An electron with an energy of 20 GeV (3.20 × 10-9 J) moving in the +x direction collides head on with a stationary proton. After the collision, the electron travels in the -x direction
What is the momentum of the electron after the collision? Note that this is an ultrarelativistic collision so that the energy of the moving masses can be approximated by the expression E ? pc. The mass of a proton is 1.67 × 10-27 kg and that of an electron is 9.11 × 10-31kg. A)
2.5 × 10-19 kg?m/s
B)
5.0 × 10-19 kg?m/s
C)
1.1 × 10-17 kg?m/s
D)
2.2 × 10-17 kg?m/s
E)
2.7 × 10-22 kg?m/s
A
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A metallic sphere A of radius 1.00 cm is several centimeters away from a metallic spherical shell B of radius 2.00 cm. Charge 450 nC is placed on A, with no charge on B or anywhere nearby. Next, the two objects are joined by a long, thin, metallic wire (as shown in Fig. 25.20), and finally the wire is removed. How is the charge shared between A and B?
The molecular building blocks of life have been found
A) only on the Earth B) on the Earth, in interstellar clouds, and in meteorites C) on the Earth and in meteorites D) on the Earth and on Mars
The following images show four planets in our solar system. Rank these planets from left to right based on the number of moons that orbit them, from highest to lowest. (Not to scale.)
What will be an ideal response?
Combinations of atoms from the far right side of the periodic table with atoms from the far left side usually form ______________ compounds
a. organic b. ionic c. covalent d. polar