A cup of hot water cannot melt a large block of ice. However, the same block melts when dropped into a lake. This is because

Answer:

2.4 kg

1 kg = 10N

2.4 kg = ?

2.4 kg = 24N

On the moon 1/6th

1/6 * 24 = 4N

therefore weight of the textbook on the moon would be 4N

Answer:

22050 J

Explanation:

Given Mass of the ball, m = 4.5 Kg

Height, h =500 m

Acceleration due to gravity, [tex]g= 9.8m/s^{2}[/tex]

To calculate the potential energy we use formula,

[tex]PE = mgh[/tex]

Substituting the given values, we get

PE = 4.5× 9.8×500

    =22050 J

The potential energy loss for a 4.5 kg bowling ball rolling down a 500m hill would be approximately 221325 Joules in an idealized scenario.

The potential energy loss of an object rolling down a hill can be calculated using the formula for gravitational potential energy, PE = mgh, where m is the mass of the object, g is the gravitational acceleration (9.81 m/s² on Earth), and h is the height of the hill. So, for a 4.5 kg bowling ball rolling down a 500m hill, the potential energy loss would be PE = (4.5 kg) * (9.81 m/s²) * (500 m), which equals 221325 Joules. However, it's important to note that this is an idealized calculation and in real scenarios some of this energy would be transferred into other forms such as kinetic energy as the ball speeds up, and thermal energy due to friction.

Relevant concepts: Potential Energy, Kinetic Energy, and Gravitational Potential Energy.

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Answer:

0.74 s

Explanation:

We can solve the problem by using the following SUVAT equation:

[tex]d = ut + \frac{1}{2}at^2[/tex]

where

d = 5.0 m is the displacement

u = 7.2 m/s is the initial velocity

a = -1.1 m/s^2 is the acceleration (which is negative since it is a deceleration)

t is the time

Substituting numbers into the equation, we find:

[tex]5.0 = 7.2 t -0.55t^2\\0.55t^2 -7.2t + 5.0 = 0[/tex]

This is a second-order equation, whose solutions are given by:

[tex]t=\frac{-(-7.2) \pm \sqrt{(-7.2)^2-4(0.55)(5.0)}}{2(0.55)}[/tex]

And the solutions are

t = 0.74 s

t = 12.36 s

The solution we are looking for is the first one, because it corresponds to the first time at which the hockey puck has travelled the distance of 5.0 m, reaching the goal.

The goalie has approximately 6.55 seconds to stop the hockey puck. This is calculated using the motion equation v = u + at, taking into account that the puck is decelerating.

This is a question of physics, specifically dealing with the concept of motion and deceleration. We use the equation of motion that relates final velocity (v), initial velocity (u), acceleration (a), and time (t): v = u + at. However, since the puck is decelerating, we are actually dealing with a negative acceleration.
Therefore, the equation becomes final velocity (0 m/s because it will eventually stop sliding) = initial velocity (7.2 m/s given) + acceleration (-1.1 m/s²) * time.
By rearranging this equation we can solve for time (t): t = (final velocity - initial velocity) / acceleration. So it then becomes t = (0 - 7.2) / -1.1. Solving this yields a time of approximately 6.55 seconds for the puck to stop.

Note: The distance to the goal does not play a role in the time it takes for the puck to stop sliding because the puck's motion is determined by its initial velocity and deceleration, not its destination.

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Answer:

running or skipping

Explanation:

feelin yourself and talking to quiet

just stay still and talk with a decent voice but no too loud

Answer:

Micro waves and radio waves are electromagnetic waves while ocean wave  and seismic wave are mechanical waves.

Explanation:

Electromagnetic waves do not require a medium for propagation. They can travel along vacuum just like they travel through matter.

Further examples of electromagnetic waves are x rays, infrared waves etc.

Spectrum of electromagnetic waves in the increasing order of frequency is radio waves, microwaves, infrared waves, visible light, ultraviolet, x ray, gamma ray.

Mechanical waves require a medium for propagation. Thus they cannot travel through a vacuum.

Sound wave is an example of mechanical wave.

Final answer:

Microwaves and radio waves are electromagnetic waves that do not require a medium to travel, whereas ocean waves and seismic waves are mechanical waves that require a medium for their propagation.

