General Physics PHY110 Final Exam

Borough of Manhattan Community College, Science Department, General Physics, PHY110, Final Exam

The Borough of Manhattan Community College

The City University of New York

General Physics PHY 110  (course)                                                      Prof. Vasiliy S. Znamenskiy

Final Examination                                                                                               December 16, 2013

Student Last Name________________First Name________________Date_____________

1. A transformer has 100 turns of wire in the primary coil and 400 turns of wire in the secondary coil. The potential difference across the primary is 4 volts. What is the potential difference induced across the secondary coil?   A) 1 V,       B) 2 V,       C) 4 V,       D) 8 V,       E) 16 V.
2. What is the potential difference, induced in a straight wire 1 meter long? The wire moves with a speed of 3 meter per second perpendicularly to a magnetic field that has a magnetic flux density of 4 Tesla? The wire is also perpendicular to the magnet field.
   A) 2/3 N,             B) 3/4 V,             C) 8 N,              D) 12 V,             E) no solution
3. The current in two straight, parallel, fixed wires are in the same direction. If currents in the both wires are doubled, the magnitude of the magnetic force between the two wires
   A) decreases,    B) remain the same,     C) doubles,     D) quadruplicates,       E) no solution.
         
4. Identify the unknown fission fragment: ₀n¹ +  ₉₂U²³⁵ = ? + ₅₀Sn¹³⁰ + 4 ₀n¹

A)  ₄₂Mo¹⁰⁵,   B) ₄₂Mo¹⁰²,   C)  ₄₂No¹⁰²,    D) ₃₈Sr¹⁰²,   E) ₄₂Db¹⁰⁵

7. What amount of hydrogen has to be used in the chemistry reaction: 2H₂ + O₂ = 2H₂O to produce of 9 kg of water?   A) 1 kg,   B) 4 kg,   C) 2kg,   D) 0.5 kg,  E) 8 kg
8. Which statement is well defined and correct?
   A) 5 m is less than 10 kg,     B) 5 cm is less than 10 mm,    C) 5 mg is less than 10 μg,
   D) 5 m² is less than 10 m³,    E) 5 kHz is less than 10 MHz
9. A car with a mass of 8000kg collides and couples with a second car of mass 4000kg that is initially at rest. The first car is moving with a speed of 3m/s prior to the collision. If external forces can be ignored, what is the final velocity of the two cars after they couple?
   A) 1m/s             B) 1.5m/s                 C) 2m/s                D) 6m/s                  E) No solution
10. A torque of 5 N·m producing a counterclockwise rotation  is applied to a wheel about its axle. A frictional torque of 1 N·m acts at the axle. If the wheel is observed to accelerate at the rate of 8 rad/s² under the influence of these torques, what is the rotational inertia of the wheel?
    A) 6 N·m           B) 0.5 kg·m²             C) 4 N·m              D) 32 kg·m²           E) No solution
11. Symbol p in the Physics formula p=mv represents:
    A) momentum,      B) power,                 C) phosphorus,      D) pressure,       E) dipole moment.
12. The volume of an ideal gas is increased from 10m³ to 20m³ while maintaining a constant pressure of 1000 Pa (1 Pa = 1 N/m²). How much work is done by the gas in this expansion?
    A) 3kJ             B) 7kJ                 C) 10kJ                         D) 200kJ                E) No solution
13. Symbol f in the Physics formula 1/o + 1/i = 1/f  represents:
    A) net force,    B) fluid pressure,    C) frequency,         D) friction,             E) focal length,      
14. What does the symbol c mean in the Physics formula: Q = cmΔT ?  
    A) speed of light, B) specific heat capacity, C) centripetal acceleration,
    D) conductivity, E) coulomb.
15. What is the weight of 70-g mass ( on the surface of the Earth)?
    A) 0.7 kN           B) 0.07 g               C) 7 N                    D) 700 N                E) 0.7 N
16. An object has a weight of 18N when it is locates on the surface of the Earth. What would it weight (the gravitational force due to the Earth) be if the object tripled its distance from the center of the Earth by flying in a spacecraft?
     A) 1 N               B) 2 N                    C) 3 N                   D) 6 N                     E) 1.8 kg
17. To stretch a spring a distance of 0.2 m, 40 J of work is done. What is the value of the spring constant k of the spring.
    A) 2 kN / m        B) 8m·J         C) 0.005 m^-1 kg^-1 s²        D) 200 newtons       E) No solution
