A 2.0-kg object moving 3.0 m/s strikes a 1.0-kg object initially at rest. Immediately after the collision, the 2.0-kg object has a velocity of 1.5 m/s directed 30° from its initial direction of motion. What is the y component of the velocity of the 1.0-kg object just after the collision?
a. ?3.7 m/s
b. ?3.4 m/s
c. ?1.5 m/s
d. ?2.4 m/s
e. ?4.1 m/s
c
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Which of the following statements is true of the analysis called helioseismology?
A) The solar interior is observed using the light that emerges from below the photosphere. B) The cause of the 22-year cycle of sunspots is studied using the Sun's unchanged magnetic field. C) The vibrations in the Sun are used by solar astronomers to explore its depths. D) The unaltered electron orbits are detected when an atom is in a magnetic field.
How is proper motion measured?
What will be an ideal response?
The image of an object beneath the surface of a medium of refractive index n> 1 is seen in air by a person looking down on the surface. This image, formed by light rays leaving the flat refractive surface, is
A. real and closer to the viewer than the object. B. virtual and closer to the viewer than the object. C. real and farther from the viewer than the object. D. virtual and farther from the viewer than the object. E. virtual and the same distance from the viewer as the object.
What is the root-mean-square speed of chlorine gas molecules at a temperature of 346 K? (R = 8.31 J/mol/K, NA = 6.02 × 10^23, and the molecular mass of Cl2 = 71)
a. 1.1E+2 m/s b. 3.5E+2 m/s c. 8.2E+4 m/s d. 1.2E+5 m/s e. 3.5E+4 m/s