Question
Earthquakes are essentially sound waves—called seismic waves—traveling through the earth. Because the earth is solid, it can support both longitudinal and transverse seismic waves. The speed of longitudinal waves, called P waves, is 8000 m/s Transverse waves, called S waves, travel at a slower 4500 m/s. A seismograph records the two waves from a distant earthquake. The S wave arrives 2.0 min after the PP wave.How far away is the Earthquake. Assume that the waves travel in straight lines, although actual seismic waves follow more complex routes.
Answer:
The distance is
Explanation:
From the question we are told that
The speed of longitudinal seismic wave is
The speed of Transverse seismic wave is
The time difference between the arrival of longitudinal seismic with respect to Transverse waves is
Generally the time difference between the arrival of longitudinal seismic with respect to Transverse waves is mathematically represented as
=>
=>
=>
=>
The correct answer is D. Tightly packed particles in solids slow down the light waves; however, sound waves make particles bounce into each other, so they travel faster in solids.
Explanation:
The experiment compares the speed of light and sound in different mediums (gas, liquid, and solid). The charts show sound travels faster in a solid medium (ice) than in liquids or gases as the speed in ice was 3200 m/s, while in the liquid was 1500 m/s and in the gas was 346 m/s. Thus, sound waves travel faster in solids, which occurs because for sound to travel particles need to bounce or vibrate, which occurs faster in solids as particles are packed together.
On the other hand, the data about light shows this travels faster in gases (air) because in this medium the speed of light is , while in a solid the speed is . This shows opposite to sound, light travels faster in gases, and therefore, the tightly packed particles of soil only slow down light waves.
Answer:
Mass = 27.6 grams
Explanation:
Given the following data;
Density of ice = 0.92g/cm³
Volume = 30cm³
To find mass of ice;
Density can be defined as mass all over the volume of an object.
Simply stated, density is mass per unit volume of an object.
Mathematically, density is given by the equation;
Making mass the subject of formula, we have;
Mass = 27.6 grams
Therefore, the mass of ice is 27.6 grams.
Answer:
57.6Joules
Explanation:
Rotational kinetic energy of a body can be determined using the expression
Rotational kinetic energy = 1/2Iω²where;
I is the moment of inertia around axis of rotation. = 5kgm/s²
ω is the angular velocity = ?
Note that torque (T) = I¶ where;
¶ is the angular acceleration.
I is the moment of inertia
¶ = T/I
¶ = 3.0/5.0
¶ = 0.6rad/s²
Angular acceleration (¶) = ∆ω/∆t
∆ω = ¶∆t
ω = 0.6×8
ω = 4.8rad/s
Therefore, rotational kinetic energy = 1/2×5×4.8²
= 5×4.8×2.4
= 57.6Joules