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3 years ago

6

NEED HELP ASAP ONLY HAVE 1 MINUTE !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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A ------ and a-------- are examples of inclined planes.
CHOICES FOR FIRST BLANK: lever and wedge
CHOICE FOR SECOND BLANK:Pulley and screw

1 answer:

matrenka [14]3 years ago

5 0

My guess is <u><em>Wedge & Pulley</em></u>

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The normal is an imaginary line that is ____ to a surface

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The normal is an imaginary line at right angles to the plane mirror. Smooth surfaces produce strong echoes when sound waves hit them, and they can act as mirrors when light waves hit them. The waves are reflected uniformly and light can form images.

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3 years ago

Study the motion map shown. what do the circled vectors represent?

BabaBlast [244]

Answer:

It's option d - Negative acceleration

Explanation:

Let's start by demonstrate why <em>it's not option b - Speed : </em>Speed is a scalar quantity so it can not be represented by a vector

Let's check that <em>the green vectors represent velocity</em> (velocity is a vector quantity, velocity is a direction aware, while speed is just a scalar)

Now let's show that the circled vectors are acceleration vectors:

Mathematically position X , velocity V and acceleration A are:

$\frac{dX}{dt} = V$ and $\frac{dV}{dt} = A$

Where X, V, A are vectors and $\frac{d(a)}{dt} = b$ indicates the derivate a of a time is equal to b.

So, this show that acceleration is a rate respect of time of velocity ⇒ When acceleration is positive, velocity increments, when acceleration is negative, velocity decrements.

<em>The above explanation correspond to the motion map shown, getting demonstrated that the answer is D - Negative acceleration </em>

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3 years ago

How could you decrease the total energy of a system consisting of a jar full of water? O A. Heat the jar in a microwave oven. O

Vaselesa [24]

Answer:

A

Explanation:

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3 years ago

Read 2 more answers

(a) Circular metal wires in electrical circuits may have different cross-sectional areas (different diameters) and different len

WARRIOR [948]

For the different wires the values given are

For Wire A, Area= $A_{A}$ , Resistivity= $ρ_{A}$ , Length= $L_{A}$ , Heat= $H_{A}$ , Voltage= V, Time= t, Wire B, Area= $A_{B}$ , Resistivity= $ρ_{B}$ , Length= $L_{B}$ , Heat= $H_{B}$

So, $H_{A}$ / $H_{A}$ = $\frac{V^{2} *t}{\frac{ρ(1)*L_{A} }{A_{A} } }$ / $\frac{V^{2} *t}{\frac{ρ(2)*L_{B} }{A_{B} } }$

Therefore $H_{A}$ / $H_{A}$ = $\frac{A_{A}*ρ_{B} *L_{B}}{A_{B}ρ_{A} L_{A} }$

<h3>Heat</h3>

The type of energy that moves between two materials with varying temperatures is referred to by scientists as heat. Because the average translational kinetic energy per molecule in the two materials varies, an energy transfer takes place. Up until thermal equilibrium is attained, heat is transferred from the substance with the higher temperature to the material with the lower temperature. The joule, with 1 joule equalling 1 newton meter, is the SI unit of heat. Imagine the following situation to better comprehend what happens when this energy transfer takes place: Tiny rubber balls are bouncing all over two distinct containers that are full with them. The difference between the average ball speed in one container and the second container is substantial.

(a) Circular metal wires in electrical circuits may have different cross-sectional areas (different diameters) and different lengths. For a given applied voltage, how would the joule heat vary with these parameters

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2 years ago

john throws .4 kg ball with velocity of 18 m/s. Hits .2 kg bottle and bottle flies 25 m/s. How fast is ball traveling after hitt

UNO [17]

Answer:

5.5 m/s

Explanation:

Assuming the bottle is initially stationary, we can write the law of conservation of momentum as follows:

$p_i = p_f\\m_b u_b = m_b v_b + m_B v_B$

where

$m_b = 0.4 kg$ is the mass of the ball

$u_b = 18 m/s$ is the initial velocity of the ball

$m_B = 0.2 kg$ is the mass of the bottle

$v_B = 25 m/s$ is the final velocity of the bottle

$v_b$ is the final velocity of the ball

Solving for $v_b$ ,

$v_b = \frac{m_b u_b - m_B v_B}{m_b}=\frac{(0.4 kg)(18 m/s)-(0.2 kg)(25 m/s)}{0.4 kg}=5.5 m/s$

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3 years ago