Question

1. A constant external force at a downward angle of 30 degrees from hortzontal is applied to a o-kg box, which is on a rough horizontal surface. While the force pushes the box a distance of 8.00m, the speeds up from 0.500 m/s to 2.60 m/s. The work done by friction, in 3, during this process is-1040 3. What is the force, in N ? 3 2. An ideal spring is hung vertically from the celling. When a -kg mass hangs at rest from t, the spring is extended 6.0 cm from its relaxed length. A downward external force is now applied to the mass to extend the spring an additional 10 cm. While the spring is being extended by the force, the appraxdimate work, in J, done by the spring is: B) 12 3. The minimum average power output necessary for a woman to run up a m long hillside is 1.24 horse power, where (1 hp 746 W). The hill is inclined at 25.0° above the horizontal. The run up takes 3.00 s, You can neglect her kinetic energy. What is her approximate mass?

Answer 1

12 3 0

2 larce 3-55 1032- 55 し 154.81-Newton-

2 th hi 25° AM 3
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