Why do researchers believe that asteroids in the asteroid belt are primal rocks that did not merge into a planet?
A) The total mass of the asteroids in the asteroid belt is much smaller than that of any terrestrial planet in our solar system.
B) The differences in chemical compositions of the asteroids are too large for them to have originated in a single body.
C) Jupiter's gravity could have prevented these objects merging into a single body.
D) All of the above.
E) None of the above.
D
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Impulse: Three cars, car X, car Y, and car Z, begin accelerating from rest at the same time. Car X is more massive than car Y, which is more massive than car Z. The net accelerating force exerted on each car is identical. After 10 seconds, which car has the most amount of momentum?
A. They all have the same amount of momentum. B. Car X C. Car Y D. Car Z
A proton with velocity 2.0 × 105 m/s enters a region where a uniform magnetic field of 0.30 T is present. The proton's velocity makes an angle of 60° with the magnetic field
What is the pitch of the helical path followed by the proton? (The "pitch" is the distance traveled parallel to the magnetic field while making one complete revolution around a magnetic field line.) A) 0.022 m B) 0.140 m C) 0.077 m D) 0.250 m E) 0.055 m
Stan argues that momentum cannot be conserved when a collision is not a head-on collision. Rachel insists it is conserved because each body receives an impulse of equal magnitude. Rachel is correct because
a. each body exerts an equal and opposite force on the other during the collision. b. the forces act during equal time intervals. c. the law of conservation of momentum for an isolated system is a vector equation. d. of all of the above. e. of only (a) and (b) above.
A single-crystal wafer of silicon is to be used as a substrate for the deposition of thin-metal films that could be affected by the substrate’s crystallographic orientation. However, the crystallographic orientation of this particular wafer is not known. The wafer is placed in an x-ray diffractometer with a copper x-ray tube with a K? x-ray line at 0.1542 nm, and an intense peak is measured at an angle of 29.46°. Silicon is FCC with a lattice parameter of 0.543 nm. What planes are parallel to the surface of this silicon crystal?
What will be an ideal response?