18. An object with the mass 1.5kg are at the top of a hill a height of 20 m above the level ground below. The object is given a push providing an initial kinetic energy at the top of the hill of 500J.  If friction can be ignored, what will be the kinetic energy of the object at the bottom of the hill?
    A) 2000   J           B) 3.5 kJ              C)2.5 kJ                  D) 1.5 kJ                 E) 700 J
19. Ten coulombs of positive charge flow from the +9 V positive terminal of a battery to the negative terminal at +3 V. What is the change in potential energy of the charge?
    A) 90 J           B) 30 J                     C) 60 J                 D) -60 J                      E) No solution
20.  A 10-Ω resistor has a voltage difference of 2 V across its leads. What is the power being dissipated in this resistor?
    A) 0.4W            B) 20W                  C) 0.2W                D) 40W                 E) No solution
21. What is frequency of a sound wave with a wavelength of 0.34 m traveling in room-temperature air (v=340m/s)?
    A) 115.6 m² / s     B) 1 millisecond  C) 1 kHz              D) 1000                E) No solution
22. When passed through a diffraction grating with a slit spacing of 0.004 mm, the first order fringe for light of a single wavelength lies a distance of 60 cm from the center of a screen located 4 m from the grading. What is the wavelength of the light?
    A) 600nm          B) 0.06               C) 600km                  D) 240nm            E) No solution
23. The objective lens of a microscope has a focal length of 0.4 cm. An object on the microscope slide is placed at a distance of 0.5 cm from the lens.
    What is the magnification of this image?
    A) 4 m                B) 4                     C) 5/4                     D) 4/5                     E) No solution
24. Suppose that a photon has a wavelength of 600nm. What is frequency of this photon?
    A) 5·10¹²Hz        B) 5·10¹³Hz        C) 5·10¹⁴Hz             D) 5·10¹⁵Hz            E) No solution
25. How many half-lives must go by for the radioactivity of a given isotope to drop to 1/1024 of its original value?
    A) 8  half-lives    B) 9  half-lives    C) 10  half-lives     D) 11  half-lives     E) No solution
26. If an object has a volume of 8m³, what is the volume in cubic millimeters?
    A) 8000mm³      B) 8·10⁶mm³       C) 8·10⁹mm³           D)8·10^-9mm³           E)2000mm
27. A runner traveling with an initial velocity of 1 m/s accelerates at a constant rate of 1.5 m/s² for a time of 2 seconds. What is velocity at the and of this time.
    A) 4                   B) 4m/s                  C) 3                       D) 3m/s                   E) 7.5m/s
    
    
28. A ball rolls off a table with a horizontal velocity of 4m/s. If it takes 2 seconds for the ball to reach the floor. What is the magnitude of the vertical component of the ball's velocity just before it hits the floor.
    A) 24m/s           B) 20m/s                C) 16m/s               D) 20.4m/s              E) -20m/s
29. A ball is thrown downward with speed 15 m/s from the roof of a 30 m building. At the same instant a ball is thrown upward with speed 15 m/s from ground level. Relative to ground level, the two balls pass each other at a height of
    A) 0                    B) 5.0 m               C) 15 m                 D) 10 m                  E) 20 m
30. Symbol A in the Physics formula Φ = BA represents
    A) angular momentum, B) area, C) acceleration, D) amplitude, E) atomic number.
31. The fission fragment iodine-131 undergoes negative beta decay. Identify the daughter nucleus for the following reaction equation: ₅₃I¹³¹ => ? + _-1e⁰ + ₀ῡ⁰
    A)  ₅₄Xe¹³¹       B)  ₅₂Te¹³¹        C)  ₅₄I¹³¹                      D)  ₅₂Xe⁷⁹        E)  No solution
32. How many half-lives must go for the radioactivity of a given isotope to drop to one-sixty-fourth (1/64)  of its original value?
    A)  1 half-live,   B)  3  half-lives,   C)  6 half-lives,   D)  9 half-lives,   E)  No solution.
33. If carbon ( C ) with an atomic weight of 12, combines with oxygen (O) with an atomic weight of 16, to form carbon dioxide (CO₂) , haw many grams of carbon would react with 16g of oxygen?
34. A)  3g,          B)  6g,            C)  12g,       D)  24g,         E)  No solution
35. A tank holds 3 kL (kiloliters) of water. How many liters is this?
    A)  0.003 L,   B)  0.3000 L,   C)  3.000 L,    D)  3000 L,       E)  No solution
36. 12.34 kg = ?
    A)    12340,   B)  1.234x10⁴ g,   C)   1.2340 g,           D)   0.01234 g          E)  No solution
    
