The coefficient of linear expansion of steel is 12 × 10-6 K-1. What is the change in length of a 25-m steel bridge span when it undergoes a temperature change of 40 K?
A) 1.2 cm
B) 1.4 cm
C) 1.6 cm
D) 1.8 cm
E) 2.0 cm
A
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Waves from a radio station with a wavelength of 900 m arrive at a home receiver a distance 50 km away from the transmitter by two paths. One arrives via a direct-line path and the second by reflection from a mountain directly behind the receiver. What is the minimum distance between the mountain and receiver such that destructive interference occurs at the location of the listener? Assume no
phase change on reflection. a. 675 m c. 450 m b. 900 m d. 225 m
Is there any actual evidence that our solar system originate from a collapsing cloud of gas, as described in the textbook?
A) Evidence comes from observations of Earth's oldest rocks. B) Evidence comes from observations of gas clouds around new stars elsewhere in our galaxy. C) Evidence comes from observations of the moon, meteorites, other planets, and other moons. D) All of the above. E) No, this description is based only on the theory of gravity and other theories.
Torque: A man in a gym is holding an 8.0-kg weight at arm's length, a distance of 0.55 m from his shoulder joint. What is the torque about his shoulder joint due to the weight if his arm is held at 30° below the horizontal?
A. 22 N ? m B. 2.2 N ? m C. 4.4 N ? m D. 13 N ? m E. 37 N ? m
When you adjust a telescope to get a clear image of Saturn's rings, there is a perceptible interaction between
A) you and the telescope. B) you and Saturn's rings. C) both of these D) neither these