2. Suppose an object with initial temperature To is placed in a sealed container, which is in turn placed in a medium with temperature Tm: Let the initial temperature of the container be So. Assume that the temperature of the object does not affect the temperature of the container, which in turn does not affect the temperature of the medium. (These assumptions are reasonable, for example, if the object is a cup of coffee, the container is a house, and the medium is the atmosphere.)

The 10-turn loop of wire shown in the figure(Figure 1) lies in a horizontal plane, parallel to a uniform horizontal magnetic field, and carries a 2.0 A current. The loop is free to rotate about a nonmagnetic axle through the center. A 50 g mass hangs from one edge of the loop. Part A What magnetic field strength will prevent the loop from rotating about the axle? Express your answer to two significant figures and include the appropriate units. µA ? B = Value Units Figure < 1 of 1 Submit Request Answer

8. A stone is dropped from the top of a building(v=0). It hits the ground after 2.0 s. The height of the building is: a) 9.8 m b) 9.6 m c) 4.9 m d) 19.6 m

Week 3 #9