Which of these children would be the best candidate for a selective dorsal rhizotomy?

The nuclei in the molecule CO (carbon monoxide) are 0.1128 nm apart.  The mass of the most common carbon atom is 1.993 x 10-26 kg, while the mass of the most common oxygen atom is 2.656 x 10-26 kg.  If the energy of the rotating molecule is described by the classical expression

The gap between the valence and conduction bands in diamond is 5.47 eV.  What is the maximum wavelength of a photon that can excite an electron from the top of the valence band into the conduction band?  Express your answer in nanometers.

Which of the following statements are true concerning a good conductor? There may be more than one answer

In which lift would the use of a weight belt be most appropriate and reasonable?

Germanium has a band gap of 0.67 eV. Doping with arsenic adds donor levels in the gap 0.01 eVeV below the bottom of the conduction band. At a temperature of 300 K, the probability is 4.4×10−4 that an electron state is occupied at the bottom of the conduction band.  How far below the bottom of the conduction band is the Fermi level in this case?  Express your answer in eV.

Which of the following best describes bilateral facilitation?

Toxicity is dependent upon the [answer1] and [answer2] dose, as well as the [answer3] and [answer4] of the animal.

Suppose the coefficient of static friction of a horizontal surface is  0 . 388  and the coefficient of kinetic friction of the surface is  0 . 360 . Block A of mass  30 . 0   k g  rests on a horizontal surface (Fig. 2.1), (a) what is the magnitude and direction of the frictional force on the block? If an attached string is parallel to the surface and passes over an ideal pulley, as shown in Fig. 2.2. Block B of mass  3 . 00   k g  is attached to the dangling end of the string, (b) what is the magnitude and direction of the frictional force on block A if it rests on the horizontal surface? If the mass of block B can be changed, (c) what is the mass of block B so that block A is at the verge of motion? If the mass of block B is increased to  16 . 0   k g  (Fig. 2.3), (d) what is the magnitude and direction of the acceleration of block A, and (e) what is the tension on the string? phys1401_final_fig2.jpg

A  4 . 00   g  bullet is moving horizontally with a velocity of  355   m / s  to the right. The bullet is approaching two blocks resting on a horizontal frictionless table of height  25 . 0   c m  above the ground. Air resistance is negligible. The mass of the first block is  1150   g , and its velocity is  0 . 550   m / s  after the bullet passes through it. The mass of the second block is  1530   g . If the bullet passes completely through the first block and embeds itself in the second one, as indicated in Fig. 4.1, (a) what is the velocity of the second block after the bullet embeds itself and (b) what is the ratio of the total kinetic energy of the bullet-blocks system after the collision to the one before the collision? If the bullet passes completely through both blocks and moves with a velocity  50 . 0   m / s  after leaving the second block, as indicated in Fig. 4.2, (c) what is the velocity of the second block after the collision? After the bullet leaves the two blocks, the first block collides with the second block and moves with a velocity  0 . 200   m / s  after the collision (see Fig. 4.2), (d) what is the velocity of the second block after the collision with the first block? The second block eventually leaves the table and falls to the ground, (e) what is the speed of the second block right before it hits the ground? phys1401_final_fig4.jpg