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15. The same constant force is used to accelerate two carts ef the same mass, initially at rest, on horizontal frietionless tracks. The force is applied to cart A for twice as fong a time as it is applied to cart B. The work the force does on A is WAi that on B is W, Which statement is correct? a WA-W b. W-J2w e. WA-2 W, d. WA-4 W e. W.-2 WA

15. The same constant force is used to accelerate two carts ef the same mass, initially at rest, on horizontal frietionless tracks. The force is applied to cart A for twice as fong a time as it is applied to cart B. The work the force does on A is WAi that on B is W, Which statement is correct? a WA-W b. W-J2w e. WA-2 W, d. WA-4 W e. W.-2 WA

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15. The same constant force is used to accelerate two carts of the same mass, initially at rest, on horizontal frietionless tracks. The force is applied to cartA for twice as long a time as it is applied to cart B. The work the force does on A is Wai that on B is Wa. Which statement is correct? WA- Wn- b. WA-2 w. c. W-2 W d. WA-4 W- e. Wa-2 WA a. 16. Each of two vectors, D and D,, lies along a coordinate axis in the xy plane. Each vector has its tail at the origin, and the dot product of the two vectors is D, D, - 0. Which possibility is correct? a. D, and b. 5, lies along the positive x axis. D, lies along the negative x axis. c. D, D, both lie along the positive x axis. and D, both lie along the positive y axis. d. D, lies along the negative x axis. D, lies along the negative y axis. e. D, lies along the positive y axis. D, lies along the negative y axis. 17. A 2.0-kg block sliding on a horizontal frictionless surface is attached to one end of a horizontal spring (k 200 N/m) which has its other end fixed. If the block has a speed of 4.0 m/s as it passes through the equilibrium position, what is its speed when it is 20 cm from the equilibrium position? a 2.6 m/s b. 3.1 m/s c. 3.5 m/s d. 1.9 m/s e. 2.3 m/s 18. Objects A and B, of mass M and 2M respectively, are each pushed a distance d straight up an inclim by a force F parallel to the plane. The coefficient of kinetic friction between each mass and the pla the same value . At the highest point, a. K= Fd = Kg. b. K = (F-HMg cose)d, Ky = (F-2u Mg cose)d. c. K = (F- Mg sin@)d; Kg (F-2Mg sin0)d. d. K= (F-Mg sin@- HMg cose)d; K3 = (F- Mg sin@- Mg cose)d. e. K= (F- Mg sine- Mg cos0)d; K, (F-2Mg sine-2Mg cose)d. %3D Page 6 of 7
Transcribed Image Text:15. The same constant force is used to accelerate two carts of the same mass, initially at rest, on horizontal frietionless tracks. The force is applied to cartA for twice as long a time as it is applied to cart B. The work the force does on A is Wai that on B is Wa. Which statement is correct? WA- Wn- b. WA-2 w. c. W-2 W d. WA-4 W- e. Wa-2 WA a. 16. Each of two vectors, D and D,, lies along a coordinate axis in the xy plane. Each vector has its tail at the origin, and the dot product of the two vectors is D, D, - 0. Which possibility is correct? a. D, and b. 5, lies along the positive x axis. D, lies along the negative x axis. c. D, D, both lie along the positive x axis. and D, both lie along the positive y axis. d. D, lies along the negative x axis. D, lies along the negative y axis. e. D, lies along the positive y axis. D, lies along the negative y axis. 17. A 2.0-kg block sliding on a horizontal frictionless surface is attached to one end of a horizontal spring (k 200 N/m) which has its other end fixed. If the block has a speed of 4.0 m/s as it passes through the equilibrium position, what is its speed when it is 20 cm from the equilibrium position? a 2.6 m/s b. 3.1 m/s c. 3.5 m/s d. 1.9 m/s e. 2.3 m/s 18. Objects A and B, of mass M and 2M respectively, are each pushed a distance d straight up an inclim by a force F parallel to the plane. The coefficient of kinetic friction between each mass and the pla the same value . At the highest point, a. K= Fd = Kg. b. K = (F-HMg cose)d, Ky = (F-2u Mg cose)d. c. K = (F- Mg sin@)d; Kg (F-2Mg sin0)d. d. K= (F-Mg sin@- HMg cose)d; K3 = (F- Mg sin@- Mg cose)d. e. K= (F- Mg sine- Mg cos0)d; K, (F-2Mg sine-2Mg cose)d. %3D Page 6 of 7
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