SAT物理练习题3.

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Question 1: What is the magnitude of the vector 3A - B in the figure above? A.3 B.4 C.5 D.2 E.6

Question 2: The graph above shows the acceleration of a particle. At t = 0s, the speed of the particle is 1m/s. What is the speed of the particle at t = 4s? 11 m/s 9 m/s 19 m/s 13 m/s 10 m/s

Question 3: Forces F₁ and F₂ in the figure above act on a block of mass m = 10kg that moves on a frictionless surface. What is the acceleration of the block? 1 m/s 1.5 m/s 2 m/s 2.5 m/s 3 m/s

Question 4: A block of mass m is moving down an inclined plane with a decreasing speed. The coficient of friction between the block and the plane is μ. Which of the following statements is true? sin(α) < μ sin(α) > μ cos(α) < μ cos(α) > μ tan(α) < μ

Question 5: When a car&aposs kinetic energy increases 9 times, what happens with its speed? increases 9 times increases 3 times decreases 9 times decreases 3 times remains constant

Question 6: An object of mass 4kg is attached to a spring. The equilibrium position of the object is .4m from the point where the spring exerts no force on the object. What is the spring constant, k? 10 N/m 80 N/m 100 N/m 150 N/m 200 N/m

Question 7: An object of mass 10kg sitting on a frictionless horizontal plane is moved from a stationary state by the force shown above. What is the velocity of the object at time t = 5s? 2.5 m/s 3 m/s 4 m/s 5 m/s 6 m/s

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• Question 1: What is the magnitude of the vector 3A - B in the figure above? Solution: The magnitude of the vector 3A is 3 and the magnitude of vector B is 4. The angle between vectors 3A and B is 90^o. According to the Pythagorean theorem, the magnitude of 3A - B is 5.

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  • Question 2: The graph above shows the acceleration of a particle. At t = 0s, the speed of the particle is 1m/s. What is the speed of the particle at t = 4s? Solution: At t = 2s, the speed of the particle is v_2s = v_0s + 2m/s²·2s = 5m/s. At t = 4s, the speed of the particle is v_4s = v_2s + 3m/s²·2s = 11m/s.

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  • Question 3: Forces F₁ and F₂ in the figure above act on a block of mass m = 10kg that moves on a frictionless surface. What is the acceleration of the block? Solution: F₁cos(60^o) + F₂cos(60^o) = m·a 20·1/2 + 30·1/2 = 10·a 25 = 10·a a = 2.5m/s²

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  • Question 4: A block of mass m is moving down an inclined plane with a decreasing speed. The coficient of friction between the block and the plane is μ. Which of the following statements is true? Solution: mg sin(α) - � mg cos(α) = a The speed is decreasing so a < 0. This means that mg sin(α) - � mg cos(α) < 0 mg sin(α) < � mg cos(α) tan(α) < �

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  • Question 5: When a car&aposs kinetic energy increases 9 times, what hapens with its speed? Solution: The car&aposs initial kinetic energy is E_i = mv_i²/2 and the final kinetic energy is E_f = mv_f²/2. E_f/E_i = (v_f/v_i)² (v_f/v_i)² = 9 v_f/v_i = 3

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  • Question 6: An object of mass 4kg is attached to a spring. The equilibrium position of the object is .4m from the point where the spring exerts no force on the object. What is the spring constant, k? Solution: F = kx mg = kx k = mg/x k = 40N/.4m k = 100N/m

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  • Question 7: An object of mass 10kg sitting on a frictionless horizontal plane is moved from a stationary state by the force shown above. what is the velocity of the object at time t = 5s? Solution: The area under a force versus time graph gives us the impulse given to the object. p = 10/2 + 30 + 10/2 = 40 kg m/s v = p/m v = 4 m/s

转载请注明来自澳际留学

Question 1: What is the magnitude of the vector 3A - B in the figure above? A.3 B.4 C.5 D.2 E.6

Question 2: The graph above shows the acceleration of a particle. At t = 0s, the speed of the particle is 1m/s. What is the speed of the particle at t = 4s? 11 m/s 9 m/s 19 m/s 13 m/s 10 m/s

Question 3: Forces F₁ and F₂ in the figure above act on a block of mass m = 10kg that moves on a frictionless surface. What is the acceleration of the block? 1 m/s 1.5 m/s 2 m/s 2.5 m/s 3 m/s

Question 4: A block of mass m is moving down an inclined plane with a decreasing speed. The coficient of friction between the block and the plane is μ. Which of the following statements is true? sin(α) < μ sin(α) > μ cos(α) < μ cos(α) > μ tan(α) < μ

Question 5: When a car&aposs kinetic energy increases 9 times, what happens with its speed? increases 9 times increases 3 times decreases 9 times decreases 3 times remains constant

Question 6: An object of mass 4kg is attached to a spring. The equilibrium position of the object is .4m from the point where the spring exerts no force on the object. What is the spring constant, k? 10 N/m 80 N/m 100 N/m 150 N/m 200 N/m

Question 7: An object of mass 10kg sitting on a frictionless horizontal plane is moved from a stationary state by the force shown above. What is the velocity of the object at time t = 5s? 2.5 m/s 3 m/s 4 m/s 5 m/s 6 m/s

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