[Placement Test] CU-ATS Physics
21 Questions, 30 Minutes
The use of a calculator is permitted.
21 Questions, 30 Minutes
The use of a calculator is permitted.
(A)
(B)
(C)
(D)
(E)
(F)
(A) 6.67 N
(B) 13.33 N
(C) 15.00 N
(D) 20.00 N
(E) 30.00 N
(F) I have no idea.
3. A 2-kg object is released from the top of an incline at the height of 3 m. When it reaches the bottom of the incline, its speed is 6 m/s. What is the work done by friction during the motion?
(A) 13.2 J
(B) 22.8 J
(C) 36.0 J
(D) 58.8 J
(E) 72.0 J
(F) I have no idea.
Questions 4 – 5
A truck with a mass of 4,000 kg and a constant velocity of 25 m/s went head-on collision with a car of mass m and a constant velocity of 40 m/s. Both car stopped as a result of the collision.
Questions 4 – 5
A truck with a mass of 4,000 kg and a constant velocity of 25 m/s went head-on collision with a car of mass m and a constant velocity of 40 m/s. Both car stopped as a result of the collision.
4. What is the value of m?
(A) 1000 kg
(B) 1500 kg
(C) 2000 kg
(D) 2500 kg
(E) 4000 kg
(F) I have no idea.
5. If each driver has a mass of 60 kg, which of the following is true?
(A) The impulse exerted on the truck driver is equal to the impulse exerted on the car driver.
(B) The impulse exerted on the truck driver is more than the impulse exerted on the car driver by 900 kg ∙ m/s.
(C) The impulse exerted on the truck driver is less than the impulse exerted on the car driver by 900 kg ∙ m/s.
(D) The impulse exerted on the truck driver is more than the impulse exerted on the car driver by 1,500 kg ∙ m/s.
(E) The impulse exerted on the truck driver is less than the impulse exerted on the car driver by 1,500 kg ∙ m/s.
(F) I have no idea.
(A)
(B)
(C)
(D)
(E)
(F)
7. According to the graph, which of the following must be true?
(A) The resultant force exerted on the object is non-zero and against the direction of the motion during 𝑡 = 0 to 𝑡 = 2.
(B) The resultant force exerted on the object is zero.
(C) The velocity of the object is constant.
(D) The velocity of the object is decreasing during 𝑡 = 0 to 𝑡 = 2.
(E) The velocity of the object is increasing during 𝑡 = 0 to 𝑡 = 2.
(F) I have no idea.
8. Two electric charges are separated by a distance of 8 cm and they exert electric force on each other. If the charges are moved and the electric force on each of them is quadruples, what is the new separation between the charges?
(A) 1 cm
(B) 2 cm
(C) 4 cm
(D) 16 cm
(E) 32 cm
(F) I have no idea.
(A) Into the page
(B) Out of the page
(C) Upward
(D) Downward
(E) The magnetic field at point P is zero.
(F) I have no idea.
(A)
(B)
(C)
(D)
(E)
(F)
(A) +X
(B) –X
(C) +Y
(D) –Y
(E) +Z
(F) I have no idea.
(A)
(B)
(C)
(D)
(E)
(F)
13. An observer is moving with velocity v0 toward a stationary sound source. Which of the followings is NOT correct?
(A) The sound heard by the observer is becomes louder and louder.
(B) The pitch of the sound heard by the observer becomes higher and higher.
(C) The wavelength of the sound is the same for both the observer and the source.
(D) The frequency of the sound detected by the observer is higher than that of the source.
(E) The speed of the sound wave relative to the observer is higher than relative to the source.
(F) I have no idea.
(A)
(B)
(C)
(D)
(E)
(F)
15. A magnifying lens and a round object are aligned to project the image of the object onto a screen. The magnifying lens and the object are 3.0 m and 4.5 m from the screen, respectively, and the diameter of the image shown on the screen is 2 times larger than that of the object. What is the focal length of the magnifying lens?
(A) 0.5 m
(B) 1.0 m
(C) 1.5 m
(D) 1.8 m
(E) 9.0 m
(F) I have no idea.
16. An iron cube of mass 15 kg and temperature 100 ℃ is put into water of mass 25 kg and temperature 20 ℃. Assume that there is not heat loss to the outside of the water tank. What is the final temperature of mixture? Let the specific heat capacities of iron and water be 0.45 J/g ∙ K and 4.20 J/g ∙ K, respectively.
(A) 83.2 ℃
(B) 52.4 ℃
(C) 24.8 ℃
(D) 18.2 ℃
(E) 15.0 ℃
(F) I have no idea.
(A)
(B)
(C)
(D)
(E)
(F)
18. What is the Carnot efficiency of the engine which operates between two heat reservoirs of temperature 1,500 K and 300 K?
(A) 20%
(B) 25%
(C) 60%
(D) 75%
(E) 80%
(F) I have no idea.
19. Given ℎ = 6.63 × 10−34 Js and ℎ𝑐 = 1240 eV ∙ nm. What is the longest wavelength of light that can emit photoelectron from a copper target? (work function = 4.7 eV)
(A) 5,200 nm
(B) 470 nm
(C) 270 nm
(D) 250 nm
(E) 124 nm
(F) I have no idea.
20. Determine the work function of a metal target that can emit photoelectron at the threshold when struck by infrared ray of wavelength 680 nm.
(A) 6.80 eV
(B) 6.63 eV
(C) 4.80 eV
(D) 3.40 eV
(E) 1.82 eV
(F) I have no idea.
(A) The electron will not absorb the energy from this photon and remain in the ground state.
(B) The electron will absorb the energy from the photon and rise to the first excited state.
(C) The electron will absorb the energy from the photon and rise to the second excited state.
(D) The electron will absorb the energy from the photon and rise to the third excited state.
(E) The atom will be ionized, i.e. the electron escapes the attraction of the nucleus.
(F) I have no idea.
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