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2 years ago

What is the acceleration of a car that goes from 40 m/s to 80 m/s in 2s?

Physics

1 answer:

Law Incorporation [45]2 years ago

3 0

Answer:

Explanation:

pls brainlyest i need it

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In a Hydrogen atom an electron rotates around a stationary proton in a circular orbit with an approximate radius of r =0.053nm.

VLD [36.1K]

Answer:

(a) 8.2 x 10^-8 N

(b) 3.6 x 10^-47 N , 2.27 x 10^39

Explanation:

charge of proton, q1 = 1.6 x 10^-19 C

charge of electron, q2 = - 1.6 x 10^-19 C

radius of orbit, r = 0.053 nm = 0.053 x 10^-9 m

mass of electron, me = 9.1 x 10^-31 kg

mass of proton, mp = 1.67 x 10^-27 kg

Gravitational constant, G = 6.67 x 10^-11 Nm^2/kg^2

(a) The electrostatic force between two charges is given by

$F_{e}=\frac{Kq_{1}q_{2}}{r^2}$

Where, K is the coulombic constant = 9 x 10^9 Nm^2/C^2

By substituting the values

$F_{e}=\frac{9\times 10^{9}\times 1.6\times 10^{-19}\1.6\times 10^{-19}}{\left ( 0.053 \times 10^{-9} \right )^2}$

Fe = 8.2 x 10^-8 N

(b) The gravitational force between the electron and proton is given by

$F_{g}=\frac{Gm_{e}m_{p}}{r^{2}}$

$F_{g}=\frac{6.67\times 10^{-11}\times 9.1\times 10^{-31}\1.67\times 10^{-27}}{\left ( 0.053 \times 10^{-9} \right )^2}$

Fg = 3.6 x 10^-47 N

$\frac{F_{e}}{F_{g}}=\frac{8.2\times10^{-8}}{3.6\times 10^{-47}}$

$\frac{F_{e}}{F_{g}}=2.27\times 10^{39}$

5 0

3 years ago

A pressure is applied to 2L of water. The volume is observed to decrease to 18.7 L. Calculate the applied pressure.

lakkis [162]

Answer:

Applied pressure is 1.08 10⁵ Pa

Explanation:

This exercise is a direct application of Boyle's law, which is the application of the state equation for the case of constant temperature.

PV = nR T

If T is constant, we write the expression for any two points

Po Vo = p1V1

From the statement the initial pressure is the atmospheric pressure 1.01 10⁵ Pa, so we clear and calculate

1 Pa = 1 N / m2

P1 = Po Vo / V1

P1 = 1.01 10⁵ 20/18.7

P1 = 1.08 10⁵ Pa

4 0

3 years ago

Lava is rock that has undergone a physical change and has liquefied. What is known about this change?

RideAnS [48]

It was super heated to turn in to a liquid

3 0

3 years ago

Why not two magnetic field lines can intersect? why not it is possible?

11111nata11111 [884]

At each point on a 'line', the direction of the 'line' is the direction of the force
on a small test magnet placed in the field at that point.

If two 'lines' crossed at the same point, that means a small test magnet placed
at that point in the field would feel a force in two different directions.

But even if that were true, then the net effect on the small test magnet would be
the vector sum of the two forces, and they would be represented by a single net
force anyway, and therefore by a single field 'line' at that point.

4 0

4 years ago

What is the formula for newton's third law of motion

dem82 [27]

Answer:

The third law states that all forces between two objects exist in equal magnitude and opposite direction: if one object A exerts a force FA on a second object B, then B simultaneously exerts a force FB on A, and the two forces are equal in magnitude and opposite in direction: FA = −FB.

Explanation:

You can literally google this. It would have been faster.

8 0

3 years ago

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