PHYSICS HIGH SCHOOL

The substance that gets broken down in a homogeneous mixture is the .

Answers

Answer 1

Answer:

Solute.

Hopes this helps you all. Good luck with the rest of the test!

Answer 2

Answer: A chemical substance, element or compound. Homogeneous mixtures are complex and not easily broken down.

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Joseph lifted a parcel from the floor. If he lifts the same parcel twice as high, then it will have ____________. A) Half the weight B) The same weight C) Twice the weight D) A weight of zero
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Suppose a yo-yo has a center shaft that has a 0.230 cm radius and that its string is being pulled.(a) If the string is stationary and the yo-yo accelerates away from it at a rate of 1.80 m/s2, what is the angular acceleration of the yo-yo in rad/s2? rad/s2.
(b) What is the angular velocity in rad/s after 0.750 s if it starts from rest? rad/s.
(c) The outside radius of the yo-yo is 3.10 cm.What is the tangential acceleration in m/s2 of a point on its edge? m/s2

Answers

Answer:

Part a)

$\alpha = 782.6 rad/s^2$

Part B)

$\omega = 587 rad/s$

Part c)

$a_t = 24.3 m/s^2$

Explanation:

Part a)

As we know that

$a = R \alpha$

so we will have

$a = 1.80 m/s^2$

$R = 0.230 cm$

$\alpha = (a)/(R)$

$\alpha = (1.80)/(0.230 * 10^(-2))$

$\alpha = 782.6 rad/s^2$

Part B)

Angular speed of the yo-yo

$\omega = \alpha t$

so we have

$\omega = 782.6 * 0.750$

$\omega = 587 rad/s$

Part c)

Tangential acceleration is given as

$a_t = R \alpha$

$a_t = (3.10 * 10^(-2))(782.6)$

$a_t = 24.3 m/s^2$

an object with a mass of 70 kilograms is supported at a height 8 meters above the ground . whats the potential energy of the object with respect to the ground?....A...560 J ...B... 3,430 J...C...5,488.... D...2,058 J

Answers

As per the question the mass of the object is given as 70 kg.

The height of the object from ground is 8 m.

We are asked to calculate the potential energy of that object.

The potential energy of a object is the energy gained by the body due to its position or configuration. The energy due to the position of object from the surface is called gravitational potential energy .

If a body of mass m is at a height of h from the ground,then its potential energy is calculated as -

potential energy $[P.E]= mgh$

where g is the acceleration due to gravity.

we have been given h= 8 m and m= 70 kg

we know that acceleration due to gravity g =9. 8 m/s^2

⇒ $P.E =70 kg *9.8 m/s^2*8 m$

=5488 Joule

Here Joule is the unit of energy.

using the formula E = m* g*h the answer is C...5,488 J. BTW m is mass g is gravitational pull ( 9.8 )and h is height above ground

work of 4 joules is done in stretching a spring from its natural length to 11 cm beyond its natural length. what is the force (in newtons) that holds the spring stretched at the same distance (11 cm)

Answers

The work performed on the spring is

W = 1/2 k x²

so that

4 J = 1/2 k (0.11 m)² ⇒ k ≈ 660 N/m

Then by Hooke's law, the force required to hold the spring in this position is

F = k x = (660 N/m) (0.11 m) ≈ 73 N

A _____ is used in a motor to switch the direction of the magnetic field created by the current.The rotating part of a motor that holds the electromagnets is called the _____.
Electric current passes through the _____ and into the electromagnets in an electric motor.
A motor turns _____ energy into _____ energy.

Answers

Answer:

A _commutator_ is used in a motor to switch the direction of the magnetic field created by the current.

The rotating part of a motor that holds the electromagnets is called the __armature___.

Electric current passes through the _brushes_ and into the electromagnets in an electric motor.

A motor turns _electrical_ energy into _mechanical_ energy.

Explanation:

A commutator, which is a split ring rotary switching device, reverses the direction of the current between the external circuit and the rotor. Reversing the current reverses the magnetic field.

The armature comprises the rotating part of the motor and the electromagnets

A brush is the electrical contact for conducting current through the moving and stationary parts of an electric motor

An electric motor turns electrical energy into mechanical energy.

Total discharge head includes?

Answers

The term “total” indicates that it includes the static pressure head (h), the velocity head (hv), and the elevation head (Z).

Magnesium is a metal that is commonly used in products that needed to be light weight. Suppose a 2.00kg piece of magnesium has 8160 j of entertainment added to it it's temperature increases 4K what is the specific heat of magnesium