PHYSICS
COLLEGE

Answer:

Answer:

option A is correct

25% free lead and 75% lead oxide

Explanation:

we have given free lead and lead oxide %

so here we know lead oxide material usually composed in the range of for free lead and lead oxide as

lead oxide material contain free lead range is 22 % to 38 %

so here we have only option 1 which contain in free lead in the range of 22 % to 38 % i.e 25 % free lead

so

option A is correct

25% free lead and 75% lead oxide

HIGH SCHOOL

True or False? A mountain has more heat than a pot of boiling water.

Answer: false

Hope this helps

Hope this helps

No, a pot of boiling water has more heat.

HIGH SCHOOL

Blue to gray in color and reaching up to 10 feet (3.05 meters) in length and 220 pounds (99.8 kilograms) in weight, the sailfish is considered the fastest marine creature. These streamlined beasts have been clocked at 68 miles per hour (30.4 meters per second). How far does the sailfish travel in 2 minutes?

Answer:

the distance traveled by the fish is 3648 m

Explanation:

In general, animals have a small period of acceleration, which we will despise after which they travel at a constant speed so we can use the kinematic equations in uniform motion

We reduce the units to System SI

t = 2 min (60s / 1 min) = 120 s

Calculate

V = x / t

x= V t

x = 30.4 120

x = 3648 m

This is the distance traveled by the fish

HIGH SCHOOL

Please help! Will give brainliest. A guitarist is tuning a guitar. She hears a low beat every 2.0 seconds. What is the difference between the correct frequency and measured frequency of the guitar string?

The correct frequency when you tune a guitar is when you hear the right tune in your own hearing and standard. The measure frequency of a guitar string is when you measure the tune of the string correctly. This is not the same because manual tuning is affected by many factors.

HIGH SCHOOL

1) A piano tuner is testing a wire currently under 2000 N tension. The wire is 1.5 m long and has a mass of 20 g. If the tuner's computer can detect a maximum frequency of 10,000 Hz, what is the highest harmonic number the computer can detect (1 point) A) 77

B) 100

C) 25

D) 63

2) A wave is traveling with a speed of 400 m/s and it has a wavelength of 28 m. What will the frequency of the wave be if the wavelength is doubled but the speed remains the same? (1 point)

A) 9.09 Hz

B) 14.3 Hz

C) 21.7 Hz

D) 7.14 Hz

3) If a standing wave is vibrating in it's third harmonic, how many nodes does it have? (1 point)

A) 4

B) 3

C) 2

D) 1

4) An organ pipe, which is a pipe closed at one end, is 2.46 m long and the speed of sound in air in that pipe is 345 m/s. What is the frequency of the fundamental harmonic in this pipe? (1 point)

A) 44.9 Hz

B) 20.6 Hz

C) 35.1 Hz

D) 13.2 Hz

5) Using the same organ pipe from question 11, how many possible harmonics are there in the normal human hearing range of 20 Hz to 20,000 Hz? (1 point)

A) 570

B) 985

C) 101

D) 47

6) A standing wave is set up on a violin string to produce a note of A sharp Contra (58 Hz). The violin string is 32 cm long. If the sound is produced in the fundamental frequency, what is the speed of the wave moving across the string? (1 point)

A) 52.78 m/s

B) 18.83 m/s

C) 20.01 m/s

D) 37.12 m/s

1.

Answer:

N = 77

Explanation:

1) As we know that Tension in the wire is given as

T = 2000 N

now mass per unit length of the wire is given as

Now fundamental frequency is given as

now highest frequency is given as 10000 Hz

so total harmonics is given as

2.

Answer:

D) 7.14 Hz

Explanation:

As we know that

speed = (frequency)(wavelength)

given that

speed = 400 m/s

wavelength = 28 m

so frequency is given as

now if wavelength is doubled then we will have

new frequency will be

3.

Answer:

Number of nodes = 4

A) 4

Explanation:

Number of nodes = number of harmonics + 1

so here we know that

number of harmonics = 3

Number of nodes = 3 + 1

Number of nodes = 4

4.

Answer:

C) 35.1 Hz

Explanation:

fundamental frequency in an organ pipe closed at one end is given as

here we know that

v = 345 m/s

L = 2.46 m

now we have

5.

Answer:

A) 570

Explanation:

Number of harmonics is given as

6.

Answer:

Explanation:

For fundamental frequency we know that

here we know that

now we have