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aleksklad [387]

2 years ago

11

A conservative force on a particle moving along the x axis is given by F = (3x^2-2x)i. Which of the following is a potential tha

t is associated with this force?
A. (6x-2)i
B. (-6x+2)i
C. x^3-x^2+3
D. -x^3+x^2+3
E. No answer given above is correct.

1 answer:

ANTONII [103]2 years ago

5 0

pck u

report me if you can

$tex]\purple{\rule{45pt}{7pt}}\blue{\rule{45pt}{999999pt}}$

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An airplane in the earth’s magnetic field can develop a voltage between its wingtips.

Svetradugi [14.3K]

Answer:

$emf=0.125\ V$

According to the Fleming's Left left hand rule we have higher potential on the right edge of the wing.

Explanation:

Given:

velocity of plane, $v=250\ m.s^{-1}$

magnetic field, $B=5\times 10^{-5}\ T$

angle between velocity and magnetic field, $\theta=30^{\circ}$

span of the wing, $l=20\ m$

We know:

$emf=B.l.v\ sin\theta$

$emf=5\times 10^{-5}\times 20\times 250\times sin30^{\circ}$

$emf=0.125\ V$

According to the Fleming's Left left hand rule we have higher potential on the right edge of the wing.

7 0

3 years ago

A student pushes a 40-N block across the floor for a distance of 10 m. How much work was applied to move the block? A. 4 J B. 40

damaskus [11]

Now for this problem, what is given is a 40 Newtons which would represent the force to be applied to the object, and a distance of 10 meters after the application of the said force. When these two combine, work is done. The unit for work is Joules and this is what we are looking for. The formula to get Joules or for work would be the force applied to the object multiplied by the distance that it travelled after the application of the force. It looks like this

work = force x distance
Joules = Newtons x meter

so let us substitute the variables to their corresponding places

Joules = 40 N x 10 m
Joules = 400 J

So the answer to this question would be C. 400 J

7 0

3 years ago

Read 2 more answers

A child in danger of drowning in a river is being carried down-stream by a current that flows uniformly with a speed of 2.20 m/s

zmey [24]

Answer:

The angle is 65.6°.

Explanation:

Given that,

Speed = 2.20 m/s

Distance from the shore= 500 m

Distance from the bottom= 1100 m

Speed of boat = 7.30 m/s

According to figure,

We need to calculate the angle with shore

Using formula of angle

$\tan\theta=\dfrac{y}{x}$

Put the value into the formula

$\tan\theta=\dfrac{500}{1100}$

$\theta=\tan^{-1}(\dfrac{500}{1100})$

$\theta=24.4^{\circ}$

We need to calculate the angle

$\alpha=90-\theta$

Put the value into the formula

$\alpha=90-24.4$

$\alpha=65.6^{\circ}$

Hence, The angle is 65.6°.

5 0

3 years ago

A box at rest has the shape of a cube 3.5 m on a side. This box is loaded onto the flat floor of a spaceship and the spaceship t

guapka [62]

Answer:

$V_o=25.725\ m^3$

Explanation:

Given:

sides of the cube, $a=3.5\ m$

speed of the cube with respect to the observer, $v=0.8c$

Since the relative velocity of the object is relativistic, so there will be a length contraction according to the observer:

$a_o=a\div\frac{1}{\sqrt{1-\frac{v^2}{c^2} } }$

where:

$a_o=$ observed length of the side along the direction of velocity

$a_o=3.5\div\frac{1}{\sqrt{1-\frac{(0.8c)^2}{c^2} } }$

$a_o=2.1\ m$ is the observed length of the cube edge only in the direction of the velocity due to relativistic effect of length contraction.

So the observed volume will be:

$V_o=a\times a\times a_o$

$V_o=3.5\times 3.5\times 2.1$

$V_o=25.725\ m^3$

5 0

3 years ago

Put the following stages of star formation into the proper sequence from earliest to latest:

BaLLatris [955]

C → A → E → D → F → H → G → I → B

Explanation:

Put into the proper order, the following are the stages of star formation from earliest to latest:

Massive, rotating, amorphous interstellar cloud collapses and fragments → Infalling material forms a hot and luminous protostar at the center of the disk → Gravitational contraction causes protostar to shrink and heat as it descends the Hyashi track → As the shrinking protostar heats up, hydrogen is ionized and a magnetic field forms → Magnetic bipolar outflows begin along rotation axis as the magnetic field forms → As bipolar outflows become stronger, powerful T-Tauri winds start clearing the nebula before the onset of nuclear fusion → Shrinking cloud collapses into a flat disk shape → Onset of nuclear fusion in the core occurs around 15 million K → Newly-formed star settles onto the Main Sequence

5 0

3 years ago