A flat horizontal plate of area 400 cm2 is dragged over a 0.20 cm thick layer of oil at a speed of 30.0 cm/s. The oil is resting on a fixed horizontal surface. It takes a force 1.20 N applied to the plate to sustain this speed
What is the viscosity of the oil? A) 6.00 kg/m • s
B) 20.0 kg/m • s
C) 60.0 kg/m • s
D) 0.200 kg/m • s
E) 200 kg/m • s
D
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A cube is subjected to a pressure of 12 atmospheres. The un-squeezed length of one side of the cube is 10.000 cm. The squeezed length of one side of the cube is 9.999 cm. The bulk strain on the cube is
a. 
b. 
c. 
d. 
e. 
An oscillating system has a small amount of damping. It is observed that in the course of 20.0 s the amplitude has decreased from A to A/2. What additional time is required for the amplitude to decrease to A/10?
What will be an ideal response?
Equipotentials are lines along which
a. the electric field is constant in magnitude and direction. b. the electric charge is constant in magnitude and direction. c. maximum work against electrical forces is required to move a charge at constant speed. d. a charge may be moved at constant speed without work against electrical forces. e. charges move by themselves.
Addition by 1. Components: The figure shows four vectors, 
, 
, 
, and 
. Vectors 
and 
both have a magnitude of 7.0 cm, and
vectors 
and 
both have a magnitude of 4.0 cm. Find the magnitude and direction of the sum of these four vectors. 
What will be an ideal response?