Explanation:

Waves can be broadly classified into two categories: mechanical waves and electromagnetic waves. This classification is based on whether the waves require a medium to travel through or not.

To summarize, microwaves and radio waves are electromagnetic in nature, capable of traveling through a vacuum, whereas ocean waves and seismic waves are mechanical, needing a medium to propagate.

Answer:

The magnitude of the resultant vector R is 50 meters ⇒ 2nd answer

Explanation:

The resultant vector is the vector sum of two or more vectors

If the two vectors perpendicular to each other, then the magnitude of

the resultant vector is the square root of the sum of their squares

If x and y are two vectors perpendicular to each other, then the

magnitude of its resultant vector R is:

→ [tex]R=\sqrt{x^{2}+y^{2}}[/tex]

Lets solve the problem

A right triangle with the base labeled 40 meters and the height labeled

30 meters

The hypotenuse is a dotted arrow labeled R

→ The base and the height of the right triangle are perpendicular

→ The hypotenuse is the resultant vector of them

Assume that x represents the base of the triangle and y represents the

height of it

By using the rule above

→ x = 40 m , y = 30 m

→ [tex]R=\sqrt{x^{2}+y^{2}}[/tex]

→ [tex]R=\sqrt{(40)^{2}+(30)^{2}}[/tex]

→ [tex]R=\sqrt{1600+900}[/tex]

→ [tex]R=\sqrt{2500}=50[/tex]

The magnitude of the resultant vector R is 50 meters

Answer:

The mass of the monument (to the nearest tenth)  where volume of the granite monuments is  [tex]25,365.4 \mathrm{cm}^{3}[/tex] and density of the granite is  [tex]2.7 g / \mathrm{cm}^{3}[/tex] is  68,486.6 g          

 Explanation:  

Given:

Volume of the granite monument, p[tex]=25,365.4 \mathrm{cm}^{3}[/tex]

density of granite, [tex]V=2.7 \mathrm{g} / \mathrm{cm} 3[/tex]

To find:

The mass of the monument to the nearest tenth= ?

Solution:

Step 1:

mass of the monument ,[tex]m=p V \text { grams }[/tex]

step 2:

[tex]m=p V[/tex]

substituting the values,

m[tex]=(25,365.4)(2.7)[/tex]

m[tex] =68,486.58 g[/tex]

m [tex]= 68,486.6 g[/tex]           (rounding off to nearest tenth)

Result :

The mass of the monument (to the nearest tenth) where volume of the granite monuments is  [tex]25,365.4 \mathrm{cm}^{3}[/tex] and density of the granite is [tex]2.7 \mathrm{g} / \mathrm{cm}^{3}[/tex] is 68,486.6 g.           

The mass of the granite monument is 68,486.58 g  which has a volume of [tex]25364.4 cm^{3}[/tex] and density of [tex]2.7 gcm^{-3}[/tex].

Given data:

To calculate the mass of the granite monument, we can use the formula:

mass = density * volume

Given that the density of granite is [tex]2.7g cm^{-3}[/tex] and the volume of the monument is [tex]25364.4 cm^{3}[/tex]

we can substitute these values into the formula:

mass = 2.7  * 25,365.4 

Calculating the mass:

mass = 68,486.58 g

To express the mass in kilograms, we can divide by 1000 (since there are 1000 grams in a kilogram):

mass = 68,486.58 g / 1000 kg

Calculating the mass in kilograms:

mass = 68.48 kg

Hence, the mass of the granite monument is approximately 68.57 kg, rounded to the nearest tenth.

To learn more about density, refer:

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Answer:

B) chemical potential energy

Explanation:

Your body uses chemical energy from the food you eat to power your motion.

For this case we have that by definition, physical power refers to the amount of work done for a unit of time.

So:

[tex]P = \frac {W} {t}[/tex]

Where:

W: It's the work

t: It's time

The power units are in [tex]\frac {Joules} {s} = Watts[/tex]

So, according to the problem data we have:

[tex]P = 100W\\t = 120s[/tex]

Clearing the work of the formula:

[tex]W = P * t\\W = 100 * 120 = 1200[/tex]

Thus, the work is 1200 joules.

Answer:

Option C

Answer:

I guess that the answer is plants play a vital role In the water cycle.

