In attempting to jump up a waterfall, a salmon leaves the water 2.0 m from the base of the waterfall. With what minimum speed must it leave the water in order just to make it up a waterfall 1.6 m high?
What will be an ideal response?
8.96 m/s
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Two wheels have the same total mass M and radius R. One wheel is a uniform disk. The other is like a bicycle wheel, with lightweight spokes connecting the rim to a small hub. Which likely has the larger moment of inertia?
A. The solid disk. B. The wheel with spokes. C. The moment of inertia will be nearly the same for both. D. We need more information to answer.
An electric motor produces 2.0 hp in a Vrms = 120 V circuit. What is Irms for this motor? (1 hp = 746 W)
a. 12 A c. 0.62 A b. 6.2 A d. 1.6 A
A radioactive substance is placed in a sealed container. Three days later, only one-eighth of the sample is still radioactive. What is the half-life of the sample?
A. 4 days B. 2 days C. 1 day D. 12 hrs E. 6 hrs
Which of the following is true of Mars?
A) It is about 95 percent of Earth's diameter. B) It has a thick atmosphere rich in water vapor. C) It is the smallest planet of the Solar System. D) It has a heavily cratered crust marked by volcanoes.