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Home >All Categories > Science & Mathematics >Physics >Open Question mmmpizza... Member since:April 05, 2007Total points:98 (Level 1)a .50 kg mass attached to a spring undergoes simple harmonic motion with a period of .75 s what is the force constant of spring??
the answer says its 140 N/m but i cannot get that answer i am using
t=2(pi)vm/k
.75=6.28v(.15/k)
.0143=.5/k
34.9????Answer Question

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A mass of 1.89 kg on a spring rests on a frictionless surface and has a horizontal force of magnitude 1.7 N applied to it to keep it 1.57 m from the equilibrium. The mass undergoes simple harmonic motion when released.

Spring constant = 1.08 N/m
Frequency = 0.120 Hz
Maximum speed = 1.19 m/s

What is the maximum magnitude of the acceleration?

What is the magnitude of the acceleration of the mass when it's displacement is one fifth of the maximum value?

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for the harmonic motion of the trigonometric function, find a) maximum displacement, b.) the frequency and c.) the least positive value of t for which d=0

1.) d = 1/2 cos20pi t

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(a) What is the frequency of the oscillation?

(b) If the amplitude of the oscillation is 4.0cm, what is the maximum value of the velocity?

(c)How long does it take the mass to move from 1.5cm to 2.5cm?

(d)If the mass is oscillating with a maximum speed of 45m/s, what is the amplitude?

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You are in a car going 70 km/h and another car passes you going in the opposite direction at 70 km/h. Do both cars have the same velocity? Explain. (3 points)

17. What is the difference between distance and displacement?
(3 points)

18. You push on a crate with a force of 10 N to the right, and your friend pushes on the crate with a force of 25 N to the left. Describe and explain the motion of the crate. (3 points)

19. Two objects that have the same weight are dropped from a tall building. One object is larger and flatter than the other. Explain why the larger object hits the ground last. (3 points)

20. Explain how your teeth work as a wedge.
(3 points)

21. An inventor claims to have built a machine that can produce 120 J of work with an input of 110 J. Would you believe the inventor's claim? Why or why not? (3 points)

22. A comfortable summer day is 77°F. What is this on the Celsius scale? (5 points)

23. Explain how heat is transferred between a hot and a cold object by conduction.

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The distance in feet that a football travels when launched from the ground with an initial velocity of V0 ft/sec is given by: x = (v0 sinT cosT)/16, where T is the angle btw the trajectory and the ground.
a) Use an identity to write the distance x as a fxn of 2T. (the hint given was: use double angle identity sin(2x) = 2sin(x)cos(x).
b) How would I graph the fxn from part a) using an initial velocity of 50 ft/sec?
c) From your graph, determine the value of theta that maximizes x. Does this value of T max x for any velocity? Explain.
d) When Morten Anderson kicks a football 55 yd using the angle determined in part c), what is the initial velocity of the football in mph? (hint given was: justify answer 49.5 mph).
e) do you think the actual initial velocity for a 55-yd field goal is larger or smaller than that found in part d?

If you can answer all or even just parts of my question, that would be fabulous! Some help is better than none at all! So thank you in advance. Hopefully this will help me to better understand Trig. = )

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