Midterm 2 Practice 1

# Midterm 2 Practice 1 - Name Student ID Score Last First I...

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Name________________________________ Student ID________________ Score__________ Last First I) Multiple choice (11 questions, 5 points each) A mass m is placed on a rough incline. A force F is applied to the mass in a direction up the incline. The magnitude of the force is just enough to prevent the mass from sliding down. Which arrow best represents the direction of the friction? F a b c d e m A) (a) D) (d) B) (b) E) (e) C) (c) A woman drives her car at a speed of 25 m/s around a un-banked corner. The coefficients of friction between the road and the tires are 0.70 (static) and 0.40 (kinetic). What is the minimum radius of curvature for the corner in order for the car not to skid? A) 3.5 10 2 m B) 64 m C) 2.1 10 2 m D) 1.6 10 2 m E) 91 m The Earth has mass 5.97 10 24 kg. The moon has mass 7.35 10 22 kg. The distance between the centers of the Earth and the Moon is 3.84 10 5 km. How far from the center of Earth is the center of mass of the Earth–moon system? A) 4.67 10 3 km D) 2.11 10 5 km B) 7.42 10 3 km E) 3.84 10 3 km C) 1.92 10 5 km Use the scenario below for the next two questions.

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