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3 years ago

The strongest intermolecular forces of attraction exist in a liquid whose heat of vaporization is

Physics

1 answer:

lakkis [162]3 years ago

6 0

Answer:

high

Explanation:

Heat of vaporization is the amount of energy needed to change one kilogram or one mole of a liquid substance to a gas at the same temperature (normally known as the boiling point). If the inter-molecular forces of attraction in the liquid are strong, more energy will be needed to break the bonds, changing the liquid to a gas. So the enthalpy of vapourization of a liquid with strong intermolecular forces will be high

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Two motorcycles are traveling in opposite directions at the same speed when one of the cyclists blasts her horn, which has frequ

Galina-37 [17]

Answer:

6ms^-1

Explanation:

Given that the frequency difference is

( 563- 544) = 19

So alsoThe wavelength of each wave is = v/f = 344 /544

and there are 19 of this waves

So it is assumed that each motorcycle has moved 0.5 of this distance

in one second thus the speed of the motorcycles will be

=> 19/2 x 344/544 = 6.0 m/s

5 0

3 years ago

A force of 30 N is applied tangentially to the rim of a solid disk of radius 0.10 m. The disk rotates about an axis through its

den301095 [7]

Answer:

m = 4.0 Kg

Explanation:

Using an analogy with the Newton's 2nd law for point masses, for rigid bodies, the external net torque on a rigid body, is equal to its rotational inertia (I), times the angular acceleration (α) of the body, as follows:

$\tau_{ext} = I* \alpha (1)$

Since the magnitude of the torque is the product of the value of the force times the perpendicular distance between the line of action of the force and the axis of rotation, and the force is tangential to the rim of the disk, we can write the following expression:

$\tau = F*r*sin 90 = F*r (2)$

For a solid disk, the rotational inertia regarding an axis through its center, and perpendicular to its face is as follows:

$I = \frac{m*r^{2}}{2} (3)$

Replacing (3) in (1), and (2) in the left side of (1) also, we can solve for m, as follows:

$m = \frac{2*30.0N}{0.1m*150(1/s2)} = 4.0 Kg (4)$

So, the mass of the disk is 4.0 Kg.

7 0

3 years ago

Two electrically opposite charges are separated by a fixed distance. Which action will provide the greatest increase in the forc

Alex73 [517]

Explanation:

The electric force between charges is given by the formula as follows :

$F=\dfrac{kq_1q_2}{r^2}$

k is electrostatic constant

r is distance between charges

Here, charges are equal and opposite. So,

$F=\dfrac{kq^2}{r^2}$

It is clear the force is inversely proportional to the distance between charges and directly proportional to the product of charges. So, greatest force will be providing by :