- 3. A atudent with a mass of 691 kg runs 2.09 m up the Campion stairs in 2.44 8. His teacher with a mass of 100 kg runs up the same stairs in 3.00 8. Which person-bac greater power? (4)
- 40. A nuclear power plant transmits 6.0 kA through a transmission line with a resistance of 0.50Omega . If there is a 0.70% loss of power due to transmission how much power does the nuclear plant generate? (13.6) I'm
- 6. A boat steers across a river at 15m/s, the current flows at 5.0m/s What is the resultant velocity? 7. How long does it take to cross the river If the river in #6 is 40.0 m-wide? 8. How far downstream n does the boat end up in #7? gift Theta =13.4^circ 9. A boat wants to get directly across a stream:the engine is capable of attaining a speed of 13.0 m/s. If the current is 5.0m/s at what angle should the boat travel a nd what would its speed be as Ask viewed from shore? 10. An airplane flies at 200m/s at 45^circ E of N, a wind blows at 75m/s at 30^circ W of N. What is the resultant velocity of the aircraft as seen from the ground? 11. Two boys pull on ropes tied to a rock by the following forces 150 Nat 30^circ E of S, 160 N at 20^circ W of S. Sketch vectors to represent this and calculate the net force acting on the stump. 12. If the stump in the above question does not move what is the minimum force of friction (magnitude and direction)in this situation?
- An elevator has a mass of 341 kg It moves up 18 m in 22.3 s and uses 7.92times 10^4 Jof electricity. Calculate the power output of this energy transformation. (4)
- 2. A2.0 kg wood box is sitting on a level steel surface. A student pushes the box and it accelerates from rest to 12.4m/s in 3.60 s. What is the net force that acting on the box? (4)
