Recent content by bcalkins

Wow, after typing that all out I was seeing what I was doing wrong. I've got it figured out now. :)

Homework Statement The continuity equation provides a second relation between the vA and vB, this time in terms of the diameters d and D. Numerical check: If the diameters are d = 1 cm and D = 10 cm, what is the ratio of the speeds, vB/vA? Homework Equations To clarify, is both d and D...

Acceleration and drainage time?

Okay, so should P1 and P2 be taken out of the equation if they equal each other? If so, you'd be left with 1/2pv1^2+pgy1 = 1/2pv2^2+pgy2 So, to get the v2^2-v1^2 = ? as the question asks; how do I get everything else to one side? The farthest I get to is: pgy1-pgy2 = 1/2pv2^2 - 1/2pv1^2 to...

Error: The difference between the result of the measurement and the true value of what you're measuring. True value: What the actual value should be. Approximation: What you approximated or rounded the measurement to. Well, I believe from the above problem that the approximation would be within...

Thank you Chestermiller, I feel really stupid that I can't do simple algebra. I think based on P1=P2 you could just take that out of the equation. To move pgy you would subtract from both sides so you'd be left with: 1/2pva^2 = 1/2pvb^2 How would I get va^2 to the right side of the equation...

1. Homework Statement : The expressions you obtained for acceleration and drainage time (equations 3 and 4 in the manual) both contain the following factor or something equivalent: (D/d)^4-1 In the lab, we will be dealing with a bottle with a diameter around 9 cm. A typical diameter of the...

Bernolli's Equation: vb^2-va^2 = ? 1. Homework Statement : Use Bernoulli’s principle to obtain a relation between the speeds of water at points A and B, vA and vB, in terms of the acceleration of gravity g and the height of the water column h. Your expression should be of the form: vb^2-va^2...

Consider a solid disk made of aluminum with a central hole as shown in the figure - can't include...don't believe it's necessary. The external and internal diameters are found to be 13 inches and 0.6 inches. The disk is 0.5 inch thick. The density of aluminum is 2.70 g/cm3. Question: Calculate...

Hello, I have a physics lab tomorrow and have to answer this question to be admitted in. We haven't begun to talk about Pendulums in lecture yet, so I have NO idea where to start. Here's the question: A mass of 40 kg suspended from a 43-cm long light string forms a simple pendulum. The mass...

Can you please help with the following problems? Formulas would be greatly appreciated or talking me through a problem. Thank you! 1.) A mass of 40 kg suspended from a 48-cm long light string forms a simple pendulum. The mass swings through the lowest point of its trajectory with a speed of 2...

Question: A block of mass m and speed v collides with a spring, compressing it a distance deltaX. What is the compression of the spring if the mass of the block is halved and its speed is doubled? I have no idea how to do this problem. If anyone can explain this to me it would be GREATLY...

A farmhand pushes a 26-kg bale of hay 3.9 meters across the floor of a barn. If she exerts a horizontal force of 88N on the hay, how much work has she done? My Answer: W=88N x 3.9m = 343.2 Joules My question: Is this correct or do I have to do something with the mass of 26-kg? Thank you!

okay, thank you!

Hey, I have a practice problem that I haven't been able to get and a test coming up. I've looked in the book for how to solve the problem but can't find anything. Would you mind helping, please? Problem: A 2 kg block is at rest on a dry, flat, horizontal table. A horizontal force with...