**Answer:**

**Explanation:**

Lowest tension will occur when the rope is also horizontal.

F = ma

F = 1710(1.30)

**F = 2223 N**

Which sentence states Newton's second law?

**Answer:**

Force is equal to the change in momentum per change in time.

**Explanation:**

That situation is described by Newton's Second Law of Motion. According to NASA, this law states, "Force is equal to the change in momentum per change in time. For a constant mass, force equals mass times acceleration." This is written in mathematical form as Force = mass.

A body is thrown up into the air takes a time of 4s to reach the height. What is the velocity with which the body was thrown up.(g=10ms2)

**Answer:**

40m/s

**Explanation:**

V= u + at

v= 0

a= -10

t= 4

0= u -40

u= 40m/s

just trial!!!!!!!

which one would cool down faster, water or a block of concrete? why?

**Answer:**

If you mean by temperature

Water, cause say the water just sits there, it'll take a few minutes to cool down. But for concrete having all the hot sun rays on it during summer, can make it very hot, if you put 'cold water' there, it'll only last there for a moments (and that's by effect not waiting), if you wait for it to cooldown by itself, it'll take quite awhile.

If you mean solidify:

The stuff required to make concretes takes HOURS and HOURS to finish solidifying, unlike water being turn into ice normally only takes about half an hour or an hour (maybe 2) in the freezer (I don't know how long for ice, but not long at all in comparison to concrete).

**Explanation:**

Explanation was mostly part of the answer

what is dispersion of light?

**Answer:**

[tex] \huge \bold \blue{ \underline{ answer}}[/tex]

The splitting up of light into its constituent colours while passing from one medium to the other is called dispersion.

just this last one!!

A car slams on its brakes creating an acceleration of -4.7 m/s^2. It comes to rest after traveling a distance of 235 m. What was its velocity before it began to accelerate?

**Answer:**

[tex]47 \ \frac{m}{s}[/tex]

**Explanation:**

s = displacement (m)

u = initial velocity [tex](\frac{m}{s})[/tex]

v = final velocity [tex](\frac{m}{s})[/tex]

a = acceleration [tex](\frac{m}{s^{2} })[/tex]

t = time (s)

s = 235

a = -4.7

v = 0

v² = u² + 2as

(0)² = u² + 2(-4.7)(235)

u² - 2209 = 0

u² = 2209

u = 47

**Answer:**

[tex]\boxed {\boxed {\sf 47 \ m/s}}[/tex]

**Explanation:**

We are asked to find the initial velocity of the car before it began to accelerate.

We are given the acceleration, distance, and final velocity, so we will use the following kinematic equation:

[tex]{v_f}^2 = {v_i}^2 + 2ad[/tex]

The car's acceleration is -4.7 meters per second square. It traveled a distance of 235 meters. It came to rest, or a final velocity of 0 meters per second.

a= -4.7 m/s²d= 235 m [tex]v_f[/tex]= 0 m/sSubstitute the values into the formula.

[tex](0 \ m/s)^2 = {v_i}^2 + 2 (-4.7 \ m/s^2)(235 \ m)[/tex]

[tex]0 = {v_i}^2 + 2 (-4.7 \ m/s^2)(235 \ m)[/tex]

Multiply the numbers in parentheses.

[tex]0= {v_i}^2 + (-2209 \ m^2 / s^2)[/tex]

Add -2209 to both sides of the equation.

[tex]0+ 2209 \ m^2 /s^2 = {v_i}^2+ ( -2209 \ m^2 /s^2 )+ 2209 \ m^2 /s^2[/tex]

[tex]2209 \ m^2 /s^2 = {v_i}^2[/tex]

Take the square root of both sides.

[tex]\sqrt {2209 \ m^2 /s^2} = \sqrt {{v_i}^2[/tex]

[tex]\sqrt {2209 \ m^2 /s^2} = v_i[/tex]

[tex]47 \ m/s = v_i[/tex]

The inital velocity of the car was **47 meters per second.**

What does water’s high specific heat capacity explain about water?(1 point)

why water bonds with other molecules

why water bonds with other molecules

why water is unable to absorb energy

why water is unable to absorb energy

why water is liquid at room temperature

why water is liquid at room temperature

why water is often used as a solvent

**Water’s** high **specific heat capacity** explain why water is liquid at room temperature

*option ***C*** is the correct answer.*

The** specific heat capacity** of an object is the amount of **heat** required to raise the temperature of a unit mass of the substance by 1 kelvin.

