/gm (heat required to melt ice at 0oC)

qe = -1.6 x 10-19C F = k q1q2/r2

k = 9 x 109N.m2/C2

E = F/q (electric field) V = PE/q (potential difference) V = Ed (uniform E)

I = q/t amps R = V/I ohms R = R1 + R2 + R3 (series) 1/R = 1/R1+1/R2+1/R3 (parallel) P = I = I2R watts (power)

EQUATIONS Chapters 14 - 19

MAGNETISM F/ = (2k'I1I2)/r Parallel Wires k' = 1 x 10-7 N/A2

F = qvBperp Charged Particle =BA Flux E = /t Induced EMF V2 = V1(N2/N1) Transformer

WAVES v = f = /T v = F/ wire vsound = 340m/s c = 3 x 108m/s light n = dy/x Two slit y = x/w Single slit m = dy/x Grating

NUCLEAR 2He4 alpha decay -1e0 beta decay 1e0 position decay

Name: __________________________ Date: _____________

1. A 100-pound sack of potatoes falls from an airplane. As the velocity of the falling sack increases, so does the air resistance on it. When the air resistance equals 100 pounds, the acceleration of the sack will be

A) infinite. B) 9.8 m/s2. C) 9.8 m/s. D) zero. E) 4.9 m/s2

2. An elevator is being lifted upward at a constant speed by a steel cable. All frictional forces are neglected. In this situation, forces on the elevator are such that

A) the upward force by the cable is greater than the downward force of gravity. B) the upward force by the cable is equal to the downward force of gravity. C) the upward force by the cable is smaller than the downward force of gravity. D) none of the above. (The elevator goes up because the cable is being shortened, not

because an upward force is exerted on the elevator by the cable.)

3. Two blocks of equal mass are connected by a string. The system is accelerated across a smooth horizontal surface by a force, F, supplied by a rubber band connected to the leading block. The tension in the connecting string will be

A) F B) F/2 C) 2F D) F4 E) F/3

4. For a body moving with constant acceleration, which of the following graphs will be a straight line?

A) Displacement versus time. B) Velocity versus time. C) Displacement versus velocity. D) Time versus displacement. E) Velocity versus displacement.

5. A car travels a distance of 80 km. For the first 30 minutes it is driven at a constant speed of 80 km/hr. The motor begins to vibrate and the driver reduces the speed to 40 km/hr for the rest of the trip. The average speed for the entire trip is:

A) 60.0 km/hr. B) 53.3 km/hr. C) 50.0 km/hr. D) 47.5 km/hr. E) 40.0 km/hr.

6. A light bulb is connected to a battery so that current flows through the bulb, which gives off light. Choose the correct statement:

A) The amount of charge going into the bulb equals the charge leaving the bulb. B) The bulb is converting electric charge into light. C) The amount of charge entering the bulb is greater than the amount of charge leaving the

bulb.

7. A current of 2.8A flows through a battery for 9min. How much charge in coulombs passes through the battery in that time?

A) 2212 B) 856 C) 1512 D) 632 E) 193

8. A 3 kg block of wood is floating in water. What is the magnitude of the buoyant force acting on the block in Newtons?

A) 29.4 B) 0 C) 21.3 D) 3 E) 14.7

9. *A transformer has 200 turns on the primary and 20 turns on the secondary. The primary is connected to a direct current source of 100 millivolts. The voltage in the secondary coil will be

A) 10 millivolts. B) 20 millivolts. C) 1000 millivolts. D) 4000 millivolts. E) zero.

10. *If the speed of sound is 1100 feet per second and a tuning fork oscillates at 440 cycles per second, what is the wavelength of the sound produced?

A) 11 feet B) 4.4 feet C) 0.4 feet D) 2.5 feet

11. *Two musical strings have the same length and tension, but string A has four times the mass of string B. The speed of a wave on string A is

A) one fourth the speed of a wave on string B. B) one half the speed of a wave on string B. C) twice the speed of a wave on string B. D) four times the speed of a wave on string B. E) the same as the speed of a wave on string B.

12. *The tension in a guitar string is 21% too high. The fundamental frequency will be A) 21% too high. B) 10% too high. C) unchanged. D) too low.

13. *Waves on a particular string travel with a velocity of 20 m/s. A high-speed photograph shows that successive peaks are 0.80 m apart along the string. The frequency of the waves is:

A) 25 Hz. B) 20 Hz. C) 16 Hz. D) 12 Hz. E) 8 Hz.

14. *An organ pipe of length 3.0 m has one end closed. The two longest possible wavelengths for standing waves inside the pipe are

A) 6 m and 3 m. B) 12 m and 6 m. C) 12 m and 4 m. D) 9 m and 6 m. E) 3 m and 1.5 m.

