Elasticity

Young's modulus for bone is about 1.0 x 10^10 Pa. Bone can take only about a 1.0% change in its length before fracturing. a.) What is the maximum force that can be applied to a bone whose minimum cross sectional area is 3.0 cm^2? b.) estimate from what maximum height a 70 kg person (one weighing about 150lb) could jump and not fracture the tibia. Take the time between when the person first touches the floor and when he or she has stopped to be .020 s, and assume that the stress is distributed equally between the person's two legs.

Simple Harmonic Motion

general equation of simple harmonic motion, x= A cos (wt + Ф0) , can be written in the equivalent form x = B sin wt + C cost wt. a) Find the expression for the amplitudes B and C in terms of the amplitude A and the initial phase angle Ф0. b) Interpret these expressions in terms of a phasor diagram.

Continuous Probability Distribution - Escape Velocities of Hydrogen Molecules

The surface of the sun has a temperature of about 5800K and consists largely of hydrogen atoms. We're given that the rms speed of a hydrogen atom at this temperature is 1.20*10^4m/s and the escape speed for a particle is 6.20*10^5m/s. Can appreciable quantities of hydrogen escape from the sun? Can any hydrogen escape? What fraction of the H atoms have v_z > 6.20*10^5m/s?

2 convex lenses

Hello, I have a question for an algebra based physics course. Here goes, A convex lens of focal length 7.5 cm is placed 12 cm to the left of a convex lens with a focal length of 6.5 cm. An object is placed 10.0 cm to the left of the lens with a focal length of 7.5 cm. Find the location of the image and its character (e.g., real, inverted) (A ray diagram may prove to be helpful also). Thank you for any help that you can provide!

Physics

A convex lens of focal length 7.5 cm is placed 12 cm to the left of a convex lens with a focal length of 6.5 cm. An object is placed 10.0 cm to the left of the lens with a focal length of 7.5 cm. Find the location of the image and its character (e.g., real, inverted) (A ray diagram may prove to be helpful also).