A racing car accelerates uniformly from rest along a straight track. This track has markers spaced at equal distances along it from the start, as shown in the figure. The car reaches a speed of 140 km/h as it passes marker 2
Where on the track was the car when it was traveling at 70 km/h?
A) Before marker 1
B) At marker 1
C) Between marker 1 and marker 2
Answer: A
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Doubling the number of effective opaque layers in a planet’s atmosphere from n to 2n will make its average surface temperature increase by what factor?
A. 2 B. 21/4 C. 31/4 D. (2 + 1/n)1/4 E. [2 + 1/(n+1)]1/4 F. Some other factor (specify) T. The factor depends on the planet’s initial temperature.
The amount of light reflected from the front surface of a common windowpane is about
A) 4%. B) 8%. C) 40%. D) 92%. E) 96%.
When a wave is ______________, the angle of reflection equals the angle of incidence
Fill in the blank(s) with correct word
A long solenoid (diameter = 5.0 cm) is wound with 960 turns per meter of thin wire through which a current of 300 mA is maintained. A wire carrying 12 A is inserted along the axis of the solenoid. What is the magnitude of the magnetic field at a point 2.0 cm from the axis?
a. 0.41 mT b. 0.48 mT c. 0.38 mT d. 0.56 mT e. 0.24 mT