A hunter wishes to cross a river that is 1.5 km wide and flows with a velocity of 5.0 km/h parallel to its banks. The hunter uses a small powerboat that moves at a maximum speed of 12 km/h with respect to the water. What is the minimum time for crossing?
What will be an ideal response?
0.14 h
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The acceleration of a ball as it rolls down a ramp is 4 m/s2 . The ball is referred to 2 s after it starts to roll. A racecar driver steps on the gas, and his racecar travels 20 meters in 2 seconds starting from rest. The acceleration of the racecar is 5 m/s2
Indicate whether the statement is true or false
Suppose the laboratory wavelength of a spectral line is 600 nm. In a star it is measured to be 599.4 nm. Is the star moving toward or away from us, relative to the line of sight? How fast is it moving? (Hint: c = 300,000 km/s)
a. toward; 300 km/s b. away; 300 km/s c. at rest; 0 km/s d. sideways; 300 km/s e. toward; 150 km/s
Magnetic field strength about a magnet is strongest where magnetic field lines are
A) closer together. B) straightest. C) most curved. D) more spread.
Reverberation is a case of
A) sound interference. B) forced vibrations. C) re-echoed sound. D) resonance. E) none of the above