A 2.0-kg mass swings at the end of a light string (length = 3.0 m). Its speed at the lowest point on its circular path is 6.0 m/s. What is its kinetic energy at an instant when the string makes an angle of 50° with the vertical?
a. 21 J
b. 15 J
c. 28 J
d. 36 J
e. 23 J
b
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As an object moves faster through the air, its terminal speed increases
Indicate whether the statement is true or false
An icy leftover planetesimal orbiting the Sun is called a(n)
A) comet. B) moon. C) asteroid. D) meteorite.
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
The primary winding of an electric train transformer has 400 turns and the secondary has 50. If the input voltage is 120 V (rms) what is the output voltage?
A. 15 V (rms) B. 30 V (rms) C. 60 V (rms) D. 2.4 V (rms) E. 960 V (rms)