A seagull flying at 10 km/h in a 10-km/h crosswind has a resultant speed of
A) 10 km/h.
B) about 14 km/h.
C) 20 km/h.
D) more than 20 km/h.
Answer: B
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A car starts from rest and accelerates uniformly at 3 m/s2. A second car starts from rest 6 s later at the same point and accelerates uniformly at 5 m/s2. How long does it take the second car to overtake the first car?
A) 24.0 s B) 12.2 s C) 35.0 s D) 18.9 s E) 22.7 s
Suppose you electrically charge a comb by running it through your hair. If you then shake this comb back and forth one time every second, you will create
A) an electromagnetic wave having a frequency of 1 Hz and a speed of 300,000 km/s. B) a sound wave having a frequency of 1 Hz and a speed of 300,000 km/s. C) an electromagnetic field that vibrates at a frequency of 1 Hz, but no electromagnetic wave is created. D) the tooth fairy. E) a sound wave having a wavelength of 300,000 km and a speed of 300,000 km/s.
The heat capacity of an object is:
A. the amount of heat energy that raises its temperature by 1? C B. the amount of heat energy that changes its state without changing its temperature C. the amount of heat energy per kilogram that raises its temperature by 1? C D. the ratio of its specific heat to that of water E. the change in its temperature caused by adding 1 J of heat
Suppose that a Ferrari and a Porsche begin a race with a moving start, and each moves with constant speed. One lap of the track is 2 km. The Ferrari laps the Porsche after the Porsche has completed 9 laps
If the speed of the Ferrari had been 10 km/h less, the Porsche would have traveled 18 laps before being overtaken. What were the speeds of the two cars?