A 3.8 kg object to is lifted 12 meters. approximately how much work is performed during lifing? A) 45.6 J B)588 J C) 466.9J D) 372.4 J

Answers

Answer 1

Answer: You would do mass x distance which is 3.8 kg x 12m which equals A. 45.6 J.

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Answers

Kinetic energy is energy in motion. With that in mind, at a stand still, an object has almost no kinetic energy. Since he is starting to push it, which is moving it, he is increasing the kinetic energy.

B

3 The components of a 15-meters-per-secondvelocity at an angle of 60.° above the horizontal
are
(1) 7.5 m/s vertical and 13 m/s horizontal
(2) 13 m/s vertical and 7.5 m/s horizontal
(3) 6.0 m/s vertical and 9.0 m/s horizontal
(4) 9.0 m/s vertical and 6.0 m/s horizontal

Answers

First draw a picture to help make the problem easier. (see attached)

Next you can use sin and cos to find the x and y components of the velocity.

First lets find the vertical component:
$sin = (opp)/(hyp)$
$sin(60) = (y)/(15m/s)$
Multiply both sides by 15m/s
$15m/s * sin(60) = y$
y ≈ 13 m/s

Now you can find the horizontal component:
$cos = (adj)/(hyp)$
$cos(60) = (x)/(15m/s)$
Multiply both sides by 15m/s
$15m/s * cos(60) - x$
x = 7.5

Therefore the answer is 2, the vertical (y) component is 13m/s and the horizontal (x) component is 7.5m/s.

The components of the velocity are :

(2) 13 m/s vertical and 7.5 m/s horizontal

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Further explanation

Vector is a quantity that has a magnitude and direction.

A vector in a cartesian coordinate is represented by an arrow in which the slope of the arrow shows the direction of the vector and the length of the arrow shows the magnitude of the vector.

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A position vector of a point is a vector drawn from the base point of the coordinates O (0,0) to that point.

The addition of two vectors can be done in the following ways:

$\overrightarrow {AB} + \overrightarrow {BC} = \overrightarrow {AC}$

A negative vector is a vector with the same magnitude but in opposite direction.

$\overrightarrow {AB} = -\overrightarrow {BA}$

Let's tackle the problem!

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Given:

magnitude of the velocity = v = 15 m/s

direction of the velocity = θ = 60°

Asked:

horizontal component of the velocity = v_x = ?

vertical component of the velocity = v_y = ?

Solution:

Firstly , we will calculate the horizontal component of the velocity as follows:

$v_x = v \cos \theta$

$v_x = 15 * \cos 60^o$

$v_x = 15 * (1)/(2)$

$\boxed {v_x = 7.5 \texttt{ m/s}}$

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Next , we will calculate the vertical component of the velocity as follows:

$v_y = v \sin \theta$

$v_y = 15 * \sin 60^o$

$v_y = 15 * (1)/(2) √(3)$

$v_y = 7.5 √(3) \texttt{ m/s}$

$\boxed {v_y \approx 13 \texttt{ m/s}}$

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Learn more

Velocity of Runner : brainly.com/question/3813437

Kinetic Energy : brainly.com/question/692781

Acceleration : brainly.com/question/2283922

The Speed of Car : brainly.com/question/568302
Magnitude of A Vector : brainly.com/question/2678571

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Answer details

Grade: High School

Subject: Physics

Chapter: Vectors

pyrex graduated cylinder has a volume of exactly 200 ml at 0° celsius. if it's temperature increased to 100° celsius what's volume increase or decrease compute the change in volume ?

Answers

1. The volume will increase.

2. The change in the volume is 73 mL

1. Determination of the nature of the new volume.

From the question given above, the following data were obtained:

Initial volume (V₁) = 200 mL

Initial temperature (T₁) = 0 °C = 0 + 273 = 273 K

New temperature (T₂) = 100 °C = 100 + 273 = 373 K

New volume (V₂) =?

Using the Charles' law equation, the new volume of the cylinder can be obtained as follow:

V₁ / T₁ = V₂ / T₂

200 / 273 = V₂ / 373

Cross multiply

273 × V₂ = 200 × 373

273 × V₂ = 74600

Divide both side by 273

V₂ = 74600 / 273

V₂ ≈ 273 mL

From the above calculation, we can see that the new volume increased.

2. Determination of the change in the volume.

The change in the volume can be obtained as illustrated below:

Initial volume (V₁) = 200 mL

New volume (V₂) = 273 mL

Change in volume (ΔV) =?

ΔV = V₂ – V₁

ΔV = 273 – 200

ΔV = 73 mL

Learn more about Charles' law:

brainly.com/question/16927784

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).

The unit of electric potential or electromotive force is the _____.volt
ohm
ampere
franklin

Answers

VOLT is the unit of electric potential or electromotiveforce. The term volt is used to honour an Italian physicist who invented thevoltaic pile, Alessandro Volta.

Volt is a measure of electric potential. Electric potential,a type of potential energy that could bereleased if electric current is allowed to flow.

Its formulas would be:
V = potential energy / charge
V = N * m / coulomb
V = kg * m * m / s² * A * s = kg * m² / A * s³
V = A * Ω
V = W / A
V = J / C
V = eV / e

ohm (Ω) is the unit of electrical resistance.
ampere (A) is the unit for measuring the strength of an electriccurrent
watt (W) is the unit of electrical power

the unit of electromotive force is volt

All of the following are electromagnetic waves excepta. X rays.
b. sound waves.
c. gamma rays.
d. radio waves.

Answers

Sound waves are longitudinal waves. All are the examples of Electromagnetic waves except the sound wave.

EM Waves:

EM waves are transverse waves means the propagation of the wave is the perpendicular the the wave oscillation.

Sound waves:

These are the longitudinal waves because the propagation of the wave is parallel to the vibration of particles.

It needs medium like air and water.

Its speed is very lesser than speed of EM wave.

Therefore, all are the examples of Electromagnetic waves except the sound wave.

To know more about sound wave,

brainly.com/question/21995826

b. sound waves
Sound waves need to travel through a medium such as a solid, liquid, or gas. The sound waves move through each of these mediums by vibrating the molecules in the matter. This means it isn't an electromagnetic waves but it is a wave, an example of the difference, all electromagnetic waves can travel in a vacuum at the universal speed limit, this is 299 792 458 m/s.

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