Suppose we look at two distant galaxies: Galaxy 1 is twice as far away as Galaxy 2. In that case
A) we are seeing Galaxy 1 as it looked at an earlier time in the history of the universe than Galaxy 2.
B) we can't say anything about these galaxies except for their distances.
C) we are seeing Galaxy 1 as it looked at a later time in the history of the universe than Galaxy 2.
A) we are seeing Galaxy 1 as it looked at an earlier time in the history of the universe than Galaxy 2.
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A factory siren indicating the end of a shift has a frequency of 90.0 Hz
(a) What frequency is perceived by the occupant of a car traveling towards the factory at 25 m/s? (b) What frequency is perceived by the occupant of a car traveling away from the factory at 30 m/s?
The figure shows the distance versus time graph of an object
The acceleration of the moving object is a non-zero constant.
a.
True
b.
False
Sunspots are cooler than the surrounding region of the Sun's surface
Indicate whether the statement is true or false
Power: The figure shows a graph of the power dissipated in a resistor as a function of the resistance. What quantity does the slope of this graph represent?
A. the current in the resistor B. the potential difference across the resistor C. the reciprocal of the current in the resistor D. the square of the current in the resistor E. the resistivity of the resistor