Which of the following is true?
1.A moving car with constant acceleration can never stop and stay stopped.
2.If a car is traveling eastward, its acceleration is eastward.
3.If a car is slowing down, its acceleration must be negative.
4.If a car is speeding up, its acceleration must be greater than zero.
1
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An astronomer surveying the sky toward a random region of the sky finds, by chance, the most distant galaxy ever detected. This is an example of
A) nonscience B) discovery science C) hypothesis-driven science D) pseudoscience
A plane has an eastward heading with an airspeed of 156 m/s. A 20.0 m/s wind is blowing southward at the same time as the plane is flying. The velocity of the plane relative to the ground is
A) 155 m/s at an angle 7.36° south of east. B) 155 m/s at an angle 7.36° east of south. C) 157 m/s at an angle 7.31° south of east. D) 157 m/s at an angle 7.31° east of south. E) 157 m/s at an angle 7.36° south of east.
Reflection, refraction, and the formation of images by mirrors and lenses has been successful described by the
A) wave model of light. B) ray model of light. C) particle model of light. D) electro model of light. E) none of the given answers
A white boat sunk in water where sunlight is dim appears
A) red. B) yellow. C) cyan. D) no color–black.