A spring has 0.770 kg oscillating on it with a period of 1.25 seconds. (a) What is the frequency? ...

A spring has 0.770 kg oscillating on it with a period of 1.25 seconds.
 
  (a) What is the frequency?
  (b) Determine the spring constant.
  (c) If the mass is doubled and the spring made 3 times stiffer, what is the new period?

Question 2

An incompressible fluid flows at 0.252 m/s through a 44. mm diameter (circular cross section) pipe. The pipe widens to a square cross sectional area 5.5 cm on a side. Assuming steady flow:
 
  (a) what is the speed through the square section?
  (b) what is the flow rate in liters/minute?

Question 3

How much energy is necessary to place three charges, each of 2.0 C, at the corners of an equilateral triangle of side 2.0 cm?
 
  What will be an ideal response?

Question 4

A basketball is thrown with a velocity of 20. m/s at an angle of 60. above the horizontal. What is the horizontal component of its instantaneous velocity at the exact top of its trajectory? (Neglect air friction.)
 
  A) 10. m/s
  B) zero
  C) 20. m/s
  D) 17.3 m/s
  E) 20. tan(60) m/s