A solid rubber stopper has a mass of 33.0 grams and a volume of 30.0 cm3. What is the density of rubber?

Answers

Answer 1

Answer: mass=33g volume =30cm^3 density=mass/volume = 33/30 =1.1g/cm^3 ans

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A student moves a box across the floor by exerting 23.3 N of force and doing 47.2 J of work on the box. How far does the student move the box?
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At what launch angle will a projectile travel the farthest distance if launched on level ground? Multiple Choice: a. 45 degrees b. 60 degrees c. 20 degrees d. 30 degrees e. 75 degrees

Answers

Answer:

A. 45 degrees

Explanation:

A projectile travels the farthest when it is launched at an angle of 45 degrees.

The maximum range is 45 degrees, ignoring air resistance.

sin(2θ) = 1

∴ 2θ = π/2.

(2θ)/2 = (π/2)/2

θ = π/4

π/4 or 45°

Answer:

A. 45 degrees

Explanation:

What do we call the minimum energy that is required by an electron to leave the metal target in the photoelectric effect?Select one of the options below as your answer: A. energy function B. minimum function C. work function D. quanta E. electrical energy

Answers

Answer:

C. work function

Explanation:

In the photoelectric effect, the energy of the incident photon is used in part to extract the electron from the metal (and this energy is called work function) and the rest is converted into kinetic energy of the electron. In formula:

$hf = \phi +K$

where

hf is the energy of the incident photon, which is the product between h (the Planck constant) and f (the photon's frequency)

$\phi$ is the work function

K is the kinetic energy of the photoelectron as it leaves the material

The work function is what we call the minimum energy that is required by an electron to leave the metal target in the photoelectric effect.

Which is larger an atom or a molecule

Answers

MOLECULE;
For example, a hydrogen atom forms one bond, an oxygen atom forms two, and carbon forms four bonds. Look at that molecule of water again - each hydrogen has one bond, and the oxygen in the middle has two bonds. Molecules can be much bigger.

A ____________ reaction occurs when a substance is broken down into two or more simpler substances in a chemical reaction.

Answers

Answer: Decomposition

Explanation:

A chemical break down of a reactant into two or more products is known as Decomposition reaction. A substance decomposes to simpler substances.

It can be represented as:

AB → A + B

Example, water breaks down into oxygen and hydrogen

2 H₂O → 2 H₂ + O₂

Thus, the correct answer is:

A Decomposition reaction occurs when a substance is broken down into two or more simpler substances in a chemical reaction.

The reaction is called decomposition reaction in which substance(reactant) breaks down into 2 or more substances (products).

In the mobile m1=0.42 kg and m2=0.47 kg. What must the unknown distance to the nearest tenth of a cm be if the masses are to be balanced? The answer is 13.4 In the mobile what is the value for m3 to the nearest hundredth of a kilogram?

Answers

Complete Question

The complete question is shown on the first uploaded image

Answer:

Explanation:

From he question we are told that

The first mass is $m_1 = 0.42kg$

The second mass is $m_2 = 0.47kg$

From the question we can see that at equilibrium the moment about the point where the string holding the bar (where $m_1 \ and \ m_2$ are hanged ) is attached is zero

Therefore we can say that

$m_1 * 15cm = m_2 * xcm$

Making x the subject of the formula

$x = (m_1 * 15)/(m_2)$

$= (0.42 * 15)/(0.47)$

$x = 13.4 cm$

Looking at the diagram we can see that the tension T on the string holding the bar where $m_1 \ and \ m_2$ are hanged is as a result of the masses ( $m_1 + m_2$ )

Also at equilibrium the moment about the point where the string holding the bar (where ( $m_1 +m_2$ ) and $m_3$ are hanged ) is attached is zero

So basically

$(m_1 + m_2 ) * 20 = m_3 * 30$

$(0.42 + 0.47) * 20 = 30 * m_3$

Making $m_3$ subject

$m_3 = ((0.42 + 0.47) * 20 )/(30 )$

$m_3 = 0.59 kg$

Entropy measuresa.
temperature as volume increases.
b.
temperature as pressure increases.
c.
temperature at constant pressure.
d.
messiness.
e.
temperature at constant volume.

Answers

entropy measures : D. Messiness

Entropy often interpreted as the degree of disorder or randomness in the system thermal energy for conversion into mechanical work, so the best way to describe it is it measures 'messiness'

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