Polyethylene is mechanically soft because different long-chain molecules in polyethylene are held together with weak ______________ bonds.
Fill in the blank(s) with the appropriate word(s).
van der Waals
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Terminal Voltage and Internal Resistance: A heating element having a resistance (at its operating temperature) of 148 ? is connected to a battery having an emf of 523 V and unknown internal resistance.It is found that heat energy is being generated in the resistance of the heating element at a rate of 66.0 W. What is the rate at which heat energy is being generated in the internal resistance of the battery?
Fill in the blank(s) with the appropriate word(s).
How many square centimeters are there in 1 square foot (1 in = 2.540 cm)?
A. 
B. 
C. 
D. 
A 5.00-kg box slides 3.00 m across the floor before coming to rest. What is the coefficient of kinetic friction between the floor and the box if the box had an initial speed of 3.00 m/s?
A) 1.50 B) 0.587 C) 0.153 D) 0.306 E) 0.200
The position of a mass that is oscillating on a spring is given by x = (12.3 cm) cos[(1.26s-1)t]. What is the acceleration of the mass when t = 0.825 s?
A) 9.89 cm/s2 B) -9.89 cm/s2 C) 10.6 cm/s2 D) -10.6 cm/s2 E) 0 cm/s2