28. In the produce section of a supermarket, five pears are placed on a spring scale. The stretches the spring and causes the dial to mave from zero to a reading of 2.0 kg. If the spring what is the displacement of the spring due to the weight of the pears? placement of the pears constant is 450 N/m, A) 0.0044 m B) 0.0088 m C) 0.018 m D) 0.044 m E) 0.088 m 29. Melissa\'s favorite exercise equipment at the gym consists of various springs. In one exercise, she pulls a handle grip attached to the free end of a spring to 0.80 m from its unstrained position. The other end of the spring (spring constant - 45 N/m) is held in alace by the equipment frame. What is the magnitude of the force that Melissa is applying to the handle grip? A) 29 N B) 36N C) 42 N D) S4N E) 66N 30. Which one of the following statements is true concerning an object executing simple harmonic motion? A) The object\'s velocity is never zero. B) The object\'s acceleration is never zero. C) The object\'s velocity and acceleration are simultaneously zero. D) The object\'s velocity is zero when its acceleration is a maximum. E) The object\'s maximum acceleration is equal to its maximum velocity
Solution
28) we know the spring force is given by
F = ky
Mg = ky
2 x 9.81 = 450y
y = 0.044 m
29.
Again using the same formula
F = ky
F = 45 x 0.8
F = 36 N
30.
At far point during SHM motion, when a object reach at it extreme position. At that point, the velocity of the object is zero (because that point it return back) while acceleration is maximum. Hence (d) is correct.
.
28- In the produce section of a supermarket- five pears are placed on.docx
1. 28. In the produce section of a supermarket, five pears are placed on a spring scale. The stretches
the spring and causes the dial to mave from zero to a reading of 2.0 kg. If the spring what is the
displacement of the spring due to the weight of the pears? placement of the pears constant is 450
N/m, A) 0.0044 m B) 0.0088 m C) 0.018 m D) 0.044 m E) 0.088 m 29. Melissa's favorite
exercise equipment at the gym consists of various springs. In one exercise, she pulls a handle
grip attached to the free end of a spring to 0.80 m from its unstrained position. The other end of
the spring (spring constant - 45 N/m) is held in alace by the equipment frame. What is the
magnitude of the force that Melissa is applying to the handle grip? A) 29 N B) 36N C) 42 N D)
S4N E) 66N 30. Which one of the following statements is true concerning an object executing
simple harmonic motion? A) The object's velocity is never zero. B) The object's acceleration is
never zero. C) The object's velocity and acceleration are simultaneously zero. D) The object's
velocity is zero when its acceleration is a maximum. E) The object's maximum acceleration is
equal to its maximum velocity
Solution
28) we know the spring force is given by
F = ky
Mg = ky
2 x 9.81 = 450y
y = 0.044 m
29.
Again using the same formula
F = ky
F = 45 x 0.8
F = 36 N
2. 30.
At far point during SHM motion, when a object reach at it extreme position. At that point, the
velocity of the object is zero (because that point it return back) while acceleration is maximum.
Hence (d) is correct.
