Recent content by ttk3

Homework Statement A continuous stream of water is flowing out of a faucet and falling into a sink below. Explain why this stream of water is narrower at the bottom (near the sink) than at the top (near the faucet). Hint: Think about the change in velocity and the change in pressure as the...

Homework Statement Calculate the energy and radius for each of the five lowest (n = 1,2,3,4,5) electron orbits in a Helium atom with only one electron. Enter the energy as a positive value in units of "eV" and the radius in units of "nm". Hint: The Helium nucleus has 2 protons so Z = 2 and...

Homework Statement A double slit is composed of two single slits. Each slit has a width of w = 0.01 mm and they are spaced s = 0.04 mm apart. Because the double slit is actually two single slits, the single slit diffraction pattern is superimposed over the double slit pattern and so some...

The question is a direct copy and paste from the program. So if the center of mass is the center of the arm, would I the length of the arm divided by two for my L value?

It says that L is the distance from the center of mass. Wouldn't the center of mass be located at the top of the arm (the point from which the pendulum swings)? The equation is derived from the attached equation, and L would be the arm length in that one I thought.

Homework Statement The moment of inertia for an arm or leg can be expressed as I = AmL^2, where A is a unitless number that depends on the axis of rotation and the geometry of the limb and L is the distance from the center of mass. Say that a person has arms that are 31.30 cm in length and...

thanks, it was just he program being really picky with digits.

hm... it's still not working. I added .145(2.1)(88) + .145*4186*100 = 60723.769 J The total I found was 4.37E5 J.

I think I have the dTpiece wrong this is what I'm entering: 41.86(14.3)(17.1-15.1) / [2.9*(190-15.1)] - [8*(17.1-15.1)] I'm not sure where to go from here...

Homework Statement How many J of energy must be removed when 145.0 g of steam, at a temperature of 188.0°C, is cooled and frozen into 145.0 g of ice at 0°C? Take the specific heat of steam to be 2.1 kJ/(kg·K). Homework Equations Q=m*L The Attempt at a Solution Energy =...

Ah... thank you

Homework Statement I think I'm doing this problem correctly... I'm not sure about my change in temperature value. Any suggestions? Icebergs in the North Atlantic present hazards to shipping, causing the length of shipping routes to increase by about 30 percent during the iceberg...

Ok... So doubling the amplitude doesn't effect the frequency, but I still can't get this question right... I'm so confused

Homework Statement Consider a simple harmonic oscillator made of a mass sliding on a frictionless surface, and attached to a massless linear spring. Which of the following statements are true/false? True False Quadrupling the mass will halve the frequency. True False Doubling the spring...

Homework Statement On a frictionless table, a glob of clay of mass 0.74 kg strikes a bar of mass 1.90 kg perpendicularly at a point 0.48 m from the center of the bar and sticks to it. If the bar is 1.50 m long and the clay is moving at 6.8 m/s before striking the bar, at what angular speed...