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4 years ago

A negative velocity, approaching zero, represents a negative acceleration. True or False

Physics

1 answer:

ruslelena [56]4 years ago

8 0

Answer:

False.

Explanation:

Lets assume our positive direction to the right (this reasoning works for any direction). A negative velocity would then be then directed to the left. If it varies as such that it aproaches to zero, it means that the variation is directed to the right, and that is where the direction of the acceleration must be pointing. In other words, its losing its velocity, so the acceleration must point opposite to the velocity. Then it means the acceleration is positive.

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An object falls through the air, gaining speed as it falls. A student claims that this creates new energy, and so it breaks the

yKpoI14uk [10]

Answer:

Explanation:

Energy is never created nor destroyed.

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4 years ago

Read 2 more answers

Diamond has a high index of refraction at about 2.4, which helps account for its sparkle. How fast does light travel through a d

wariber [46]

Answer:

$1.25 \cdot 10^8 m/s$

Explanation:

The speed of light through a medium is given by:

$v=\frac{c}{n}$

where

$c = 3 \cdot 10^8 m/s$ is the speed of light through vacuum

n is the index of refraction of the material

In this case, diamond has a refractive index of n = 2.4, so the speed of light in diamond is

$v=\frac{3\cdot 10^8 m/s}{2.4}=1.25\cdot 10^8 m/s$

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3 years ago

Please help on this physics question?

Anton [14]

W=F*d

W=-60N*5m=-300J

So friction does -300J of work on the box

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3 years ago

You raise a bucket of water from the bottom of a well that is 12 m deep. the mass of the bucket and the water is 5.00 kg, and it

MArishka [77]

Given: Mass m = 5.00 Kg; Height h = 12 m; Time t = 15 s

Required: Power P = ?

Formula: P = Fd/t = mgh/t

P = (5.0 Kg)(9.8 m/s²)(12 m)/15 s

P = 39.2 Kg.m²/s² or

P = 39.2 J

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3 years ago

In the same configuration of the previous problem 3, four long straight wires are perpendicular to the page, and their cross sec

faust18 [17]

Complete Question:

In the same configuration of the previous problem 3, four long straight wires are perpendicular to the page, and their cross sections form a square of edge length a = 13.5 cm. Each wire carries 7.50 A, and the currents are out of the page in wires 1 and 4 and into the page in wires 2 and 3.

a) Draw a diagram in a (x,y) plane of the four wires with wire 4 perpendicular to the origin. Indicate the current's directions.

b) Draw a diagram of all magnetic fields produced at the position of wire 3 by the other three currents.

c) Draw a diagram of all magnetic forces produced at the position of wire 3 by the other three currents.

d) What are magnitude and direction of the net magnetic force per meter of wire length on wire 3?

Answer:

force, 1.318 ₓ 10⁻⁴

direction, 18.435°

Explanation:

The attached file gives a breakdown step by step solution to the questions

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3 years ago