The banking angle in a turn on the Olympic bobsled track is not constant, but increases upward from the horizontal. Coming around a turn, the bobsled team will intentionally "climb the wall," then go lower coming out of the turn
Why do they do this? A)
to give the team better control, because they are able to see ahead of the turn
B)
to prevent the bobsled from turning over
C)
to take the turn at a faster speed
D)
to take the turn at a slower speed
E)
to reduce the g-force on them
C
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Three objects are connected by massless wires over a massless frictionless pulley as shown in the figure. The tension in the wire connecting the 10.0-kg and 15.0-kg objects is measured to be 133 N. What is the tension in wire A?
A) 87.5 N B) 245 N C) 280 N D) 333 N E) 517 N
An electron is released from rest at a distance of 9.00 cm from a fixed proton. How fast will the electron be moving when it is 3.00 cm from the proton?
(k = 1/4??0 = 8.99 × 109 N ? m2/C2, e = 1.60 × 10-19 C, melectron = 9.11 × 10-31 kg, mproton = 1.67 × 10-27 kg) A) 75.0 m/s B) 106 m/s C) 130 m/s D) 1.06 × 103 m/s E) 4.64 × 105 m/s
You are holding on to one end of a long string that is fastened to a rigid steel light pole. After producing a wave pulse that was 5 mm high and 4 cm wide, you want to produce a pulse that is 6 cm wide and 7 mm high. You must move your hand up and down once,
a. the same distance up as before, but take a shorter time. b. the same distance up as before, but take a longer time. c. a smaller distance up, but take a shorter time. d. a greater distance up, but take a longer time. e. a greater distance up, but take the same time.
The reason that most extrasolar planets discovered by the transit technique are found close to their parent stars is
A) the closer to a star, the hotter and therefore brighter the planet is. B) they transit more frequently, and have thus been more likely to be detected in the short time we have been searching for them. C) the wavelength shift of the star's spectrum is larger. D) planets that are close to a star are heated up and therefore larger. E) more of the starlight is blocked by the planet when it transits the star.