A hoop, solid sphere, and solid cylinder each have the same mass and same radius.When rolling down the same incline, which has the greatest torque from gravity on it?
a. the hoop
c. the cylinder
b. the sphere
d. They all have the same torque.
D
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The majority of stars in the Milky Way appear to be in the ________.
A. Sagittarius A* region B. 6,000 K to 10,000 K temperature range C. O and B spectral type D. mass range of 0.1 to 0.5 solar masses
A 3.0-kg mass sliding on a frictionless surface has a velocity of 5.0 m/s east when it undergoes a one-dimensional inelastic collision with a 2.0-kg mass that has an initial velocity of 2.0 m/s west. After the collision the 3.0-kg mass has a velocity of 1.0 m/s east. How much kinetic energy does the two-mass system lose during the collision?
a. 22 J b. 24 J c. 26 J d. 20 J e. 28 J
Why are there no impact craters on the surface of Io?
A) Io is too small to have experienced many impacts. B) Jupiter's strong gravity prevents impacts from hitting Io. C) All of Io's impact craters have been buried by lava flows. D) Any impact craters that once existed on Io were eroded by winds and rain. E) Io formed only recently, long after the heavy bombardment ended.
The threshold wavelength for photoelectric emission of a particular substance is 500 nm. What is the work function (in eV)?
a. 4.2 b. 4.0 × 10^-19 c. 4.0 × 10^-10 d. 2.5 × 10^-19 e. 2.5