3 years ago

(PLEASE HELP) Which of the following describes a mixture?

Physics

2 answers:

vovangra [49]3 years ago

8 0

Answer:

D. A substance made of two or more types of atoms that are not chemically bonded

Explanation:

just took the test and got the answer right

enyata [817]3 years ago

3 0

Answer:

Explanation:

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All points to the of zero on a horizontal number line are negative

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Numbers on the left of zero are negative. Number lines go from smallest to greatest.

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3 years ago

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A hockey puck sliding on a frictionless surface strikes a box at rest. After the collision, the two objects stick together and m

coldgirl [10]

Answer:

Answer:

f) The puck conserves its original momentum but loses some, but not all, of its mechanical energy.

Explanation:

It is a case of perfectly inelastic collision . So momentum will be conserved because no external force acts on them during the collision . But there will be loss of energy ( kinetic energy ) . It will be in the form of sound or heat that is produced during collision. They will still have some kinetic energy even after the collision.

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4 years ago

A box of mass 20kg is pulled up an inclined plane by a force of 285N. Given that the value of the incline angle is 30 degrees an

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Given :

Mass of box , m = 250 kg.

Force applied , F = 285 N.

The value of the incline angle is 30°.

the coefficient of dynamic friction is $\mu=0.72$ .

To Find :

The speed with which the box is moving with, assuming it takes 4 seconds to reach the top of the incline.

Solution :

Net force applied in box is :

$F=285 - mgsin\ \theta - \mu mg cos \ \theta\\ \\F=285-mg( sin \ \theta - \mu cos\ \theta)\\\\F=285 - 20\times 10( \dfrac{1}{2}+0.72\times \dfrac{\sqrt{3}}{2})\\\\F=60.29\ N$