The relationship between **specific heat capacity** and **heat capacity** of a substance is given as;

c = Q/mΔθ

where;

Q is the quantity of heat c is the specific heat capacitym is the mass of the substanceΔθ is the change in temperatureA high **specific heat capacity** implies that the substance absorbs more energy to change its state.

Thus, **water** has a **high specific heat,** meaning it takes more energy to increase the temperature of water compared to other substances. When water absorb more heat energy, it changes its state.

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Which one of the following statements concerning a collection of gas molecules at a certain temperature is true?A. The lower the temperature, the greater are the molecular speeds. B. Most of the molecules have the same kinetic energy. C. All molecules possess the same momentum. D. The molecules have a range of kinetic energies. E. All molecules move with the same velocity.

**Answer:**

D Is true - the velocities (and squared) follow the appropriate statistical curve

The molecules have a range of **kinetic energies **at a certain temperature. As the **temperature** increases, their kinetic energy and molecular speed increases.

**Kinetic theory **of gases describes the nature of **ideal gases** and their volume, pressure and kinetic energy. As per this theory the gases are made of tiny particles which have negligible mass compared to that of the container.

**Kinetic theory** states that the** kinetic energy** of all gases increases with increase in temperature which is independent of the masses and and at certain temperature all the gases are having same range of kinetic energies.

The velocity of all the gaseous particles increases with increasing in temperature which results in the increase in kinetic energy. Hence, option** D** is correct.

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Use the periodic table to answer the question.

An illustration shows the periodic table of elements with elements arranged in increasing order of atomic number in 18 columns (groups) and 7 rows (periods).

Which comparison is correct?

(1 point)

PH3 is a stronger acid than NH3.

PH, 3, is a stronger acid than NH, 3, .

HF is a stronger acid than HCl.

HF is a stronger acid than HCl.

H2S is a stronger acid than HCl.

H, 2, S is a stronger acid than HCl.

NH3 is a stronger acid than HF.

Answer:

A: P and N are both nonmetals, same strength: No

B: Most likely not

C: Same saying as B

D: Most likely yes

Explanation:

I don't actually know if i'm right, I just want to help you okay, so if it's wrong than sorry. Also I couldn't tell if the CI is a Ci(17) or CL(6+53)

Part reason why I was saying that B and C are most likely incorrect. And D the NH3 has more value than HF (if I remember)

As per the given **situation**, [tex]PH_3[/tex] is **stronger** **acid** than [tex]NH_3[/tex]. The correct option is **A**.

Any substance that tastes **sour** in water, turns **blue** **litmus** paper red, reacts with some metals to liberate **hydrogen**, reacts with bases to form salts, and promotes chemical reactions is considered an acid (acid catalysis).

Because **strong** **acids** have mostly ions in solution, the bonds that hold H and A together must be weak. Strong acids easily **dissociate** into ions.

Because weak acids exist **primarily** as **molecules** with only a few ions in solution, the bonds that hold H and A together must be strong.

[tex]PH_3[/tex] is a more **potent** **acid** than [tex]NH_3[/tex]. as PH3 has a pKa of -5.5 and [tex]NH_3[/tex] has a pKa of 9.9.

Thus, the correct option is **A**.

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a heat engine is a device that uses to produce useful work

**A heat engine is a device that uses to produce useful work.
**

**
**

**Definition - a device for producing motive power from heat, such as a gasoline engine or steam engine.
**

**
**

**So..
**

**
**

**If this is a true or false question.. Your answer is:
**

**
**

**TRUE**

**Answer:**

HEAT

**Explanation:**

An object is projected with speed of 4ms at an angle of 60° to horizontal. Calculate the time of flight of the object. (g=10ms2)

0.8 seconds

**Explanation:**

time of flight = 2u/g

u=4m/s

g=10

= 8/10

= 0.8 sec

just a trial...not sure!!!

