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3 years ago

You may have noticed that there was a big difference in the results of

Physics

1 answer:

vodomira [7]3 years ago

8 0

Answer:

For conduction you don't need position. For convection you do.

Explanation:

you just needed to look it up LOL <3

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A capacitor with initial charge q0 is discharged through a resistor. What multiple of the time constant τ gives the time the cap

fiasKO [112]

Answer: a) 0.13*τ ; b) 2.08*τ

Explanation: In order to explain the discharg of a capacitor through a resistor, we have to consider the following:

Q(t)=Qo* exp(-t/τ) for a lose of 1/8-th of its charge

in this case, Q(t)=7/8*Qo=7/8*exp(-t/τ)

ln(7/8)*τ=-t

then, t= -ln(7/8)*τ =0.13

For a lose of 7/8 th of its charge , we have

Q(t)=1/7*Qo*exp(-t/τ)

t=-ln(1/8)*τ=2.08

5 0

4 years ago

State how the centripetal force is provided in the following

konstantin123 [22]

Answer:

a) a planet orbiting the Sun,

Explanation:

As the word centripetal force means the movement of the body towards the centers around to which it's moving. The force of gravity of the sun, moon, and sun all celestial objects enable them to attract other celestial bodies.

The bigger is the mass the bigger will force of attraction. Like the other planets in the solar system, the earth is also attracted to the sun and revolves around in its defined orbit in an elliptical path.

4 0

3 years ago

The same mass, with a new string, is whirled in a vertical circle of the same radius about a fixed point. Find the magnitude of

Masteriza [31]

Answer:

256.3 N

Explanation:

Throughout the motion of the mass in the circular motion, the resultant of the Tension in the string and the weight of the body gives the net force (centripetal force) that is responsible for the acceleration of the mass in a circular motion.

At the top of the vertical circle of the motion of the mass, the tension is directed downwards towards the centre of the circle and the weight also is directed downwards towards the earth.

Net force = ma = T + W

ma = T + mg

But a = (v²/r) for circular motion,

(mv²)/r = T + mg

m = 2.31 kg

v = 7.77 m/s

r = 0.500 m

g = acceleration due to gravity = 9.8 m/s²

(2.31×7.77²)/0.5 = T + (2.31×9.8)

278.923 = T + 22.638

T = 278.923 - 22.638

T = 256.285 N = 256.3 N

Hope this Helps!!!

7 0

3 years ago

A 10 kg block is pulled across a horizontal surface by a rope that is oriented at 60° relative to the horizontal surface. What i

leva [86]

Answer:

145.6 J work is done by the tension.

Explanation:

Given:

Mass of the block (m) = 10 kg

Displacement of the block (d) = 10 m

Coefficient of kinetic friction (μ) = 0.2

Angle between the tension force and the displacement (x) = 60°

The block is moving with a constant velocity.

We know that, if a body moves with a constant velocity, then the acceleration of the body is zero as acceleration is the rate of change of velocity.

Now, from Newton's second law, the net force acting on a body is directly proportional to its acceleration. So, if acceleration of the block is zero, then the net force acting on the block is also zero.

Here, the forces acting on the block along the direction of motion of block are:

Component of tension force in the direction of displacement.
Frictional force in the direction opposite to displacement.

Now, as the net force is zero, both the forces stated above must be equal in magnitude.

Therefore, the tension component in the direction of displacement is given as:

$T_x=T\cos x$

Where, 'T' is the tension in the rope.

$T_x=T\times 0.5=0.5T----(1)$

Now, consider the vertical direction. There is no motion in the vertical direction. So, net force is zero or net upward force is equal to net downward force. This gives,

$T_y+N=mg\\\\T\sin x+N=mg\\\\N=mg-T\sin x\\\\N=10\times 9.8-T\sin 60^\circ\\\\N=98-\frac{\sqrt3T}{2}-------(2)$