Recent content by timtng

An electron starts at the position (0,0) with an initial velocity 5,000,000 m/s at 45 degrees angle to the x axis. THe electric field is in the positive y direction and has a magnitude of 35000 N/C. At what location will the electron strikes? Please help me setup this problem. :confused:

A transverse wave of frequency 40 Hz propagates down a string. Two points 5 cm apart are out of phase by p/6. (a) What is the wavelength of the wave? (b) At a given point, what is the phase difference between two displacements for times 5 ms apart? (c) What is the wave velocity? for a.)...

When the tension is 18 N, a string 2.00 m long has a fundamental frequency of 150 Hz. a.) What is the mass of the string? b.) With what tension must the string be stretched so that it vibrates in three segments at 150 Hz? This is what I came up with: a.) f=v/2L, v=2Lf=2*2*150=600 m/s...

A common method for estimating the distance to a lightning flash is to begin counting when the flash is observed and continue until the thunder clap is heard. The number of seconds counted is then divided by 3 to get the distance in kilometers. What is the velocity of sound in kilometers...

A load of mass .2 kg is hanging from a light spring whose elastic constant is 20 N/m. The load is pulled down .1 m from its equilibrium position and released. How long is required for the load to reach its equilibrium position? This is what I did: T=2π(sqrt(m/k))=.628 s my friend...

When the tension is 18 N, a string 2.00 m long has a fundamental frequency of 150 Hz. a.) What is the mass of the string? b.) With what tension must the string be stretched so that it vibrates in three segments at 150 Hz? This is what I came up with: a.) f=v/2L, v=2Lf=2*2*150=600 m/s...

An automobile has 58% of its weight on the front wheels. The front and back wheels are separated by 2 m. Where is the center of gravity located with respect to the front wheels? Need help setting up the problem. Thanks

Misako wishes to measure the strength of her biceps muscle by exerting a force on a test strap. The strap is 28 cm from the pivot point at the elbow, and her biceps muscle is attached at a point 5 cm from the pivot point. If the scale reads 18 N when she exerts her maximum force, what force is...

Two spheres of radius R rest on a horizontal table with their centers a distance 4R apart. One sphere has twice the weight of the other sphere. Where is the center of gravity of this system? Please help me solve this problem.

Thank y'all very much for taking time to help me. I appreciate it.

what I don't understand is why 1/.925?

An ice skater doing a toe spin with outstretched arms has an angular velocity of 4 rad/s. She then tucks in her arms, decreasing her moment of inertia by 7.5% a. What is the resulting angular velocity? b. By what factor does the skater's kinetic energy change? For a, I use IW = I'W' >>...

I figured since they ask how far apart are the nodes, L has to be a contributing factor.

shouldn't the answer be: L-λ/2

So the answer should be λ/2?