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3 years ago

Which of the following best defines insulator?

Physics

1 answer:

Leya [2.2K]3 years ago

6 0

Answer:a substance with low ability or no ability to conduct energy

Explanation:

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Which of the following statements is an accurate description of sound transmission through various mediums? A. Gases conduct sou

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C. Sound insulators prevent sound from being transmitted better than elastic solids

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3 years ago

Positronium is an atom composed of an electron and a positron (mp = me, Q = +e). Calculate the distance between the particles an

Virty [35]

Answer:

-6.8ev

Explanation:

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3 years ago

Gamma rays can cause cancer, but they can also be used to treat cancer. How

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Answer:

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2 years ago

While standing on an open bed of a truck moving at 35 m/s, an archer sees a duck flying directly overhead. The archer shoots an

pashok25 [27]

Answer:

Part a)

$t = 20 s$

Part b)

$x = 700 m$

Part c)

Since horizontal speed of truck and the arrow is same so the arrow will strike at the position of the archer as they both moving with same speed

Explanation:

Part a)

As we know that the arrow moves with uniform acceleration in vertical direction so we can use kinematics in Y direction

Here we know that

$\Delta y = v_y t + \frac{1}{2}at^2$

since the arrow lands at the same height so its vertical displacement of whole motion is zero

so we will have

$0 = 98 t - \frac{1}{2}(9.8) t^2$

$0 = 98 t - 4.9 t^2$

$t = 20 s$

Part b)

Horizontal distance moved by the arrow

$x = v_x t$

here horizontal speed of arrow is same as that of speed of truck

so we will have

$x = 35 \times 20$

$x = 700 m$

Part c)

Since horizontal speed of truck and the arrow is same so the arrow will strike at the position of the archer as they both moving with same speed

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3 years ago

Galileo Galilei was the first scientist to perform experiments in order to test his ideas. He was also the first astronomer to s

arsen [322]

Explanation:

Geocentric model said that the Earth is at the center of the universe and everything revolves around it. It was considered to be stationary. Galileo proved this model incorrect with the help of his astronomical observations. Some of the key observation that he used to support the heliocentric model were:

1. He proposed the theory that the tides on the Earth occur because of its motion.

2. He observed the phases of the Venus which meant that the Venus revolved around the Sun and not the Earth.

3. He observed other planets and thus noted that they also move around the Sun and not Earth.

4. He discovered the Moons of other planets.

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3 years ago