Physical Setting 18 June 1999 Questions Answer Keys

**The University of the State of New York**

Regents High School Examination

Physical Setting

Physics

Friday, June 18, 1999 – 1:15 P.M to 4:45 PM, Only

**Directions (1–30):** For each statement or question, select the word or expression that, of those given, best completes the statement or answers the question. Record your answer on the separate answer paper in accordance with the directions on the front page of this booklet.

**1. As shown in the diagram below a painter climbs 7.3 meters up a vertical scaffold from A to B and then walks 11.0 meters from B to C along a level platform.**

The Magnitude of the painter’s total displace-ment while moving from A to C is

- (1) 3.7 m
**(2) 13.2 m**- (3) 18.3 m
- (4) 25.6 m

**2. A truck with an initial speed of 12 meters per second accelerates uniformly at 2.0 meter per second ^{2 }for 3.0 second. What is the total distance traveled by the truck during this 3.0 second interval?**

- (1) 0.9 m
- (2) 25 m
- (3) 36 m
**(4) 45 m**

**3. the mass of physics textbook is closest to**

- (1) 10
^{3 }kg - (2) 10
^{1 }kg **(3) 10**^{0 }kg- (4) 10
^{-2}kg

**4. A 1.2 × 10 ^{3} – kilogram car is accelerated uniformly from 10 meters per second to 20 meter per second in 5.0 seconds. What is the magnitude of the net force acting on the car during this 5.0 second interval?**

**(1) 2.4 × 10**^{3}N- (2) 4.8 × 10
^{3}N - (3) 7.2 × 10
^{3}N - (4) 1.2× 10
^{4}N

Base your answer to question 5 and 6 on the graph below, which represents the relationship between the displacements of an object and its time of travel along a straight line.

**5. What is the magnitude of object’s total displacement after 8.0 seconds?**

**(1) 0 m**- (2) 2 m
- (3) 8 m
- (4) 16 m

**6. What is the average speed of the object during the first 4.0 seconds?**

- (1) 0 m/s
**(2) 2 m/s**- (3) 8 m/s
- (4) 4 m/s

**7. Which combination of three concurrent forces acting on a body could not produce equilibrium?**

**(1) 1 N, 3 N, 5 N**- (2) 2 N, 2 N, 2 N
- (3) 3 N, 4 N, 5 N
- (4) 4 N, 4 N, 5 N

**8. If a thirty 30-newton forces required accelerated a 2 kilogram object at 10 meter per second ^{2, }over a level floor, then the magnitude of the frictional force acting on the object is**

- (1) 0 N
**(2) 10 N**- (3) 20 N
- (4) 30 N

**9. The diagram below shows a student applying a 10.-newton force to slide a piece of wood at constant speed across a horizontal surface. After the wood is cut in half, one piece is placed on the top of the other, as shown.**

What is the magnitude of the force, F, required to slide the stacked wood at constant speed across the surface?

- (1) 40. N
- (2) 20. N
**(3) 10. N**- (4) 5.0 N

**10. In the diagram below, a block rests on the ramp, making angel θ with the horizontal.**

If angle θ increased, what will occurs?

- (1) The block’s mass will decrease
- (2) The block’s weight will increase
- (3) The block’s component of weight parallel to the ramp will decrease
**(4) The block’s component weight parallel to the ramp will increase**

**11. Which combination of fundamental units can be used to express the weight of an object?**

- (1) kilogram/second
- (2) kilogram•meter
- (3) kilogram•meter/second
**(4) kilogram•meter/second**^{2}

**12. What is the momentum of a 10 ^{3 }–kilogram car as it travels at 30. Meter per second due east for 60. Seconds?**

**(1) 4.5 × 10**^{4 }kg.m/s, east- (2) 4.5 × 10
^{4 }kg.m/s, west - (3) 4.5 × 10
^{6 }kg.m/s, east - (4) 4.5 × 10
^{6 }kg.m/s, west

**13. The Graph below shows the relationship between weight and mass for a series of object of moon.**

The acceleration due to gravity on the moon is approximately.

