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3 years ago

Can velocity of an object be negative when it’s acceleration is positive?

Physics

2 answers:

Bad White [126]3 years ago

6 0

Answer:

Yes

Explanation:

When a bike is coming to a stop the velocity is negative while the acceleration is positive.

Margaret [11]3 years ago

5 0

Answer
Yes
Example
When a car is coming to rest by braking the acceleration will be negative and the velocity will be positive.

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Jon had a flat tire on his car. He used a hydraulic jack to lift the car up so that he could change the tire. II

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The acceleration of lifting the car .25 meters off the ground

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4 years ago

A cylinder with a moveable piston contains 92g of Nitrogen. The external pressure is constant at 1.00 atm. The initial temperatu

nikitadnepr [17]

Answer:

$W = 3542.7 J$

Explanation:

As per ideal gas law we know that

PV = nRT

so we have

$P = 1.01 \times 10^5 Pa$

$n = \frac{92}{28} = 3.28 moles$

T = 200 K

now we have

$(1.01 \times 10^5) V = 3.28 (8.31)(200)$

$V_1 = 0.054 m^3$

Now we know that if pressure remains constant

$\frac{V_1}{T_1} = \frac{V_2}{T_2}$

$\frac{0.054}{200} = \frac{V_2}{70}$

$V_2 = 0.0189 m^3$

Now work done in this process is given as

$W = P \Delta V$

$W = (1.01 \times 10^5)(0.054 - 0.0189)$

$W = 3542.7 J$

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3 years ago

Uranium mining is not very disruptive of the land, and therefore nuclear power is much more desirable than coal mining. TRUE FAL

erik [133]

The answer to your question is True.
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4 years ago

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Two long, parallel wires are attracted to each other by a force per unit length of 305 µN/m. One wire carries a current of 25.0

kykrilka [37]

To solve this problem we will use the concepts related to the electromagnetic force related to the bases founded by Coulumb, the mathematical expression is the following as a function of force per unit area:

$\frac{F}{L} = \frac{kl_1l_2}{d}$

Here,

F = Force

L = Length

k = Coulomb constant

I =Each current

d = Distance

Force of the wire one which is located along the line y to 0.47m is $305*10^{-6}N/m$ then we have

$l_2 = \frac{F}{L} (\frac{d}{kl_1})$

$l_2 = (305*10^{-6}N/m)(\frac{0.470m}{(2*10^{-7})(25A))})$

$l_2 = 28.67A$

Considering the B is zero at

$y = y_1$

$\frac{kI_2}{2\pi y} =\frac{kI_1}{2\pi y_1}$

$\frac{(4\pi*10^{-7})(28.67)}{2\pi (y_1)} = \frac{(4\pi *10^{-7})(25)}{2\pi (0.47-y_1)}$

$y_1 = 0.25m$

Therefore the value of y for the line in the plane of the two wires along which the total B is zero is 0.25m

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4 years ago

9) If a wave has a speed of 362 m/s and a period of 4.17 s, what is its wavelength?

kakasveta [241]

Answer:

Option B (1.51 m)

Explanation:

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2 years ago

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