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Unformatted text preview: 6.‘ 10. 11. 12. 13. A construction worker uses a steel tape to measure the length of an aluminum support column. If the measured length is 23.400 m when the temperature is 13.7°C, what is the measured length when the temperature rises to 261°C? (am = 24 x 10‘6 °C’1, as”) = 11 x 10‘6 °C'}) ‘ (1) 23404 In (2) 23.392 m (3) 23.407 m (4) 23.401 m (5) 23.417 m f E x . A 11.0 m, 200 N uniform ladder rests against a frictionless wall. The coeficient of static friction between the ladder and the ground is 0.430, and the ladder makes a 60.0° angle with the ground. How far up the ladder can a 700 N person climb before the ladder begins to slip? (1) 8.96 m (2) 7.32 m (3) 4.07 m (4) 9.66 m (5) 6.20 m . Of the nine known planets in our solar system, the innermost is Mercury. When compared to the other planets in the solar system, Mercury has the: (l) greatest centripetal acceleration. (2) greatest period of revolution. (3) smallest angular velocity. (4) smallest tangential velocity. (5) none of these . A fan blade, initially at rest, rotates with a constant acceleration of 0.025 rad/s”. What is its angular speed at the instant it goes through an angular displacement of 4.2 rad? (1) 046 rad/s (2) 0.025 rad/s (3) 0.11 rad/s (4) 122 rad/s (5) 0.32 rad/s The force of Earth’s gravity on an object at a distance of three Earth radii from the center of the Earth is 1.00 N. ' What is the object’s mass? l (1) 0.92 kg (2) 0.102 kg (3) 0.306 kg (4) 1.0 kg (5) 9.8 kg An object of mass m and moment of inertia I has rotational kinetic energy K 3. Its angular momentum is (1) (2mm (2) 0.5I/m (3) (2mKR)i _ (4) not given (5) (fir A solid sphere rolls down an incline of height 3 in after starting from rest. In order to calculate its speed at the bottom of the incline, one needs to know (1) no more than is given in the problem. (2) the mass of the sphere. (3) the radius of the sphere. (4) the mass and the radius of the sphere. (5) the angle between the incline and the horizontal. A rotating flywheel can be used as a method to store energy. If it is required that such a device be able to store up to a maximum of 1.00 x‘ 106.] when rotating at 400 rad/s, what moment of inertia must the flywheel have? (1) 12.5 kg-m2 (2) 50 kg-m2 (3) 25 kg-In2 (4) 6.3 kg-m2 (5) 20 kg-m2 144 ...
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