15. *A string is held taut between two supports 2.0 m apart. The two longest possible wavelengths for standing waves are:

A) 4 m and 2 m. B) 4 m and 3 m. C) 3 m and 1.5 m. D) 2 m and 1 m. E) 3 m and 2 m.

16. *A standing wave is set up on a string so that it has 5 nodes. If you start at the central node and move exactly one wavelength in either direction, you will wind up at

A) another node. B) an antinode. C) neither a node nor an antinode. D) Answer depends on the string mass per unit length.

17. *The atomic number of an atom is the number of A) electrons in the nucleus. B) protons in the nucleus. C) sum of protons and electrons in the atom. D) neutrons in the nucleus. E) sum of protons and neutrons in the atom.

18. *The principal characteristic that distinguishes one element from another is the A) number of protons is the nucleus. B) number of neutrons in the nucleus. C) combined number of protons and neutrons in the nucleus. D) number of variations in the electron configuration. E) size of the atom.

19. *The N14 nucleus consists of A) 14 neutrons. B) 14 protons. C) 21 protons and 7 electrons. D) 7 protons and 7 neutrons.

20. *The purpose of the moderator in a reactor is to A) provide cooling for the control rods. B) reduce the number of neutrons available for the chain reaction. C) to slow neutrons down so that they will be more likely to initiate fission reactions. D) separate the nuclear fuel from the spent products of fission.

21. A rider on a sled starts from an elevation of 100m. Ignoring friction what is her speed in meters/sec when she reaches the bottom of the hill?

A) 12.22 B) 23.56 C) 44.27 D) 55.8 E) 41.9

22. A student sitting on a frictionless stool rotating at a rate of 20 revs/minute holds two masses one in each hand. She changes her rotational inertia from I = 5.6kg.m2 to 2.7kg.m2. What is the new rotational speed in rpm?

A) 4.5 B) 9.6 C) 86.0 D) 41.5 E) 6.8

23. A railroad car with a mass of 12400kg and velocity 12m/s collides and couples with three identical cars that are at rest. If exxternal forces are ignored what is the final speed in m/s of the four cars?

A) 1.5 B) 3.0 C) 6.0 D) 9.0 E) 12.0

24. A refrigerator weighing 1500 N is to be lifted onto a truck bed that is 1.0 m above the ground. When pushed up a slanting ramp 2.0 m in length a force of only 800 N is required to move it at constant velocity. Comparing the work involved in lifting the refrigerator straight up to the work in pushing it along the ramp, there is

A) less work required when the ramp is employed. B) more work required when the ramp is employed. C) an equal amount of work is required in each case.

25. 458 cal of heat energy is added to 735 gm of a solid piece of material. If the temperature changes from 20 C to 27 C, what is the heat capacity of this material?

A) 0.62 cal/gm C B) 0.089 cal/gm C C) 0.19 cal/gm C D) 1.30 cal/gm C E) None of the above.

26. A force 8 N acts on a mass of 17 kg through a distance of 20 m. If the initial velocity of the mass is 8 m/s, what is the final velocity of the mass after the effect of the force?

A) 6.3 m/s B) 8.0 m/s C) 20.4 m/s D) 9.1 m/s E) None of the above.

27. A boat is floating in a fixed volume of water. The Captain throws the anchor over the side. What happens to the level of the water

A) It rises B) It falls C) It stays the same

28. *Two long parallel wires each carrying a current of 5 amps lie a distance 10cm from eachother. What is the magnetic force in Newtons exerted on one meter of wire by the other wire?

A) 5 x 10-5B) 5 x 10-7C) 5 x 10-6D) 5 x 10-4E) 5 x 10-3

29. * A coil of wire with 60 turns and area 0.02m2 lies with it's plane perpendicular to a magnetic field of magnitude 1.5T. The coil is rapidly removed in 0.2 seconds. What is the average value in volts of the induced volotage?

A) 0.15 B) 5.0 C) 4.5 D) .35 E) 9.0

30. *Carbon fourteen has a half life of 5730 years. How old, in years, would an object be if 31/32 of the original carbon fourteen has decayed.?

A) 5551 B) 183360 C) 28650 D) 22920 E) 54560

Answer Key

1. D 2. B 3. B 4. B 5. B 6. A 7. C 8. A 9. E

10. D 11. B 12. B 13. A 14. C 15. A 16. A 17. B 18. A 19. D 20. C 21. C 22. D 23. B 24. B 25. B 26. D 27. B 28. A 29. E 30. C