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    Probability and Statistics, very basic stuff

    Homework Statement Suppose that a dietitian has 3 groups of foods, having 5 items in the first group, 7 items in the second group and 2 items in the third group. 1. How many meals are possible containing one food from each food group? 2. How many meals are possible containing 3 foods from...
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    Spring and Oscillation

    how do I set it up though .5kx^2= .5mv^2?
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    Spring and Oscillation

    I checked the thread and it wasnt much of a help I tried to use conservation of momentum for this but it doesnt work
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    Spring and Oscillation

    A 5.00 g bullet moving with an initial speed of v0 = 405 m/s is fired into and passes through a 1.00 kg block, as in Figure P13.58. The block, initially at rest on a frictionless horizontal surface, is connected to a spring with a spring constant of 950 N/m. Figure P13.58 (a) If the block...
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    Among Simple harmonic oscillation, simple pendulum and physical pendulum

    can someone answer this please does the period have any m dependence in the simple pendulum? No right since its a masless rod. Also under what condition does the theoretical formula hold for the simple pendulum, would it be only for larger angles and amplitudes? Also there is a mass dependence...
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    Among Simple harmonic oscillation, simple pendulum and physical pendulum

    thanks alot, also does the period have any m dependence in the simple pendulum? No right since its a masless rod. Also under what condition does the theoretical formula hold for the simple pendulum, would it be only for larger angles and amplitudes? Also there is a mass dependence in the...
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    Among Simple harmonic oscillation, simple pendulum and physical pendulum

    What is the similarity between Simple Harmonic Oscillation(SHO), simple pendulum and a physical pendulum? I never understood it. Like whats the physical significance of SHO, or the energy and momentum change in oscillating motion?
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    Gases and Pressure

    hmm I really dont know what I am doing wrong, this is so frustrating
  9. P

    Gases and Pressure

    ^ I have it written on top but if u want it again ((1.013X10^5 Pascals)(.004m^3))/20 Celsius= (((1.013X10^5 Pascals + 2X10^3N/m X height)/0.0100 meters^2)(.004m^3 + 0.0100meters^2 X height))/all over 230 Celsius
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    Gases and Pressure

    ^ I have it there in Celsius
  11. P

    Gases and Pressure

    can someone help me and try it and see what I am doing wrong and the answer they get?
  12. P

    Thermal Concrete Physics

    L= 270 change in L/270= 12 X 10^-6 (21)= 0.06804 270+0.06804= 270.06804 270/2= 135 270.06804/2= 135.03402 now according to u I should do pythagorean theorum, which I did and got 190.9 thats not right I got it though finally, when I do L/2, which is 270/2= 135, take the change in L, which is...
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    Thermal Concrete Physics

    ^ the height should be around 3.0, I am not getting that number
  14. P

    Thermal Concrete Physics

    anyone care to help?
  15. P

    Gases and Pressure

    I dont know whats wrong, its not getting the right answer
  16. P

    Thermal Concrete Physics

    This is so frustrating
  17. P

    Thermal Concrete Physics

    how? I got change in L as 0.06804
  18. P

    Gases and Pressure

    I am doing something wrong, I am not getting it right
  19. P

    Gases and Pressure

    1 Pa ≡ 1 N/m² let me convert the ml to m^3, maybe thats the problem
  20. P

    Gases and Pressure

    the 1 atm of pressure= 1.013X10^5 Pascals I edited it to include the units
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    Gases and Pressure

    ((1.013X10^5 Pascals)(.004m^3))/20 Celsius= (((1.013X10^5 Pascals + 2X10^3N/m X height)/0.0100 meters^2)(.004m^3 + 0.0100meters^2 X height))/all over 230 Celsius
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    Thermal Concrete Physics

    Homework Statement Two concrete spans of a L = 270 m long bridge are placed end to end so that no room is allowed for expansion (Fig. P10.55a). If the temperature increases by T = 21.0°C, what is the height y to which the spans rise when they buckle (Fig. P10.55b) Homework...
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    Gases and Pressure

    Homework Statement An expandable cylinder has its top connected to a spring with force constant 2.00 103 N/m. (See Fig. P10.58.) The cylinder is filled with 4.00 L of gas with the spring relaxed at a pressure of 1.00 atm and a temperature of 20.0°C. (a) If the lid has a...
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    Fluid Flow

    thank u so much guys, I understand the method better now
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    Fluid Flow

    so the vertical component, which is Lsin30, is that the initial height? I am confused, I tried this again and again but I cant egt it right. And the gauge pressure is 0 since the air is touching the water, air's pressure is 1 atm
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    Fluid Flow

    Homework Statement Figure P9.81 shows a water tank with a valve at the bottom. If this valve is opened, what is the maximum height attained by the water stream coming out of the right side of the tank? Assume that h = 8.0 m, L = 1.50 m, and = 30° and that the cross-sectional area at A is very...
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    Rotational Kinetic Energy and Work

    The puck in Figure P8.51 has a mass of 0.120 kg. Its original distance from the center of rotation is 40.0 cm, and it moves with a speed of 85.0 cm/s. The string is pulled downward 15.0 cm through the hole in the frictionless table. Determine the work done on the puck. (Hint: Consider the change...
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    Astronaut and weightlessness

    Why does an astronaut in a space craft orbiting the Earth experience a feeling of weightlessness?
  29. P

    Torque and Force example

    (a) Give an example in which the net force acting on an object is zero and yet the net torque is nonzero. (b) Give an example in which the net torque acting on an object is zero and yet the net force is nonzero. can b be torque= Tension(12 N)(radius 0m) ?
  30. P

    Figure Skating and Angular Momentum

    can u explain in detail how it would work, thanks
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