Given :

∅ = 60⁰

u = 4 m/s

g = 10m/s²

to find :

T = ?

Solution :

as per formula,

[tex]t = \frac{2u \: sin \theta}{g} [/tex]

now put the value : [tex]t \: = \frac{2 \times 4 \times sin \: 60}{10} [/tex]

as we know [tex] sin60 \: = \frac{ \sqrt{3} }{2} [/tex]

therefore,

[tex]t \: = \frac{8 \times \frac{ \sqrt{3} }{2} }{10} [/tex]

as we solve this we get,

[tex]t \: = \frac{ 2\sqrt{3} }{5} [/tex]

that's t = 0.69 sec

[tex]\sf\fbox\red{\:I \:hope \:it's \:helpful \:to \:you}[/tex]

Four balls with different masses are dropped from the heights shown. Air resistance may be ignored. Which ball has the greatest average speed?

**Answer:**

The one falling from the greatest height will have the greatest speed.

h = 1/2 g t^2 time for ball to fall distance h

h2 / h1 = t2^2 / t1^2 dividing equations

h2 / t2^2 = h1 / t1^2

Let v be the average speed (v2 = h2 / t2)

1 / t2 * v2 = 1 / t1 * v1

v2 / v1 = t2 / t1 the one taking the longest to fall has the greater av. speed

Check:

h4 / h1 = t4^2 / t1^2 or

t4 / t1 = (h4 / h1)^1/2

In this case t4 / t1 = (4 / 1)^1/2 = 2 or twice the average speed

t1 = (2 h / g)^1/2 = .2^1/2 = .447 using g = 10

t4 = (2 h / g)^1/2 = .8^1/2 = .894

v1 = 1 / .447 = 2.24 m/s average speed

v4 = 4 / .894 = 4.47 or twice the average speed

Two a.c V1=100sin(wt) and V2 = 150cos(wt) are fed into one circuit, determine the combined output of the two as a single a.c

**Answer:**

**Explanation:**

V = 100sin(ωt) + 150cos(ωt)

let x = ωt

V = 100sin(x) + 150cos(x)

a maximum or minimum will occur when the derivative is zero

V' = 100cos(x) - 150sin(x)

0 = 100cos(x) - 150sin(x)

100cos(x) = 150sin(x)

100/150 = sin(x)/cos(x)

0.6667 = tan(x)

x = 0.588 rad

V = 100sin(0.588) + 150cos(0.588)

V = 180.27756

as the maximum will not occur until ωt = 0.588 radians, for a cosine function we subtract that amount as a phase angle φ

**V = 180.3 cos(ωt - 0.588)**

or as a sine function, the phase angle lags the cosine by a difference of π/2

V = 180.3sin(ωt - (0.588 - π/2)

**V = 180.3sin(ωt + 0.983)**

7. What is the velocity of an object with a distance of 90m south and a time of

5s?

Answer:

Explanation:

v= s/t

V =90m/5s

V = 8m/s

A 2.55 kg piece of lead at 40 degree Celsius is placed in a very large quantity of water at 10 degree Celsius and thermal equilibrium is eventually reached. Calculate the entropy change of the lead that occurs during this process. The specific heat of lead is 130 J/(kg K).

6.6 J/K

1.4 J/K

190 J/K

100 J/K

6.2 J/k

i think this is a answer

How do I measure the drag of a paper airplane?

**Answer:**

hmmmmm ill get back later

**Explanation:**

at room tmeperature none of the metals are

**What metal is not at room temperature?
**

**Mercury is a metallic chemical element that is an only metal that is not a solid at room temperature.**

You are on the roof of a building 30 m above the ground. Using hand crank 3 points

you are to lift a 300 kg dresser on to the roof. How much work must to

generated to lift the dresser? *

**Answer:**

The work will increase the potential energy.

