Springs: A very light ideal spring with a spring constant (force constant) of 2.5 N/cm pulls horizontally on an 18-kg box that is resting on a horizontal floor. The coefficient of static friction between the box and the floor is 0.65, and the coefficient of kinetic friction is 0.45.(a) How long is the spring just as the box is ready to move?(b) If the spring pulls the box along with a constant forward velocity of 1.75 m/s, how long is the spring?(c) How long is the spring if it pulls the box forward at a constant 2.75 m/s?
What will be an ideal response?
(a) 46 cm (b) 32 cm (c) 32 cm
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The oldest-known smelted iron dates to approximately what year?
(a) 27,000 BCE (b) 6000 BCE (c) 2500 BCE (d) 1000 BCE
Our Solar System:
is centrally positioned in the Milky Way galaxy. formed 10 billion years ago. has a massive, first-generation star at its center. completes one rotation around the center of the Milky Way every 250 million years. All of the above are true.
A 200-? resistor, 40.0-mH inductor and a 2.00-?F capacitor are connected in series with a 120-V rms source at 1000 Hz. What is the phase angle of this circuit?
A) 49.3° B) 90.0° C) 40.7° D) 0° E) 45.0°
A car travels in an oval path as shown below. 
= 25 m/s, West, and 
= 20 m/s, North. The ratio of the magnitude of the centripetal acceleration at B to that at A,
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?
?
A. 0.512
B. 0.64
C. 0.8
D. 1.25
E. 1.56