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Kisachek [45]
3 years ago
11

What is usually true about the relationship between the speed mechanical waves travel and the temperature of the medium?

Physics
1 answer:
Bogdan [553]3 years ago
8 0
You have to change the properties of the medium that the sound waves traveling through
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A 5 kg brick is dropped from a height of 12m on a spring with a spring constant 8 kN/m. If the spring has unstretched length of
Ivan

Answer:

0.1164 m

0.49387 m

Explanation:

m = Mass = 5 kg

g = Acceleration due to gravity = 9.81 m/s²

h = Height from which brick falls = 12 m

k = Spring constant = 8 kN/m

a) Potential energy of the brick

PE=mgh\\\Rightarrow PE=5\times 9.81\times 12\\\Rightarrow PE=588.6\ J

Potential energy in spring

PE=\frac{1}{2}\times kx^2\\\Rightarrow x=\sqrt{\frac{PE\times 2}{k}}\\\Rightarrow x=\sqrt{\frac{588.6\times 2}{8000}}\\\Rightarrow x=0.3836\ m

The compression of spring = 0.5-0.3836 = 0.1164 m

b) Weight of the brick

F=5\times 9.81\\\Rightarrow F=49.05\ N

F=kx\\\Rightarrow x=\frac{F}{k}\\\Rightarrow x=\frac{49.05}{8000}\\\Rightarrow x=0.00613\ m

The final length of the spring = 0.5-0.00613 = 0.49387 m

4 0
3 years ago
a 20 kg projectile is launched from a cannon. a. if the projectile leaves the cannon with a velocity of 54 m/s, what is the work
Artyom0805 [142]

Answer:

KE = 1/2 M v^2       kinetic energy of projectile

KE = 1/2 * 20 * (54 m/s)^2 = work done on projectile

W = 10 * 54^2 = work done on projectile

W = 29,160 J

7 0
2 years ago
In which situation is the gravitational force between two objects hard to detect? (Options)
svlad2 [7]

A - the objects are too small

GRAVITATIONAL FORCE IS EXPERIENCED BY ALL OBJECTS IN THE UNIVERSE ALL THE TIME. BUT THE ORDINARY OBJECTS YOU SEE EVERY DAY HAVE MASSES SO SMALL THAT THEIR ATTRACTION TOWARD EACH OTHER IS HARD TO DETECT. -https://www.ftsd.org/cms/lib6/MT01001165/Centricity/ModuleInstance/630/CHAPTER_2_NOTES_FOR_EIGHTH_GRADE_PHYSICAL_SCIENCE.pdf

5 0
4 years ago
Read 2 more answers
A 1000-kg car moving at 10 m/s brakes to a stop in 5 s. the average braking force is
Marina86 [1]
To calcculate the braking force of the car moving, we use Newton's second law of motion which relates the acceleration and the force of an object moving. The force of an object moving is directly proportional to its acceleration and the proportionality constant is the mass of the object. It is expressed as:

Force = ma

Acceleration is the rate of change of the velocity of a moving object. We calculate acceleration from the velocity and the time given above.

a = (10 m/s) / 5 s = 2 m/s^2

So,
Force = ma
Force = 1000 kg ( 2 m/s^2 )
Force = 2000 kg m/s^2 or 2000 N
4 0
3 years ago
The most useful unit of measurement for measuring the thickness of a side of a lab beaker would be a(n)
andrew11 [14]
The answer is letter c

3 0
3 years ago
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