W = PE = mgh = 300(9.8)(30) = **88200 J**

what is the relationship between work and mechanical advantage

Answer:

Mechanical efficiency: the comparison of the machine's work output with it's work input

Mechanical advantage: the number of times that the machine multiplies the force

Explained:

Mechanical efficiency: the comparison of the machine's work output with it's work input

Mechanical advantage: the number of times that the machine multiplies the force

Explained:

Michelle recently started selling her invention: A bed that looks like it floats in mid-air. The bed is actually suspended by magnetic forces. Michelle is a(n)

**Answer:**

**Explanation:**

designer

illusionist

engineer

entrepreneur

salesperson

human

inventor

A child on ice skates is given a small push from behind by a parent. How are forces used to describe the resulting motion?(1 point)

Because of equal and opposite reactions, there will be a force opposing the push from the parent, and they will not move.

Because of equal and opposite reactions, there will be a force opposing the push from the parent, and they will not move.

There is an unbalanced force on the child, and the child’s motion will change direction or increase speed.

There is an unbalanced force on the child, and the child’s motion will change direction or increase speed.

There is a balanced force on the child, and the child’s motion will change direction or increase speed.

There is a balanced force on the child, and the child’s motion will change direction or increase speed.

Because of equal and opposite reactions, the child will move in the opposite direction to the force.

A child on ice skates is given a small push from behind by a parent. There is an **unbalanced force** on the child, and the child’s motion will change **direction** or increase **speed**.

A child on ice skates is given a small push from behind by a parent. How are forces used to describe the resulting motion?

Because of equal and opposite reactions, there will be a force opposing the push from the parent, and they will not move.A child on ice skates is given a small push from behind by a parent. There is an **unbalanced force** on the child, and the child’s motion will change **direction** or increase **speed**.

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Section 1: Basic Energy Relationships

1. Click/tap the Start button and observe the motion. View the bar

charts and the velocity value as the coaster car moves. Complete

the following paragraph by entering total mechanical energy

(ME), kinetic energy (KE), and potential energy (PE). The

labeled locations refer to the graphic at the right.

As the coaster car rolls down the track from A to E, the

________ values decrease and the _______ value

increase and the ________ values remain constant. The

_______ is greatest at point A and smallest at point E.

However, the _______ is smallest at point A and largest

at point E.

Section 2: Hill Design

2. Click/tap on the Bumps tab at the top of the

Interactive. Then drag the grey circles to modify the

track so that it looks like the track design at the right.

Pay attention to the background grid to help with the

design. Note that Dot G is at the same height as Dot E;

make sure that the same is true of your final design.

3. Run the simulation. Does the coaster car travel as high

as point H? ___________ Give an explanation for why

it does or doesn't reach point H.

As the coaster car rolls down the track from A to E, the **potential energy** values decrease and the** ****kinetic energy** value increase and the **total mechanical energy** values remain constant. The **potential energy**** **is greatest at point A and smallest at point E. However, the **kinetic energy**** **is smallest at point A and largest at point E.

According the principle of **conservation of mechanical energy**, as the **potential energy **decreases, the **kinetic energy** increases.

[tex]P.E + K.E = M.A[/tex]

At **point A**, the coater has **maximum potential energy**.

At **point E**, the coaster has **maximum kinetic energy**.

We can **fill **the** blanks** as follows;

As the coaster car rolls down the track from A to E, the **potential energy** values decrease and the** ****kinetic energy** value increase and the **total mechanical energy** values remain constant. The **potential energy**** **is greatest at point A and smallest at point E. However, the **kinetic energy**** **is smallest at point A and largest at point E.

Based on the principle of **conservation of mechanical energy**, if the second simulation occurs at the same condition as the first, the height reached by coaster will be same.

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When laser light of wavelength 632.8 nm passes through a diffraction grating, the first bright spots occur at ± 17.8 ∘ from the central maximum. What is the line density

Answer:

Depends on the weight i would be 7.120

A simple machine where an inclined plane is wrapped in a spiral is called a lever.

**Answer:**

Cool. What’s the Question?

**Explanation:**

A student removed a wool hat from her head. Her hair stood up from static electricity. What did her hat do to cause this

**Answer:**

A student removed a wool hat from her head. Her hair stood up from static electricity. What did her hat do to cause this? ... Yes, the motor would run faster because the increased electrical force increases the magnetic force in the motor.

