Beings on spherical asteroid ? have observed that a large rock is approaching their asteroid in a collision course. At 7514 km from the center of the asteroid, the rock has a speed of 136.0 m/s and later at 2823 km it has a speed of 392.0 m/s
Use energy conservation to find the mass of asteroid ?. You can neglect any effects due to the parent star of the asteroid. (G = 6.67 × 10-11 N ? m2/kg2) A) 4.582 × 1021 kg
B) 9.164 × 1027 kg
C) 6.112 × 1028 kg
D) 4.582 × 1020 kg
A
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Friction: A bulldozer attempts to drag a log weighing 500 N along the rough horizontal ground. The cable attached to the log makes an angle of 30° above the ground. The coefficient of static friction between the log and the ground is 0.50, and the coefficient of kinetic friction is 0.35. What minimum tension is required in the cable in order for the log to begin to slide?
Fill in the blank(s) with the appropriate word(s).
Copernicus
A) provided strong observational evidence that the Earth moved about the Sun B) proved that the orbital shapes of the planets were ellipses and not circles C) was the first person to suggest the Earth moved around the Sun D) revived Aristarchus's suggestion of a Sun-centered solar system and described it mathematically
What is the simplest way we might detect life on an extrasolar planet?
A) listen for radio signals coming from an advanced civilization on the planet B) wait for aliens from the planet to visit us C) analyze the spectrum of reflected light from the planet D) send an interstellar probe to the planetary system
A 10-inch telescope is used to determine if what appears to be one star is actually two stars. Stars are so far away that they are essentially point sources
How close, in angle, can two stars be and still be resolved by this telescope? Use a wavelength of 550 nm. A) 4.2 × 10-8 degree B) 2.64 × 10-6 degree C) 3.0 × 10-4 degree D) 1.5 × 10-4 degree E) 6.6 × 10-8 degree