# Allison

### Traction Vector?

Consider a 100kg cyclist. He rides a road bike with road tires (which can be assumed to have negligible tread).

The cyclist is riding at 25km/hr and goes around a corner on a blacktop road without slipping. The corner can be assumed to have a radius of 10 m.

Set up an appropriate traction boundary condition (i.e., a traction vector) that approximately the rear tire’s interaction with the road.

Describe any necessary assumptions you have made

Engineering2 months ago### Quantum Physics Distributions?

Plot nFD(E)/V for electrons whose Fermi energy is 4.8 eV from E=4.5 eV to 5.1 eV at T=300 K. Determine from the graph the number of electrons per unit volume just below the Fermi energy that can move to states just above the Fermi energy.

1 AnswerPhysics9 months ago### Physics-Waves?

An electron is confined to a box absorbs a photon with wavelength . As a result, the electron makes a transition from the n=1 state to the n=3 state. (a) Find the length of the box. (b) What is the wavelength ’ of the photon emitted when the electron makes a transition from the n=3 state to the n=2 state.

Physics10 months ago### Waves-Physics?

A certain tuning fork vibrates at 800 Hz. If the tuning fork is tapped, causing it to vibrate, then stopped a quarter of a second later, what is the approximate range of frequencies contained in the sound pulse that reached your ears?

1 AnswerPhysics10 months ago### Physics help?

A hydrogen atom in the second excited (n=2) state will on average undergo a transition to the ground state in about 10-8 seconds. How many revolutions does the electron make in that time?

1 AnswerPhysics10 months ago### Phase Difference ?

The figure shows two point sources of light, A and B. B emits light waves that are +p radians out of phase with the waves from A. A is 3λ from P. B is 5λ from P. (λ is the wavelength.) What is the phase difference between waves arriving at P from A and B?

1 AnswerPhysics10 months ago### Estimate the lift coefficient C_L on the upper surface by approximately integrating the area in the C_P -plot.?

Using values from the NACA 0012 Basic thickness form

Engineering1 year ago### The large gear (shown below) has a mass of 10 kg and a radius of gyration...?

The large gear (shown below) has a mass of 10 kg and a radius of gyration if 200 mm, while the small gear has a mass of 3 kg and radius of gyration of 80 mm. The system is at rest when a couple M of a magnitude of 6 N-m is applied rotating the small gear counter-clockwise. Neglecting friction, determine (a) the number of revolutions executed by the small gear before its angular velocity reaches 600 rpm and (b) the tangential force which the small gear exerts on the large gear. Note: The large gear has a radius of 250 mm and the small gear has a radius of 100 mm.

1 AnswerPhysics1 year ago### An 8 solar mass black hole will have a Schwartzchild radius of about?

a. 2 km

B. 4 km

C. 12 km

D. 24 km

4 AnswersAstronomy & Space1 year ago### The astronomer credited with measuring our place in the galaxy is?

A. Sir James Jeans

B. Harlow Shapely

C. Karl Jansky

D. Edwin Hubble

4 AnswersAstronomy & Space1 year ago### What type of stars do we find in a typical spiral galaxy?

A. Population I

B. Population II

C. Both population I and II

1 AnswerHomework Help1 year ago### Which of these objects would likely be population I?

A. High mass blue super-giant

B. White Dwarf

C. Red Dwarf

3 AnswersAstronomy & Space1 year ago### For an intermediate mass star Helium fusion occurs on the?

A. Main Sequence

B. Giant Branch

C. Sub-giant Branch

D. Horizontal Branch

5 AnswersAstronomy & Space1 year ago