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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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
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
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).