Superguy is flying at treetop level near Paris when he sees the Eiffel Tower elevator start to fall (the cable snapped). His x-ray vision tells him Lois LaTour is inside. If Superguy is 1.00 km away from the tower, and the elevator falls from a height of 230 m, how long does Superguy have to save Lois, and what must be his average speed?
a. 4.84 s, 206 m/s
b. 8.39 s, 119 m/s
c. 6.85 s, 150 m/s
d. 9.69 s, 103 m/s
e. 3.43 s, 292 m/s
c
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Why does the burning of fossil fuels increase the greenhouse effect on Earth?
A) Burning depletes the amount of ozone, thereby warming the planet. B) Burning fuel warms the planet. C) Burning produces infrared light, which is then trapped by existing greenhouse gases. D) Burning releases carbon dioxide into the atmosphere. E) All of the above are true.
A 20 cm long organ pipe is filled with air and is open at one end and closed at the other. The velocity of sound in air at 0
is 331 m/s. What is the wavelength of the fundamental mode?
A. 40 cm B. 60 cm C. 80 cm D. 43 cm E. 75 cm
The Phanerozoic eon is divided into three main
A) epochs B) periods C) eras D) ages
A small sphere with a mass of 441 g is moving upward along the vertical +y-axis when it encounters an electric field of 5.00 N/C
If, due to this field, the sphere suddenly acquires a horizontal acceleration of 13.0 m/s2 , what is the charge that it carries? A) 1.15 C B) -1.15 C C) 1150 C D) -1150 C