Question

answer the following question in 30 to 40 words
Q. 1 distinguish between sliding friction and rolling friction ?
Q. 2 low frequency sound is faint while high-frequency sound .Do you is load do you support this statement ? why or why not ?
Q. 3- 1 .list two short terms effect of noise pollution on human
2 state two ways to minimise noise pollution
Q. 4 Two astronauts cannot talk to each other in space without a wireless radio why ?
Answer the following question in 60 to 80 words ?
Q. 1 State two advantages and two disadvantages of friction ?
Q. 2 what are the two properties of pressure exerted by liquid? give one example each to explain this property?
answer



Please give me the all correct answer ​

Answer 1

Explanation:

(a)Rolling friction takes place when an object rolls on the surface. Sliding friction takes place when two surfaces are rubbed against each other. Rolling friction takes place due to the deformation of surfaces.

b.A sound waveform has three basic physical attributes: frequency, amplitude, and temporal variation. Frequency refers to the number of times per second that the vibratory pattern (in the time domain) oscillates. Amplitude refers to sound pressure. There are many aspects to the temporal variation of sound, such as sound duration. Sound pressure is proportional to sound intensity (in units of power or energy), so sound magnitude can be measured in units of pressure, power, and energy. The common measure of sound level is the decibel (dB), in which the decibel is the logarithm of the ratio of two sound intensities or two sound pressures. Frequency is measured in units of hertz (Hz), cycles per second. Measures of time are expressed in various temporal units or can be translated into phase measured in angular degrees. Below are some definitions of terms and measures used to describe sound.(c) approximately 20 to 20000 Hz.

Answer 2

Answer:

• Rolling friction takes place when an object rolls on the surface. Sliding friction takes place when two surfaces are rubbed against each other. Rolling friction takes place due to the deformation of surfaces.

• A wind turbine, a roaring crowd at a football game, a jet engine running full throttle: Each of these things produces sound waves that are well below the frequencies humans can hear. But just because you can't hear the low-frequency components of these sounds doesn't mean they have no effect on your ears.

• 1. Other than hearing damage, it's been established that sleep disturbance is the most harmful effect of environmental noise pollution. Short-term effects of poor sleep are mood changes, daytime sleepiness, and decreased cognitive abilities. One significant long-term effect of poor sleep is cardiovascular disease.
• 2. We can reduce noise Pollution by following below mentioned Tips:

1. Turn off Appliances at Home and offices.
2. Shut the Door when using noisy Machines.