PHYSICS HIGH SCHOOL

1) A sound wave with a frequency of 300 hertz is traveling through a medium at a speed of 320 meters/second. What is its wavelength? 2) A sound wave has a wavelength of 0.450 meters. If its speed in cold air is 330 meters/second, what is the wave's frequency?
a.0.890hertz
b.100hertz
c.230hertz
d.733

Answers

Answer 1
Answer: 1. The wavelength is the ratio of the wave's speed to its frequency in hertz or 1/s. This is shown below,
                           λ = s / f = (320 m/s)  / (300 1/s) = 1.07 m
The wavelength is approximately 1.07 m.

2. The frequency is the ratio between speed and the wavelength,
                        f = (330 m/s) / 0.45 m = 733.33 hertz

 
Answer 2
Answer:

1. The wavelength is the ratio of the wave's speed to its frequency in hertz or 1/s. This is shown below,

                          λ = s / f = (320 m/s)  / (300 1/s) = 1.07 m

The wavelength is approximately 1.07 m.


2. The frequency is the ratio between speed and the wavelength,

                       f = (330 m/s) / 0.45 m = 733.33 hertz

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A 25-gram paper cup falls from rest off the edgeof a tabletop 0.90 meter above the floor. If the
cup has 0.20 joule of kinetic energy when it hits
the floor, what is the total amount of energy
converted into internal (thermal) energy during
the cup’s fall?
(1) 0.02 J (3) 2.2 J
(2) 0.22 J (4) 220 J

Answers

So a cup falls from the table top to the ground and acquires 0.20 J of kinetic energy in the moment it hits the ground and we want to know what is the total amount of energy converted into thermal energy. While it is on the table, the cup has potential energy and the kinetic energy is 0. The potential energy of the cup is Ep=m*g*h where m=mass of the cup, g= gravitational acceleration of 9.81m/s^2 and h=height of the table. So Ep=0.025*9.81*0.9=0.220725 J. That potential energy converts into kinetic energy and into thermal energy via friction that the air is causing. So Ep=Ek+Efriction. From here: Efriction=Ep-Ek=0.220725 J-0.20J=0.020725J So the correct answer is (1) 0.02J

A stone is thrown horizontally at 8.0 m/s from a cliff 78.4 m high. How far from the base of the cliff does the stone strike the ground?

Answers

A stone is thrown horizontally at 8.0 m/s from a cliff 78.4 m high.  The distance from the base of the cliff does the stone strike the ground is 64 m.

What is distance?

Distance is defined as the entire path traveled by an object in motion, regardless of journey direction. Three sight distances are primarily taken into account in the geometric design of road construction. Things that can be measured in terms of length include the dimensions of a section or a room. Distance is the separation between two things, like two cities or two points. There will never be a negative value for either length or distance.

A projectile is an object that is launched vertically into the air and moves while being pulled by gravity. A horizontally launched object that defies gravity is referred to as a projectile.

Thus, a stone is thrown horizontally at 8.0 m/s from a cliff 78.4 m high.  The distance from the base of the cliff does the stone strike the ground is 64 m.

To learn more about distance, refer to the link below:

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64 meters

How strong does an earthquake have to be to cause a tsunami

Answers

Answer:

An earthquake with the magnitude of more than 7.5 on the Richter scale can cause to a destructive Tsunami.

Explanation:

  • According to International Tsunami Information center, the cause of the most destructive tsunami is shallow and large earthquake with the epicenter or fault line on the ocean floor or near the ocean floor.
  • When the tectonic plates (are pieces of earth's crust and uppermost mantle) are collided with each other then the earthquake occurs. This results in the displacement of large area of ocean floor from few km to 1000 km or more. This displacement of ocean floor in the formation of tsunami waves.
  • Like in the 1960, the tsunami in Chile was resulted due to earthquake with the magnitude of 9.5 on Richter scale with rupture area of over 1000 km. This tsunami not only cause destruction in Chile but also affected the other countries like Japan.

How does heat differ from thermal energy

Answers

Ok, so the easiest thing to do would be to first figure out the definitions, and then compare the terms from there. So, thermal energy is basically the inside or internal temperature thats part of a system due to its temperature. And, the definition of heat is high in temperature, or or something having the quality of being hot. So, if you use those definitions, you can come up with various differences. One of those differences could be that heat is the overall temperature or measure of the heat of an object, while thermal energy can be measured as the kinetic energy held within free particles or, the thermal energy per particle.

Final answer:

Thermal energy is the total internal kinetic energy due to the random motion of particles in an object, while heat is a form of energy transfer that happens due to a temperature difference between two objects or systems.

Explanation:

Heat and thermal energy are related concepts in physics but they are not the same thing. Thermal energy is the total internal kinetic energy of an object due to the random motion of its atoms and molecules. It is dependent on the temperature, mass, and type (or specific heat) of the material.

Heat, on the other hand, is a form of energy transfer that occurs due to a temperature difference between two objects or systems. It is the process of transfer of thermal energy from a hotter object to a cooler one. So, heat is a form of thermal energy in transit, typicallyg transferrin from areas of high temperature to areas of low temperature.

Learn more about difference between heat and thermal energy here:

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A cylindrical water tank has a radius of 3 yards in the 7.5 yards high what is the volume of the tank

Answers

To calculate the volume of a cylindrical water tank, you can use the formula for the volume of a cylinder:

Volume = π * r^2 * h

Where:

- π (pi) is approximately 3.14159

- r is the radius of the cylinder

- h is the height of the cylinder

In this case, the radius (r) is 3 yards, and the height (h) is 7.5 yards. Plug these values into the formula:

Volume = π * (3 yards)^2 * 7.5 yards

Volume ≈ 3.14159 * (9 square yards) * 7.5 yards

Now, calculate the volume:

Volume ≈ 3.14159 * 67.5 cubic yards

Volume ≈ 212.05325 cubic yards

So, the volume of the cylindrical water tank is approximately 212.05 cubic yards.

A submarine is 46 m below sea level, and it descends 24 m. How far below sea level is it? a. The submarine is 70 m below sea level. b. The submarine is 46 m below sea level. c. The submarine is 24 m below sea level. d. The submarine is 94 m below sea level.

Answers

Answer:70 m below

Explanation:

46 +24= 70
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