- (1) 0.63 m/s
^{2} **(2) 1.6 m/s**^{2}- (3) 9.8 m/s
^{2} - (4) 32 m/s
^{2}

**14. A 2.0 × 10 ^{3}-kilogram car collides with a tree and its brought to rest in 0.50 second by an average force of 6.0 × 10^{4 }Newton’s. What is the magnitude of impulse on the car during this 0.5- second interval?**

- (1) 1.0 × 10
^{3 }kg•s **(2) 1.2 × 10**^{5 }N/s- (3) 3.0 × 10
^{4 }N•s - (4) 6.0 × 10
^{4 }N•kg•s

**15. The diagram below shows a child pulling a 50 -kilogram friend on a sled by applying a 300 -newton force on the sled rope at an angle of 40 ^{0} with the horizontal**

The vertical component of the 300 -Newton force is approximately

- (1) 510 N
- (2) 320 N
**(3) 190 N**- (4) 32 N

**16. Which graph best present relationship between the mass (m) of a satellite launched from Earth and the satellite’s distance (r) away from the earth?**

**17. A 6-newton force and an 8-newton force act concurrently on a box located on a friction less horizontal surface. Which top-view diagram shows the surface producing the smallest magnitude acceleration of the box?**

**18. In the diagram below, a 100-kilogram clown is fired from a 500-kilogram cannon.**

If the clown speed is 15 meter per second after the firing, then the recoiled speed (v) of the cannon is

- (1) 75 m/s
- (2) 15 m/s
**(3) 30 m/s**- (4) 0 m/s

**19. A girl rides an escalator that moves her upward at constant speed. As the girl rises, how do her gravitational potential energy and kinetic energy change?**

- 1 Gravitational potential energy decreases and kinetic energy decreases.
- 2 Gravitational potential energy’ decreases and kinetic energy remains the same.
- 3 Gravitational potential energy’ increases and kinetic energy decreases.
**4 Gravitational potential energy increases and kinetic energy remains the same.**

**20. A student does 300. joules of work pushing a cart 3.0 meters due east and then does 400. joules of work pushing the cart 4.0 meters due north. The total amount of work done of the student is**

- (1) 100.1
- (2) 500. J
**(3) 700.J**- (4) 2500 J

**21. The unscratched spring in the diagram below has a length of 0.40 meter and spring constant k. A weight is hung from the spring. causing it to stretch to a length of 0.60 meter.**

How many joules of elastic potential energy are stored in this stretched spring?

**(1) 0.020 × k**- (3) 0.18 × k
- (2) 0.080 × k
- (4) 2.0 × k

**22. A spring has a spring constant of 25 newtons per meter. The minimum force required to stretch the spring 0.25 meter from its equilibrium posit ion is approximately**

- (1) 10 × 10
^{-4 }N - (2) 0.78 N
**(3) 6.3 N**- (4) 10 × 10
^{2 }N

**23. If the time required for a student to swim 500 meters is doubled, the power developed by the student will be**

**1 halved**- 2 doubled
- 3 quartered
- 4 quadrupled

**24. In the diagram below. an average force of 20. newtons is used to pull back the string of a bow 0.60 meter.**

As the arrow leaves the bow, its kinetic energy is

- (1) 3.4J
- (2) 6.OJ
**(3) 12J**- (4) 33J

**25. A Positively charged rod is held near the knob of a neutral electroscope. Which diagram best represents the distribution of charge on the electroscope?**

**26. Compared to the charge on a proton. the charge on an electron has the**

- 1 opposite sign and a smaller magnitude
**2 opposite sign and the same magnitude**- 3 same sign and a smaller magnitude
- 4 same sign and the same magnitude

**27. A point charge of +3.0 × 10 ^{-7} coulomb is placed 2.0 × 10^{-7} meters from a second point charge of +4.0 × 10^{-7} coulomb. The magnitude of the electrostatic force between the charges is**

**(1) 2.7 N**- (2) 5.4 × 10
^{-2} - (3) 3.0 × 10
^{-10} - (4) 6.0 × 10
^{-12}

Base your answers to questions 28 and 29 on the information and diagram below.

Two parallel plates separated by a distance of 1.0 x 10-^{3} meter are charged to a potential difference of 12 volts. An alpha particle with a charge of +2 elementary charges is located at point P in the region between the plates.

**28. What is the magnitude and direction of the elect ric field intensity between the plates?**

- (1) 1.2 × 10
^{3}V/m toward plate A - (2) 1.2 × 10
^{3 }V/m toward plate B - (3) 1.2 × 10
^{3}V/m toward plate A **(4) 1.2 × 10**^{3}V/m toward plate B

**29 .The electric field between the plates will cause the alpha particle, starting from rest at point P, to**

- 1 accelerate toward the positive plate
**2 accelerate toward the negative plate**- 3 move at constant speed toward the positive plate
- 4 move at constant speed toward the negative plate

**30. If 15 joules of work is required to move 3.0 coulombs of charge between two points. the potential difference between these two points is**

- (1) 45 V
- (2) 15 V
- (3) 3.0 V
**(4) 5.0 V**

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