Plane Mirrors: A person jogs toward a plane mirror at a speed of 3 m/s. How fast is he approaching his image in the mirror?
A. 1 5 m/s
B. 3 m/s
C. 4 m/s
D. 5 m/s
E. 6 m/s
Answer: E
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In any particular place on Earth, certain constellations are visible in the evening only at certain times of the year because ________
A) our evening view of space depends on where Earth is located in its orbit around the Sun B) some constellations are circumpolar C) on any particular night, we can only see stars that are directly opposite (180 degrees away from) the Sun in the sky D) during some times of year, some constellations drop below the southern horizon
If we were to measure Hubble's constant 10 billion years in the future, we would find it exactly the same as it is today
Indicate whether the statement is true or false
One of the most efficient engines built so far has the following characteristics: combustion chamber temperature = 1900°C; exhaust temperature = 430°C. 7.0 × 109 cal of fuel produces 1.4 × 1010 J of work in one hour
What is the power output, in hp, of this engine?
The __________ states that a particle cannot be precisely localized
Fill in the blank(s) with correct word