3 years ago

Any two ways to reduce sound pollution

Physics

1 answer:

charle [14.2K]3 years ago

8 0

Answer:

use earplugs

stay away from noisy areas

lower the volume

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Question 16 of 20

ankoles [38]

Answer:

Explanation:

6 0

3 years ago

A bullet with a mass ????b=13.5 g is fired into a block of wood at velocity ????b=249. The block is attached to a spring that ha

larisa86 [58]

Answer:

$M = 0.436 kg$

Explanation:

As per energy conservation we can say that energy stored in the spring at the position of maximum compression must be equal to the kinetic energy of bullet and block system

so here we have

$\frac{1}{2}(m + M)v^2 = \frac{1}{2} kx^2$

here we know that

k = 205 N/m

x = 35 cm

$\frac{1}{2}(m + M)v^2 = \frac{1}{2}(205)(0.35)^2$

now by momentum conservation we know that

$mv_o = (m + M)v$

$v = \frac{m}{m + M} v_o$

now plug in all values in it

$v = \frac{0.0135}{0.0135 + M}(249)$

now from above equation

$\frac{1}{2}(0.0135 + M)( \frac{0.0135}{0.0135 + M}(249))^2 = 12.56$

$\frac{5.65}{0.0135 + M} = 12.56$

by solving above equation we have

$M = 0.436 kg$

3 0

4 years ago

1) Do liquids and gases also exert pressure?

Marta_Voda [28]

Explanation:

Liquids also exert pressure in all directions on the walls of the container they are stored in. We see water coming out from leaking pipes and taps. ... Gases (Air) also exert pressure in all directions

6 0

3 years ago

Read 2 more answers

What is the mathematical formula for relating velocity, wavelength, and frequency?

Makovka662 [10]

Http://www.emc2-explained.info/Speed-Frequency-and-Wavelength/

5 0

3 years ago

The average kinetic energy of the particles in a sample of matter is expressed as

vredina [299]

Answer: 3/2 ×KT

Explanation: The average kinetic energy of particles (molecules) in a simple matter is given as

K.E = 3/2 ×KT

where K = boltzman constant and and T = absolute temperature.

7 0

3 years ago