The initial speed of a cannon ball is 0.20 km/s. If the ball is to strike a target that is at a horizontal distance of 3.0 km from the cannon, what is the minimum time of flight for the ball?
a. 16 s
b. 21 s
c. 24 s
d. 14 s
e. 19 s
a
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A wire has a strain of 0.10%. If the wire has an un-stretched length of 5.00 m, then the change in length of the wire is
A. 5.0 mm. B. 7.0 mm. C. 9.0 mm. D. 10 mm. E. 15 mm.
Waves on a String: A wire that is 1.0 m long with a mass of 90 g is under a tension of 710 N. When a transverse wave travels on the wire, its wavelength is 0.10 m and its amplitude is 6.5 mm. What is the frequency of this wave?
A. 890 Hz B. 920 Hz C. 1000 Hz D. 1200 Hz E. 1500 Hz
In terms of the global warming that has been occurring on Earth over the past few decades, what is the key message from this figure?
A) Changes in the Sun's energy output (irradiance) cannot explain the observed warming. B) The Sun's energy output (irradiance) tracks quite well with the observed warming trend. C) The Sun's energy output (irradiance) and Earth's global average temperature both vary in an 11-year cycle. D) Scientists have no way to explain the observed global warming trend.
Chondritic meteorites provide important clues because they are believed to
A. contain grains from the first material that condensed out of the Solar nebula. B. be the only source of the necessary amino acids required for life. C. be the source of all coal found on Earth. D. contain many rare metals.