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3 years ago

While camping in a tent on a cold night, which would keep you warmer for a longer period of time. a 10 kg

Physics

1 answer:

Masja [62]3 years ago

4 0

Answer:

a 10 kg bag of hot water at the same temperature

Explanation:

A 10kg bag of hot water at the same temperature will retain heat much better and keep the tent warmer at night compared to the iron pellet.

Water has a very large specific heat capacity.
The specific heat capacity of water allows for it to retain heat better.
It takes a larger amount of heat to warm water compared to iron which is a better conductor.
In like manner, it takes more time for water to lose that amount of heat it has gained by the heating process.
This is why it is a better choice to keep the room warm

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A periodic wave travels from one medium to another. which pair of variables are likely to change in the process?

Sav [38]

velocity and wavelength are likely to change in the process

When a wave travels from one medium to another it undergoes a change in direction and this is referred to as refraction.

Refraction is the bending of a wave or a change in direction of a wave as it travels from one medium to another. Refraction is accompanied by change in velocity and wavelength of a wave

brainly.com/question/12571787

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2 years ago

Microphones and loudspeakers are used in an auditorium because the sound waves at the stage compared to the sound waves at the b

MaRussiya [10]

Acoustics (sounds)
Hope the this helps!

6 0

3 years ago

The coefficients of friction between the 20-kg crate and the inclined surface are µ,8 = 0.24 and J.lk = 0.22. If the crate start

Yanka [14]

Answer:5.60 m/s

Explanation:

Given

Coefficient of static friction $\mu _s=0.24$

Coefficient of kinetic friction $\mu _k=0.22$

mass of crate $m=20\ kg$

Force applied $F=200\ N$

maximum static Friction $F_s=\mu _sN$

$N=mg$

$F_s=0.24\times 20\times 9.8$

$F_s=47.04\ N$

thus applied force is greater than Static friction therefore kinetic friction will come into play

$F_k=\mu _kN$

$F_k=0.22\times 20\times 9.8=43.12\ N$

net Force on crate $F-F_k=ma$

$a=\frac{200-43.12}{20}=7.84\ m/s^2$

Magnitude of velocity can be obtained by using

$v^2-u^2=2as$

where v=final velocity

u=initial velocity

a=acceleration

s=displacement

here initial velocity is zero as crate start from rest

$v^2-0=2\times 7.84\times 2$

$v=\sqrt{31.37}$

$v=5.60\ m/s$

7 0

4 years ago

A child pulls on a wagon with a horizontal force of 75 N. If the wagon moves horizontally a total of 42 m in 1.5.0 min, what is

d1i1m1o1n [39]

Answer:

B) 35 W

Explanation:

Force applied by child = 75 N = F

Distance travelled by child = 42 m = d

Time traveled for is 1.5 min = 1.5×60 = 90 seconds = t

Work done by the child

W = Fdcosθ

⇒W = 75×42cos0

⇒W = 3150 Joule

Power is defined as work done per unit time

$P=\frac{W}{t}\\\Rightarrow P=\frac{3150}{90}=35\ W$

∴ The average power generated by the child is 35 W

4 0

4 years ago

What does Kepler's second law state? A. Planets travel in ellipses. B. Planets sweep equal areas in equal times. C. A planet's a

andrey2020 [161]

Kepler's second law of planetary motion says that the imaginary line
from the Sun to the planet sweeps out equal areas in equal periods
of time.

It's just as true of comets, asteroids, dwarfs, coasting space probes ...
anything in the solar system that's coasting in gravity, and not firing engines.

That's why a comet moves so fast when it gets near the Sun.

4 0

3 years ago