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On July 10, 1996, a granite block broke away from a wall in Yosemite Valley and, as it began to slide down the wall, was launched into projectile motion. Seismic waves produced by its impact with the ground triggered seismographs as far away as 200 km. Later measurements indicated that the block had a mass between 7.3 × 107 kg and 1.7 × 10® kg and that it landed 500 m vertically below the launch point and 30 m horizontally from it. (The launch angle is not known.) Assume the mass to be 13 × 107 kg. (a) Estimate the block's kinetic energy just before it landed. Consider two types of seismic waves that spread from the impact point – a hemispherical body wave traveled through the ground in an expanding hemisphere and a cylindrical surface wave traveled along the ground in an expanding shallow vertical cylinder (see the figure). Assume that the impact lasted 0.45 s, the vertical cylinder had a depth d of 5.2 m, and each wave type received 21% of the energy the block had just before impact. Neglecting any mechanical energy loss the waves experienced as they traveled, determine the intensities of (b) the body wave and (c) the surface wave when they reached a seismograph 200 km away. (d) On the basis of these results, which wave is more easily detected on a distant seismograph? -Cylindrical wave -Impact -Hemispherical wave

On July 10, 1996, a granite block broke away from a wall in Yosemite Valley and, as it began to slide down the wall, was launched into projectile motion. Seismic waves produced by its impact with the ground triggered seismographs as far away as 200 km. Later measurements indicated that the block had a mass between 7.3 × 107 kg and 1.7 × 10® kg and that it landed 500 m vertically below the launch point and 30 m horizontally from it. (The launch angle is not known.) Assume the mass to be 13 × 107 kg. (a) Estimate the block's kinetic energy just before it landed. Consider two types of seismic waves that spread from the impact point – a hemispherical body wave traveled through the ground in an expanding hemisphere and a cylindrical surface wave traveled along the ground in an expanding shallow vertical cylinder (see the figure). Assume that the impact lasted 0.45 s, the vertical cylinder had a depth d of 5.2 m, and each wave type received 21% of the energy the block had just before impact. Neglecting any mechanical energy loss the waves experienced as they traveled, determine the intensities of (b) the body wave and (c) the surface wave when they reached a seismograph 200 km away. (d) On the basis of these results, which wave is more easily detected on a distant seismograph? -Cylindrical wave -Impact -Hemispherical wave

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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View Policies Current Attempt in Progress On July 10, 1996, a granite block broke away from a wall in Yosemite Valley and, as it began to slide down the wall, was launched into projectile motion. Seismic waves produced by its impact with the ground triggered seismographs as far away as 200 km. Later measurements indicated that the block had a mass between 7.3 × 107 kg and 1.7× 108 kg and that it landed 500m vertically below the launch point and 30 m horizontally from it. (The launch angle is not known.) Assume the mass to be 13 x 107 kg. (a) Estimate the block's kinetic energy just before it landed. Consider two types of seismic waves that spread from the impact point – a hemispherical body wave traveled through the ground in an expanding hemisphere and a cylindrical surface wave traveled along the ground in an expanding shallow vertical cylinder (see the figure). Assume that the impact lasted 0.45 s, the vertical cylinder had a depth d of 5.2 m, and each wave type received 21% of the energy the block had just before impact. Neglecting any mechanical energy loss the waves experienced as they traveled, determine the intensities of (b) the body wave and (c) the surface wave when they reached a seismograph 200 km away. (d) On the basis of these results, which wave is more easily detected on a distant seismograph? -Cylindrical -Impact wave d -Hemispherical wave (a) Number i Units (b) Number i Units (c) Number i Units (d)
Transcribed Image Text:View Policies Current Attempt in Progress On July 10, 1996, a granite block broke away from a wall in Yosemite Valley and, as it began to slide down the wall, was launched into projectile motion. Seismic waves produced by its impact with the ground triggered seismographs as far away as 200 km. Later measurements indicated that the block had a mass between 7.3 × 107 kg and 1.7× 108 kg and that it landed 500m vertically below the launch point and 30 m horizontally from it. (The launch angle is not known.) Assume the mass to be 13 x 107 kg. (a) Estimate the block's kinetic energy just before it landed. Consider two types of seismic waves that spread from the impact point – a hemispherical body wave traveled through the ground in an expanding hemisphere and a cylindrical surface wave traveled along the ground in an expanding shallow vertical cylinder (see the figure). Assume that the impact lasted 0.45 s, the vertical cylinder had a depth d of 5.2 m, and each wave type received 21% of the energy the block had just before impact. Neglecting any mechanical energy loss the waves experienced as they traveled, determine the intensities of (b) the body wave and (c) the surface wave when they reached a seismograph 200 km away. (d) On the basis of these results, which wave is more easily detected on a distant seismograph? -Cylindrical -Impact wave d -Hemispherical wave (a) Number i Units (b) Number i Units (c) Number i Units (d)
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