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3 years ago

Why was the geocentric model of the solar system accepted by scientist for many years?

Physics

1 answer:

dolphi86 [110]3 years ago

6 0

Answer: Because of the its assumption of earth being at the centre of the universe and also, its parallax argument.

Explanation: Geocentric model is the

theory of the structure of the solar system (or the universe) in which Earth is assumed to be at the centre of it all. It was generally accepted until the 16th century, after which it was superseded by heliocentric models

Among many, geocentric model was considered because of its stellar parallax argument.

What is parallax? Parallax is the apparent change in position of objects due to a change in observation location

The ancient Greeks claimed that if the Earth is moving around the Sun then the stars should shift their positions due to this orbital motion (called stellar parallax). The stars don't shift. They don't shift enough for you to notice, but they do indeed shift. This is essentially the same reason the moon appears to follow you around when you drive - it's too far away for any apparent shift due to your motion.

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At the bottom of a frictionless ramp, a 2kg mass reaches a speed of 9 m/s, how high is the top of the ramp? *

noname [10]

V=√(2gs)
9=√(2×9.8×s)
s=4.1m

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3 years ago

what is the magnitude of the compression forces (assumed to be horizontal) acting on both sides of the center board that is sand

Len [333]

F = normal force by each board on each side

W = weight of the board in between acting in down direction = 95.5 N

f = frictional force in upward direction by each board

$\mu$ = coefficient of friction = 0.663

Using equilibrium of force in Upward direction

f + f = W

f = W/2

f = 95.5/2 = 47.75 N

frictional force is given as

f = $\mu$ F

47.75 = (0.663) F

F = 72.02 N

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3 years ago

A steel drill making 180 rpm is used to drill a hole in a block of steel. The mass of the steel block and the drill is 180 g. If

SVETLANKA909090 [29]

Answer:

a) 37.8 W

b) 2 Nm

Explanation:

180 g = 0.18 kg

We can also convert 180 revolution per minute to standard angular velocity unit knowing that each revolution is 2π and 1 minute equals to 60 seconds

180 rpm = 180*2π/60 = 18.85 rad/s

We can use the heat specific equation to find the rate of heat exchange of the steel drill and block:

$\dot{E} = mc\Delta \dot{t} = 0.18*420*0.5 = 37.8 J/s$

Since the entire mechanical work is used up in producing heat, we can conclude that the rate of work is also 37.8 J/s, or 37.8 W

The torque T required to drill can be calculated using the work equation

$E = T\theta$

$\dot{E} = T\dot{\theta} = T\omega$

$T = \frac{\dot{E}}{\omega} = \frac{37.8}{18.85} = 2 Nm$

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3 years ago

4. How much energy must be absorbed by water with a mass of 0.5 kg in order to raise the temperature from 30°C to

Mandarinka [93]

Answer:

Q = 73325 J or 73.325 KJ

Explanation:

Given the following data;

Specific heat capacity of water = 4190

Mass = 0.5kg

dt = 65 - 30 = 35°C

Heat capacity is given by the formula;

Q = mcdt

Where,

Q represents the heat capacity.

m represents the mass of an object.

c represents the specific heat capacity of water.

dt represents the change in temperature.

Substituting into the equation, we have:

Q = 0.5 * 4190 * 35

Q = 73325 Joules.

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3 years ago

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Wittaler [7]

As you go from Radio waves across to Gamma eats : Wavelength decreases and frequency and energy increase.

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