In ultrasound the _____________ of the sound is much greater than in normal sound
a. frequency
b. period
c. wavelength
d. amplitude
e. speed
A
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Nanoparticles are finding many applications including medicine, magnetic permanent memory, and high strength materials. Assume that a high strength nickel alloy is to be made out of nanoparticles, and that the size of the nanoparticles is a cube 10 nm on each side. Calculate the number of atoms in these particles in two ways.
(a) For face centered cubic nickel calculate the number of atoms using only the lattice parameter of 0.352 nm from Appendix B and (b) using the density of nickel and the atomic mass from Appendix B.
Inelastic Collisions: A 1000-kg whale swims horizontally to the right at a speed of 6.0 m/s. It suddenly collides directly with a stationary seal of mass 200 kg. The seal grabs onto the whale and holds fast. What is the speed of these two sea creatures just after their collision? You can neglect any drag effects of the water during the collision.
A. 0.00 m/s B. 3.0 m/s C. 4.0 m/s D. 5.0 m/s E. 6.0 m/s
My flashlight beam makes an angle of 60. degrees with the surface of the water before it enters the water. In the water what angle does the beam make with the surface?
A) 0° B) 30° C) 60° D) 22° E) 68°
A 777 aircraft has a mass of 300,000 kg. At a certain instant during its landing, its speed is 27.0 m/s. If the braking force is 435,000 N, how much further does it travel along the runway before it comes to a stop?
A) 40.5 m B) 142 m C) 181 m D) 251 m E) 456 m