3 years ago

PLEASE HELP!! 13 POINTS! SCIENCE!

Physics

2 answers:

Vsevolod [243]3 years ago

4 0

Answer:

it's only 7 points we have an eyessssss

pogonyaev3 years ago

3 0

Answer:

Explanation:

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We cannot see the milky way galaxy without binocular or telescopes. true or false?

DerKrebs [107]

Answer:

I'm pretty sure it's false

Explanation:

3 0

2 years ago

Electrons are in constant motion around the nucleus because of

TEA [102]

because of the continnuity of quaternion energy.

8 0

3 years ago

A Styrofoam box has a surface area of 0.73 m and a wall thickness of 2.0 cm. The temperature of the inner surface is 5.0°C, and

Elis [28]

Answer:

$K = 0.076 W/m K$

Explanation:

Heat required to melt the complete ice is given as

$Q = mL$

here we have

m = 5.0 kg

$L = 3.35 \times 10^5 J/kg$

now we have

$Q = (5 kg)(3.35 \times 10^5)$

$Q = 1.67 \times 10^6 J$

now the power required to melt ice in 8.4 hours is

$P = \frac{Q}{t} = \frac{1.67\times 10^6}{8.4 \times 3600 s}$

$P = 55.4 Watt$

now by formula of conduction we know

$P = \frac{KA(\Delta T)}{x}$

now we have

$55.4 = \frac{K(0.73 m^2)(25 - 5)}{0.02}$

$K = 0.076 W/m K$

5 0

3 years ago

The mass of the Sun is 2x1030 kg, and the mass of Mars is 6.4x1023 kg. The distance from the Sun to Mars is 2.3X1011 m. Calculat

user100 [1]

Answer: force from sun to mars = $1.62*10^{19} N$ , force from mars to sun = $-1.62*10^{19} N$

Explanation: The force of attraction or repulsion between 2 object ( in this case the sun and mars ) in space is given by newton's law of gravitation which is given mathematically below as

$F =\frac{Gm_{s} m_{m} }{r^{2} }$

where $G = 6.67 * 10^{-11} , m_{s} = 2*10^{30}kg m_{m} = 6.4 *10^{23} kg\\r = 2.3 *10^{11} m$

G = gravitational constant, $m_{m}$ = mass of mars, $m_{s}$ = mass of sun

$F = \frac{6.64 * 10 ^{-11}* 2 * 10^{30} *6.4*10^{23}} {2.3*10^{11} * 2.3* 10^{11} } =\frac{85.376 *10^{42} }{5.25 *10^{22} } \\\\F = 1.62 * 10 ^{19} N\\$

the mars also exerts the same magnitude of force above on the sun but in the opposite direction, thus the force mars exerts on the sun is $-1.62*10^{19} N$

8 0

2 years ago

When two or more simple machines work together, they are called a(n) ____.

Dmitry_Shevchenko [17]

A.compound machine; because it's two simple machines compounded together.

7 0

2 years ago