Simple Pendulum: As shown in the figure, a 0.23-kg ball is suspended from a string 6.87 m long and is pulled slightly to the left. As the ball swings through the lowest part of its motion it encounters a spring attached to the wall. The spring pushes against the ball and eventually the ball is returned to its original starting position. Find the time for one complete cycle of this motion if the spring constant (force constant) is 19 N/m. (Assume that once the pendulum ball hits the spring there is no effect due to the vertical movement of the ball.)
Fill in the blank(s) with the appropriate word(s).
3.0 s
Physics & Space Science
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The various layers of the atmosphere are distinguished by the behavior of the ________
Fill in the blank(s) with correct word
Physics & Space Science
A 0.75-kg sphere is released from rest and is moving 5.0 m/s after falling 2.0 m in a viscous medium. What is the change in mechanical energy caused by the force the viscous medium exerts on the sphere during this descent?
a. ?6.1 J b. ?4.6 J c. ?5.3 J d. ?6.8 J e. ?2.7 J
Physics & Space Science
One hundred meters of a certain type of wire has a resistance of 7.2 
What is the resistance of 2.5 m of this wire?
A. 18
B. 1.8
C. 0.18
D. 3.0
E. 0.30
Physics & Space Science
Explain how the central engine powers an active nucleus or quasar
What will be an ideal response?
Physics & Space Science