A **student **removed the wool from her head due to the **static charge **of electricity, it is caused.

A **difference** in electric charge within, on the surface of, or between two materials results in static **electricity**. Until it can be expelled through an **electrical **discharge or current, the **charge **stays. In contrast to current electricity, which transmits energy by letting an electric charge flow through a conductor or a space, **static electricity **does not transport energy.

When two **surfaces **come into contact, wear, and separate from one **another **when at least a single surfaces has a good **resistance **to electric **current**, a static electrostatic attraction can be produced. Because individuals can feel, hear, and even see a spark when the extra charge is neutralized when placed close to a **powerful **electrical **conductor**, most people are familiar with static electricity's effects.

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The vertical and horizontal components of the velocity of a golf ball after being struck by a club are 4.0 m s1 and 5.0 m s respectively. Determine the magnitude and direction of the velocity of the golf ball. A 6.30 m s-1 B 6.35 m s-1 C 6.40 m s-1 D 6.45 m 5-1

The **magnitude **and** direction **of the velocity of the **golf ball **is** 6.4 m/s **at** 38.7⁰.**

The given parameters:

The **magnitude **of the **resultant velocity** of the golf ball is calculated as follows;

[tex]v= \sqrt{v_y^2 + v_x^2} \\\\v = \sqrt{4^2 + 5^2} \\\\v = 6.4 \ m/s[/tex]

The **direction **of the **golf ball's velocity **is calculated as follows;

[tex]\theta = tan^{-1} (\frac{v_y}{v_x} )\\\\\theta = tan^{-1}(\frac{4}{5} )\\\\\theta = 38.7 \ ^0[/tex]

Thus, the **magnitude **and** direction **of the velocity of the **golf ball **is** 6.4 m/s **at** 38.7⁰.**

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please help

Two masses m1 and m2, are a distance R apart and mq exerts a gravitational force F on m2. What is the gravitational force is the gravitational force on M1?

**Answer:**

**F**

**Explanation:**

for every action there exists an equal and opposite reaction. The force acting on the two masses is identical in magnitude, but opposite in direction.

Based on the law of conservation of mass, if approximately 20g of water reacts in the following equation,

producing about 15g of oxygen, what mass of hydrogen (H2) was produced in this reaction?

2H20

2H2 + O2

**Answer: H2O2**

**Explanation:**

First, calculate the moles of **H2O2 **reacting. In order to do this, we must evaluate the relative molecular mass ( Mr ) of hydrogen peroxide

Explain why the temperature is not changing at X

**Answer:**

The temperature is constant at 'X'. No increase or decrease. Would be same answer if there were a 'X' at temperature 'D'.

Slope of graph is zero so no change in the **temperature. **

What is temperature?

**Temperature **is a physical quantity that expresses quantitatively the perceptions of hotness and coldness. **Temperature** is measured with a thermometer.

Given graph of** temperature** and time, at position x there in no change in temperature with time so** temperature** is not changing.

Slope of graph is zero so no change in the **temperature. **

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During what time period does the balloon drift in a counterclockwise direction?

Yeh it’s 9am to 10 pm

why does gas have the most energy but moves the slowest

Gases have heavier molecules. Since all gases have the same average kinetic energy at the same temperature, lighter molecules move faster and heavier molecules move slower on average.

Which phrase best describes the relationship of the underlined words in this sentence? I was tired from the long, exhausting journey and wanted to relax in the comfort of home. O A. Word-synonym O B. Part-whole - O C. Item-category O D. Word-connotation
Give 4 facts about the alkali metals
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Choose ALL answers that describe the polygon GHIJ if GH = 48, HI = 72,IJ = 33, JG = 73, mZG = 82, m_H 86, mZI = 94, mZJ = 98,and GH IJ.A) ParallelogramB) QuadrilateralC) RectangleD) RhombusE) SquareF) Trapezoid
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To compare the teaching methodologies of two of its eighth-grade math teachers, a school decides to compare student test scores from the two classes throughout the year. Which type of statistical study is the school conducting?.
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