    
    
37. The velocity of a car changes from 2 m/s to 3 m/s in a time of 5 seconds. What is the average acceleration of the car in this process?
    30 m/s²            B)  15 m/s²      C)  10 m/s²     D)   0.2 m/s²      E)   0.1 m/s²
38. A bullet is fired horizontally with an initial velocity of 1000m/s at a target located 200 m from the rifle. Using the approximate value of g= 10m/s², how far does the bullet fall in this time?
    A)  0.2 m              B)  0.2 s             C)  0.4 m         D)    0.4              E)     200 m
39. An upward force of 20 N is applied via a string to lift a ball with a mass of 1 kg. What is the acceleration of the ball?
    A)  10 m/s²            B)  20m/s²          C)  10             D)  20                 E)    0.05 m/s²
40. A 50 kg woman in an elevator is accelerating upward at a rate of 2 m/s².  What is is the normal force pushing on the woman's feet?
    A)  100 N              B)  100 kg          C)  600 N       D)  600 kg          E)   25 N
41. A car with a mass of 1000kg is moving around a curve with a radius of 100 m at a constant speed of 10m/s. What is the magnitude of the force required to produce the centripetal acceleration of the car?
    A)  1000 kg            B)  500 N          C)  10m/s²      D)  1000 N          E)  10 N
42. A box with a mass of 2 kg is lifted without acceleration through a height of 6 m. What is the increase in potential energy of the box?
    A)  120 N                B)   120 J             C)     12 kg·m               D)   3 m/kg        E)  12 J
43. A ball traveling with an initial momentum of 2 kg m/s bounces off a wall and comes back in the opposite direction with a momentum of -2kg m/s. What is impulse is required to produce this change?
    A)   -4 N·s                B)  2 kg·m/s         C)  -2 kg·m/s                 D)  4 kg·m/s     E)  0 kg·m/s
44. A truck with a mass of 2000 kg traveling with a speed of 6 m/s collides at right angles with a car with a mass of 2000kg traveling with a speed of 8 m/s. The two vehicles stick together after the collision. What is the speed of the two vehicles after they collide?
    A)  8000kg              B)  5 m/s               C)  0.01 km/s                      D)  10           E)   No solution
45. Initial interaction force between two electric charges is equal to 8 N. If the distance between these charges increases two time, what is the final interaction force?
    A) 4N,                       B) 2N,                   C) 32N,                      D) 16N,                      E) 1/4N
46. A net torque of 100 N·m is applied to a disk with a rotational inertia of 10 kg·m² . What is rotational acceleration of the disk?
    A)   10 Hz                  B)  10 s²               C)  10s^-2                      D)  1000 1/s²              E)  1000
47. A rock with a volume of 2.0m³ is fully submerged in water having a density of 1.0g/cm³. What is the buoyant force acting on the rock?
    A)   2.0·10³ kg            B)  2.0·10⁴ N                C)  2.0 N               D)   0.5 g·m³/cm³   E)   50 N
48.  Work of 600 J is done by stirring an insulated beaker containing 100 g of water. What is the change in the internal energy of the system?
    A)  6 J/g                      B)  6·10⁴ J·g                  C)  1/6 g/J             D)  0.6 kJ               E)  600
    
    
49. You place an unknown liquid in a 25 gram beaker. The total mass of the liquid and the beaker is 43 grams. The mass of the unknown liquid is:
    A) 8 gram,     B) 18 gram,     C) 80 N,     D) 180 N,     E) No solution   
    
    
50. After introducing a 5 gram-object into a graduated cylinder, the volume in the cylinder increased from 15ml to 19ml. Based on this information, the density of the object is:
    A) 1.25 g/ml,     B) 4 g/ml,     C) 5 g/ml,     D) 15 g/ml,     E) 19 g/ml
    
              
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