Sunday
April 20, 2014

Homework Help: physics

Posted by Sandhya on Saturday, May 24, 2008 at 7:46am.

1. A 70 kg uniform 4.0 m long beam is attached to a vertical wall and is supported by a wire. The beam makes an angle of 45 degrees with the horizontal and the wire is horizontal. The
horizontal component of the force that the wall exerts on the lower end of the beam is, in Newtons ( g = 9.8 N/kg
A) 195
B) 245
C) 232
D) 343
E) None of the above. My answer is__________________________


2. A Styrofoam box used as a picnic cooler has a surface area of 0.60 m2 and a wall thickness of
2.0 cm. The temperature inside is 5 oC, and that outside is 25 oC. It takes 10.0 hours for 5.0 kg of ice to melt in the
cooler. If the temperature outside the cooler where 20 oC, then the number of hours the 5.0 kg of ice would last is, in
hours
A) 11.7
B) 12.5
C) 13.3
D) 15.0
E) None of the above. My answer is__________________________

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