A ramp makes pulling a cart up a hill easier. Less force is needed to pull the cart up alonger hill. How can you tell if this is mechanical efficiency?

Answers

Answer 1

Answer: The correct answer is that the longer the hill, the larger the output force. If a ramp makes pulling a cart up a hill easier, that is because it has less force needed to pull the cart up along the hill. It is mechanical efficient simply because the longer the hill, the larger the output force being exerted.

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A light ray traveling in air enters a secondmedium and its speed slows to 1.71 × 10^8 metersper second. What is the absolute index ofrefraction of the second medium?(1) 1.00 (3) 1.75(2) 0.570 (4) 1.94

The ozone layer _____. is part of the troposphere
is used to send radio signals
protects the earth from UV radiation
is made of charged ions and free electrons

Answers

Protects the earth from UV radiation.

The index of refraction for red light in material X is measured at 1.80. Blue light travels 5 × 10⁶ m/s slower than red light in this material. What is the index of refraction for blue light in material X?

Answers

The refractive index (n) of a material is defined as the ratio of the speed of light in a vacuum © to the speed of light in that material (v). Therefore, we can calculate the speed of light in material X for red light as v_red = c / n_red = c / 1.80. Similarly, the speed of light in material X for blue light can be calculated as v_blue = c / n_blue, where n_blue is the refractive index for blue light in material X.

We are given that blue light travels 5 × 10⁶ m/s slower than red light in this material. Therefore, we can write:

v_blue = v_red - 5 × 10⁶ m/s

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Substituting the expressions for v_red and v_blue, we get:

c / n_blue = c / 1.80 - 5 × 10⁶ m/s

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Solving for n_blue, we get:

n_blue = c / (c / 1.80 - 5 × 10⁶ m/s) ≈ 1.81

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Therefore, the refractive index for blue light in material X is approximately 1.81 123.

The large blade of a helicopter is rotating in a horizontal circle. The length of the blade is 6.58 m, measured from its tip to the center of the circle. Find the ratio of the centripetal acceleration at the end of the blade to that which exists at a point located 4.78 m from the center of the circle.

Answers

Answer:1.37

Explanation:

Given

Length of Blade $L=6.58 m$

Let blades be rotating at an angular velocity of $\omega$

centripetal acceleration at any radial distance r is given by

$a_c=\omega ^2\cdot r$

at $r=6.58$

$a_c_1=\omega ^2\cdot 6.58$

at $r=4.78 m$

$a_c_2=\omega ^2\cdot 4.78$

thus $(a_c_2)/(a_c_1)=(\omega ^2\cdot 4.78)/(\omega ^2\cdot 6.58)$

$(a_c_2)/(a_c_1)=0.72$

$(a_c_1)/(a_c_2)=1.37$

Final answer:

Centripetal acceleration depends inversely on the radius. The ratio of the centripetal accelerations at the end of the blade and at 4.78m from the center is approximately 0.73.

Explanation:

The centripetal acceleration of an object moving in a circle of radius r is given by the formula ac = v²/r, where v is the tangential velocity of the object. In this scenario, the velocity at both points on the blade is the same, as the blade is rotating as a whole.

Therefore, the centripetal acceleration on the blade at any point is inversely proportional to the radius from the center of the circle to that point.

So, the ratio of the centripetal acceleration at the end of the blade (6.58 m from the center) to the centripetal acceleration at a point located 4.78 m from the center, is the inverse ratio of their distances from the center. Therefore, the ratio is 4.78/6.58 which approximately equals 0.73.

Learn more about Centripetal Acceleration here:

brainly.com/question/14465119

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Which of the following statements about ice melting is true and why?A. Energy flows from the ice to its surroundings.
B. Water molecules move from their fixed position.
C. Water molecules lose energy.
D. The temperature of the ice increases as it melts.

Answers

The answer for this question is part B that is Water molecules move from their fixed position.

This is because when water is freeze it is in a solid condition that means the molecules are held together tightly and are are vibrating in their fixed positions.

As soon as the molecules gain energy they start to move around from their fixed positions and turn into a liquid.

In the process of doing so ice melts and becomes water.

option(D) is true
the ice molecules are taking in heat from its surroundings to melt and form water.This increases the temperature of ice as it melts.
option(c) can also be true because to form water,the intermolecular force between the molecules gets weak which allows them to move from their fixed point.

Brownian motion cannot be detected in colloids. True or false?

Answers

Brownianmotion is the random movement of colloidal particles suspended in a fluid. It iscaused by random collisions of the molecules in the fluid medium. The particlesin the solution or colloids are in constant random movement. A colloid hasproperties boundary to a homogenous and heterogeneous mixture. However inBrownian movement, the larger the size of a particle, the lesser its motion andthe smaller the size of the particle, the higher is motion. Colloids in generalhave larger particle size and therefore it Brownian motion is sluggish. The statementis false.

A chlorine ion contains 17 protons, 18 neutrons, and 18 electrons. What is the net charge of the ion? A. -e B. 0 C. +e D. -18e

Answers

A chlorine ion contains 17 protons and 18 electrons, which gives it a net charge of -1 1234. Therefore, the correct answer is A. -e.

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