3 years ago

Which of the following is the best thermal insulator?

Physics

1 answer:

sdas [7]3 years ago

7 0

Answer:

you're right it is b....

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Ecology is the study of

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Organisms and their environment

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3 years ago

Suppose that a 1000 kg car is traveling at 25 m/s (aprox 55mph). Its brakes can apply a force of 5000N. What is the minimum dist

Brrunno [24]

Assuming the the car is travelling to the right (→):

$R(\rightarrow), F = ma$

$\implies a = \frac{F}{m}$

$= \frac{-5000}{1000}$

$= -5 \ ms^{-2}$

The information we know:

$u = 25 \ ms^{-1}$

$v = 0$

$a = -5 \ ms^{-2}$

Using one of the equations of motion:

$v^2 = u^2 + 2as$

$\implies s = \frac{v^2 -u^2}{2a}$

$= \frac{0^2 - 25^2}{2\times (-5)}$

$= \frac{625}{10}$

$= 62.5\ m$

8 0

3 years ago

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A car with a mass 1200 kg accelerates at 1.89 m/s2. What is the total force exerted by the car on the road (answer in N to two d

Reptile [31]

Formula:
F = ma
F: force (N) m: mass (kg) a: acceleration (m/s^2)

Solution:
F = ma
F = 1200 × 1.89
= 2268N

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3 years ago

A 4.5 g coin sliding to the right at 23.8 cm/s makes an elastic head-on collision with a 13.5 g coin that is initially at rest.

Airida [17]

Answer:

a) $v = 11.9\times 10^{-2}\,\frac{m}{s} \,(11.9\,\frac{cm}{s} )$ , b) $\Delta K = 9.559\times 10^{-5}\,J$

Explanation:

a) The final velocity of the 13.5 g coin is found by the Principle of Momentum Conservation:

$(4.5\times 10^{-3}\,kg)\cdot (23.8\times 10^{-2}\,\frac{m}{s} )+(13.5\times 10^{-3}\,kg})\cdot (0\,\frac{m}{s} ) = (4.5\times 10^{-3}\,kg)\cdot (-11.9\times 10^{-2}\,\frac{m}{s} )+(13.5\times 10^{-3}\,kg})\cdot v$

The final velocity is:

$v = 11.9\times 10^{-2}\,\frac{m}{s} \,(11.9\,\frac{cm}{s} )$

b) The change in the kinetic energy of the 13.5 g coin is:

$\Delta K = \frac{1}{2}\cdot (13.5\times 10^{-3}\,kg)\cdot \left[(11.9\times 10^{-2}\,\frac{m}{s} )^{2}-(0\,\frac{m}{s} )^{2}\right]$

$\Delta K = 9.559\times 10^{-5}\,J$

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3 years ago

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Which correctly lists three main causes of deforestation?

ASHA 777 [7]

I think it’s A. Mining and logging are huge factors

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