PHYSICS HIGH SCHOOL

What is the minimum coeffecient of static friction μmin required between the ladder and the ground so that the ladder does not slip?

Answers

Answer 1

Answer:

Answer:

$\mu = (1)/(2tan\theta)$

Explanation:

let the ladder is of mass "m" and standing at an angle with the ground

So here by horizontal force balance we will have

$\mu N_1 = N_2$

by vertical force balance we have

$N_1 = mg$

now by torque balance about contact point on ground we will have

$mg((L)/(2)cos\theta) = N_2(L sin\theta)$

so we will have

$N_2 = (mg)/(2tan\theta)$

now from first equation we have

$\mu (mg) = (mg)/(2tan\theta)$

$\mu = (1)/(2tan\theta)$

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Which of these attributes is generally attributed to KeplerA).The Orbit of Mars is an Ellipse
B).The Earth is Round
C).Force of Gravity Between 2 objects Decreases with Distance
D).Planets Move in circles

Answers

Kepler's first "law":
The orbits of the planets are ellipses, with the sun at one focus.
This would include Mars.

Electromagnetic waves can travel through empty space true or false

Answers

False. Heat radiation from the sun cannot reach Earth, we cannot receive TV or GPS signals from satellites, and we cannot detect the light from distant stars.
Oh, wait . . .

In deeper ocean water, temperature decreases and pressure increases. t/f

Answers

Answer:

It is false.

Explanation:

As the depth of water increases, the pressure also increases.

According to the formula

$P = h * d * g$

Where, h is the depth of water, d is the density of water and g be the acceleration due to gravity

As h increases, pressure also increases.

As depth increases, the temperature of the water also increases, because of geothermic energy of earth.

So, as depth increases, pressure and temperature both increases.

T. this is the reason we haven't reached the deepest part of the Mariana Trench. the pressure is just too much

What kind of energy involves the flow of positive charges?

Answers

Answer:

Electrical energy

Explanation:

Electrical energy is the form of energy that results from the existence of an electric current, that is, a flow of electrical charges, through a metallic conductor cable as a result of the potential difference that a generator is applying at its ends.

Electrical would be the energy that involves the flow of positive charges.

A wave creates a strong undertow

Answers

Hey there!

Answer: A swell

A wave which creates a strong undertow is called a swell. These types of waves are also known as surface gravity waves.

Thank you!

In 1911, Ernest Rutherford and his assistants Geiger and Marsden conducted an experiment in which they scattered alpha particles (nuclei of helium atoms) from thin sheets of gold. An alpha particle, having charge 2e and mass 6.64 10-27 kg, is a product of certain radioactive decays. The results of the experiment led Rutherford to the idea that most of an atom's mass is in a very small nucleus, with electrons in orbit around it. Assume an alpha particle, initially very far from a stationary gold nucleus, is fired with a velocity of 1.50 107 m/s directly toward the nucleus (charge 79e). What is the smallest distance between the alpha particle and the nucleus before the alpha particle reverses direction?

Answers

Answer:

Explanation:

We shall apply conservation of mechanical energy

kinetic energy of alpha particle is converted into electric potential energy.

1/2 mv² = k q₁q₂/d , d is closest distance

d = 2kq₁q₂ / mv²

= 2 x 9 x 10⁹ x 79e x 2e / 4mv²

= 1422 x2x (1.6 x 10⁻¹⁹)² x 10⁹ /4x 1.67 x 10⁻²⁷ x (1.5 x 10⁷)²

= 3640.32 x 10⁻²⁹ /2x 3.7575 x 10⁻¹³

= 484.4 x 10⁻¹⁶

=48.4 x 10⁻¹⁵ m

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