# Search results

1. ### How to carry units in integration

Homework Statement I am trying to integrate from 0 to 10 ft -4x^2/2+4x. I am solving for deflection. The forces are in kips. Somehow the book ends up with k-ft^3. I don't understand how I would carry units in an integration. Any help please? Homework Equations The Attempt at a...
2. ### Engineering Need to interview a Civil Engineer

1. What made you choose this type of engineering? 2. What type of equipment do you work with on a day to day basis? 3. What is your educational back ground? 4. What is your favorite part of the job? 5. What is you least favorite part of the job? 6. Do you need a...
3. ### Dispersion by diffraction grating

Homework Statement White light containing wavelengths from 396 nm to 756 nm falls on a grating with 7300 lines/cm. How wide is the first-order spectrum on a screen 2.15 m away? Homework Equations y=m*L*wavelenth/(d) The Attempt at a Solution using the equation I have found y1 to...
4. ### Induced emf at a specific time

Homework Statement A circular coil with 35 turns of wire and a diameter of 19 cm is placed in a magnetic field given by B(t) = 6 t^2 + 6 t + 2 T where t is time in seconds. The field is perpendicular to the plane of the coil. What is the induced EMF at t = 5 s? Homework Equations...
5. ### Time required to charge a capacitor

Homework Statement A capacitor with a capacitance of C = 28.7 μF is slowly charged by a constant current of I = 63.2 nA. How long does it take to charge the capacitor to a voltage of V = 28.9 V? Homework Equations q=cvb(1-e^(-t/RC)) Vb=IR+QC The Attempt at a Solution I have tried...
6. ### Voltage experience by the bird

Homework Statement A bird stands on an electric transmission line carrying 2210 A, as seen in the figure below. The line has 3.32E-5 Ω resistance per meter and the bird's feet are 3.80 cm apart. What voltage does the bird feel? Homework Equations R=sigma(L)/A I=V/R The Attempt at a...
7. ### Short circuit problem

Homework Statement An underground telephone cable, consisting of a pair of wires, has suffered a short somewhere along its length (at point P in the Figure). The telephone cable is 4.00 km long, and in order to determine where the short is, a technician first measures the resistance between...
8. ### Electric field due to a finite line of charge

Homework Statement A rod of length 25 cm has a uniform linear charge density of 7 μC/m. Determine the Electric Field at a point P located at a perpendicular distance 69 cm along a line of symmetry of the rod. Homework Equations E=k*charge density(integral(dx/(d^2+x^2)^3/2) The...
9. ### Four Charges

Homework Statement Four charges Aq,Bq,Cq, and Dq (q = 1.00 × 10-7C) sit in a plane at the corners of a square whose sides have length d = 85.0 cm, as shown in the diagram below. A charge, Eq, is placed at the origin at the center of the square. DATA: A = 6, B = 2, C = 3, D = 6, E = -1...
10. ### Question about coin toss

1. Homework Statement For this exercise, four coins are tossed 32 times and the number of heads are recorded for each toss. Each toss falls into one of the following macroscopic states; 0 heads, 1 heads, 2 heads, 3 heads and 4 heads. Suppose the 32 tosses result in the following outcome...
11. ### Time an object takes to oscillate

Homework Statement An object in SHM oscillates with a period of 5.73 s and an amplitude of 10.47 cm. How long does the object take to move from x=0 cm to x=5.78 cm? Homework Equations x=Acos(wt+ro) The Attempt at a Solution I solved for ro which was pi/2 when x=o and t=o. Then...
12. ### Time Constant problem

Homework Statement A spring with spring constant 18.39 N/m hangs from the ceiling. A 452 g ball is attached to the spring and allowed to come to rest. It is then pulled down 4.62 cm and released. What is the time constant if the ball’s amplitude has decreased to 2.85 cm after 32 oscillations...
13. ### Amplitude problem

Homework Statement An air-track glider is attached to a spring. The glider is pulled to the right and released from rest at t=0 s. It then oscillates with a period of 1.5 s and a maximum speed of 40.4 cm/s. What is the amplitude of the oscillation? Homework Equations x=Acos(wt+ro)...
14. ### Finding Phase Constant and air-track glider

Homework Statement An air-track glider attached to a spring oscillates with a period of 2.3 s. At t=0 s the glider is 3.09 cm left of the equilibrium position and moving to the right at 35.07 cm/s. What is the phase constant? (in degrees) Homework Equations v0x= -wAsin(ro)...
15. ### Finding Amplitude

Homework Statement An air-track glider attached to a spring oscillates between the 9.23 cm mark and the 50.23 cm mark on the track. The glider completes 27 oscillations in 44.7 s. angular frequency of the glider? (in rad/s) 3.7933 what is the amplitude of the glider? Homework Equations...
16. ### Water in a pipe problem

Homework Statement Water flowing through a 2.68 cm diameter pipe fill a 284 L bathtub in 8.2 minutes. What is the speed of the water in the pipe? Homework Equations p+pgh +1/2pv^2=p2 +pgh + 1/2pv2^2 The Attempt at a Solution I know that p=pat for both cases but the water does not...
17. ### Steel floating in mercury problem

Homework Statement A 17.85 cm diameter, 32.4 cm tall steel cylinder (ρsteel=7900 kg/m3) floats in mercury. The axis of the cylinder is perpendicular to the surface. What length of steel is above the surface? Homework Equations vsub/vobj=(ro)obj/(ro)liquid The Attempt at a SolutionA...
18. ### Tension in the string of a submerged object

Homework Statement An aluminum object suspended from a string with density 2700 kg/m^3 is submerged into ethyl alcohol. what is the tension in the string? V=142 cm^3 Homework Equations vsub/vobj=(ro)object/(ro)ethyl alcohol p=po+rogh The Attempt at a Solution I tried to multiply the...