Which of the following would be the best insulator? air aluminum copper silver

Physics

1 answer:

77julia77 [94]2 years ago

4 0

Answer:

aluminum will be the best insulator...coz it have a high resistance

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Any projectile always has a constant vertical acceleration of _______.

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Answer:

The answer to your question is: C. -9.81 m/s²

Explanation:

A. 9.81 m/s² acceleration is considered positive when it goes to the center of the earth, so this option is incorrect.

B. 0 m/s² This option is incorrect because acceleration is 0 for a linear motion without acceleration.

C. -9.81 m/s² If a projectile goes to the sky, then the acceleration will be negative.

D. It is not constant. Acceleration is constant.

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3 years ago

Review 1: A plane is located x = 40 miles (horizontally) away from an airport at an altitude of h miles. Radar at the airport de

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Explanation:

Let h is the height of the plane above ground. x is the horizontal distance between the ground and the airport. Let s(t) is the distance between the plane and the airport. So,

$s(t)^2={h^2+x^2}$ ...........(1)

Given, h = 4, x = 40 and s(t) = -20 mph

Differentiate equation (1) wrt t

$2s(t)s'(t)=2x(t)x'(t)$

$x'(t)=\dfrac{s(t)s'(t)}{x(t)}$

When x = 40, $s(t)=\sqrt{40^2+4^2}=40.19\ m$

$x'(t)=\dfrac{-240s(t)}{x(t)}$

$x'(t)=\dfrac{-240\times 40.19}{40}$

$x'(t)=-241.14\ m/s$

So, the speed of the airplane is 241.14 m/s. Hence, this is the required solution.

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Oxygen and nutrients are moved through the body by the: a. circulatory system c. lymphatic system b. digestive system d. reprodu

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A. The Circulatory System.

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In a simple machine, the energy input is 120 J. If the efficiency of the machine is 80%, calculate the energy output

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Answer:

<h2>96 Joules</h2>

Explanation:

We know that efficiency is the ratio of output power by input power. i.e. Efficiency describes the quality of machine or system how good it is.