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3 years ago

11. An object moves in circular path with constant speed

Physics

1 answer:

Temka [501]3 years ago

6 0

Answer:

B. Is its acceleration constant

Explanation:

Uniform circular motion can be described as the motion of an object in a circle at a constant speed. As an object moves in a circle, it is constantly changing its direction. ... An object undergoing uniform circular motion is moving with a constant speed. Nonetheless, it is accelerating due to its change in direction.

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A particle on the x-axis is moving to the right at 2 units per second. At a certain instant it is at the point (5,0). How rapidl

koban [17]

Answer:

dr/dt = 1.94 units per second

Explanation:

A particle is moving on the x-axis to the right at 2 u/s.

To know how is changing the distance of the particle respect to the point (0,9), on the y-axis, you first take into account that the distance between charge and a point over the y-axis is given by:

$r^2=x^2+y^2$ (1)

Next, you calculate implicitly the derivative of the equation (1) respect to t:

$\frac{d}{dt}r^2=\frac{d}{dt}[x^2+y^2]\\\\2r\frac{dr}{dt}=2x\frac{dx}{dt}+2y\frac{dy}{dt}$ (2)

Next, you solve the previous equation for dr/dx:

$\frac{dr}{dt}=\frac{x(dx/dt)+y(dy/dt)}{\sqrt{x^2+y^2}}$ (3)

dx/dt: the speed of the particle on the x-axis = 2

dy/dt: speed of the particle on the y-axis = 0

For the instant given in the statement, you have that:

x = 5

y = 9

Then, you replace the values for x, y, dx/dt and dy/dt in the equation (3):

$\frac{dr}{dt}=\frac{2(5)(2)+0}{\sqrt{(5)^2+(9)^2}}=1.94$

The speed of change of the distance between particle and point (0,9) is 1.94 units per second

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3 years ago

To measure one wavelength, you would measure the distance between ______

laila [671]

Answer:

the distance between two nearest peaks

Explanation:

hope this helps :)

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4 years ago

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Which material is likely to slow the flow of electric charges the most ? explain.

alekssr [168]

Metal as it is a conductor of electricity

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3 years ago

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Do tectonic plates cover most of earth but not all of it?

Nikolay [14]

Yes,tectonic plates are only the outermost shell of the Earth and not all of it

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4 years ago

The emf of the battery is 1.5 V. In Nichrome there are 9 × 1028 mobile electrons per m3, and the mobility of mobile electrons is

kolezko [41]

Answer:

The number of electrons entering the thin wire every second is 1.75 x 10⁻³ mobile electrons / second

Explanation:

Given;

emf of the battery, V = 1.5 V

electron density, = 9 × 10²⁸ mobile electrons per m³

mobility of electron, u = 7 × 10⁻⁵ (m/s)/(N/C)

length of thin wire, L = 6 cm = 0.06 m

cross sectional area of the thin wire, A = 1.3 x 10⁻⁸ m²

The magnitude of the electric ﬁeld in the thin wire is given by;

E = V/L

E = (1.5) / (0.06)

E = 25 N/C

the number of electrons entering the thin wire every second is given by;

$e/s = mobility \ x \ Electric \ field\\\\number \ of \ electrons \ per \ second =\frac{7*10^{-5} (m/s)}{N/C} *25 (N/C)\\\\number \ of \ electrons \ per \ second = 1.75*10^{-3} \ m/s$

Therefore, the number of electrons entering the thin wire every second is 1.75 x 10⁻³ mobile electrons / second

5 0

3 years ago