You walk 53 m to the north, then you turn 60° to your right and walk another Determine the direction of your displacement vector. Express your answer as an angle relative to east
A) 63° N of E
B) 50° N of E
C) 57° N of E
D) 69° N of E
A
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A thin rectangular piece of wood floats in water. You slowly pour oil with a density equal to that of the wood on the surface of the water until the height of the oil above the water is twice the height of the piece of wood. Which statement is correct?
a. The wood floats on top of the oil, so it sticks up in the air. b. The wood does not change its position c. The wood sinks below the surface of the water. d. The wood is half in the water and half in the oil. e. The wood floats in the oil just above the water.
How does the best possible angular resolution of a telescope with a 10-meter diameter mirror compare to that of a telescope with a 5-meter diameter mirror?
A) The 10-meter telescope's angular resolution is better by a factor of 2. B) The 10-meter telescope's angular resolution is better by a factor of 4. C) The 10-meter telescope's angular resolution is better by a factor of 10.
Consider a pin fin with variable conductivity k(T), constant cross sectional area Ac and constant perimeter, P. Develop the difference equations for steady one-dimensional conduction in the fin and suggest a method for solving the equations. The fin is exposed to ambient temperature Ta through a heat transfer coefficient h. The fin tip is insulated and the fin root is at temperature To.
GIVEN
• Fin with variable thermal conductivity, k(T)
FIND
(a) Difference equation (b) Solution method
SKETCH
Rotational Kinetic Energy: The L-shaped object shown in the figure consists of three small masses connected by thin uniform rods, each rod of mass 3.00 kg. Assume that the masses shown are accurate to three significant figures. How much work must be done to accelerate the object from rest to an angular speed of 3.25 rad/s about the y-axis?
Fill in the blank(s) with the appropriate word(s).