Answer:

Plants play a vital role in the water cycle.

Explanation:

Vegetation plays an important role in the water cycle by preventing soil erosion and increasing groundwater levels. In areas with thick vegetation cover, the foliage cover breaks the force of precipitation falling on the ground, which may otherwise cause erosion.

Answer: [tex]d < a < c < b[/tex]

[tex]3.3 cm < 400 mm < 170 m < 22 km[/tex]

Explanation:

Firstly, let's convert these length to meters [tex]m[/tex], in order to work with the same units:

a. 400 millimeters

[tex]400 mm \frac{1m}{1000 mm}=0.4 m[/tex]

b. 22 kilometers

[tex]22 km \frac{1000m}{1 km}=22000 m[/tex]

c. 170 meters

Here the lenght is already in meters

d. 3.3 centimeters

[tex]3.3 cm \frac{1m}{100 cm}=0.033 m[/tex]

Now that we have all the lengths in meters, we can order them from shortest to longest:

[tex]0.033 m < 0.4 m < 170 m < 22000 m[/tex]

or

[tex]d < a < c < b[/tex]

Answer:

A what? Is this even a question?

Explanation:

????

Answer:

True, the statement is correct

Answer:

True

Explanation:

Weather: It is the atmospheric condition for a small area over a short span of time. For example: cloudy weather. If one place is witnessing this condition it may or may not be same for all the places.

Climate: It refers to the atmospheric condition of an area over a long period of time for say a decade or a century. For example: the climate of the polar region is changing drastically and resulting in the reduction of glacial ice.

Answer:

√(r³ / (MG))

Explanation:

The dimensions of each variable are:

r = [m]

G = [m³/kg/s²]

M = [kg]

Multiplying M and G eliminates kilograms:

MG = [m³/s²]

The radius cubed divided by MG eliminates meters:

r³ / (MG) = [s²]

The square root gives us seconds:

√(r³ / (MG)) = [s]

Kepler's third law relates the time  period of a planet to its orbital radius r, the gravitational constant G  and the mass of the sun M, the combination of these factors gives the correct dimensions for the period of a planet would be √( 4πr³/GM)

There are three laws of Kepler as follows

The orbit of the planet is elliptical and the sun is present at one of the two focuses of the elliptical path followed by the revolving planet.

A line segment joining a planet and the Sun covers equal areas during equal intervals of the time period.

The square of a planet's orbital period is proportional to the cube of the length of the semi-major axis of its elliptical orbit.

Think about a small mass M traveling in a circle around a large mass M. The centripetal force for mass m comes from gravity. Taking circular motion as an example and applying Newton's second law,

gravitational force balances the centripetal force

GMm/r²  = mv²/r

GM/r = v²/r

Let us take a Time period of the orbital is P

v = 2πr/P

GM/r = 4πr²/P²

P² = 4πr³/GM

P = √( 4πr³/GM)

Thus the correct dimension for the time period in terms of the orbital radius (r), gravitational constant (G ), and the mass of the sun (M) would be √( 4πr³/GM).

Learn more about Kepler's laws of planetary motion

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Answer:

2.5 m/s

0 m/s

Explanation:

Average speed is distance over time.

Average velocity is displacement over time.

The bicycle travels 150 meters from A to B, then 150 meters from B to A.  So the distance is 300 meters and the displacement is 0 m.

s = 300 m / 120 s = 2.5 m/s

v = 0 m / 120 s = 0 m/s

Answer:

Vector quantity

Explanation:

physical quantity that has both magnitude and direction is called vector quantity.

Answer:

Vector

Explanation:

A vector is a quantity that is composed of a magnitude and a direction.

Some examples of vectors are forces. A force has a magnitude that indicates how large or small it is, and also has a direction that indicates where this force is being exerted.

Another popular example of a vector is velocity.

Answer:

a) 6 m/s

b) 14 m/s

Explanation:

Acceleration is change in velocity over change in time.

a) a = Δv / Δt

2 m/s² = (v − 4 m/s) / 1 s

v = 6 m/s

b) a = Δv / Δt

2 m/s² = (v − 4 m/s) / 5 s

v = 14 m/s

Answer:

The Autocratic system of governance

Explanation:

This is because,in Autocratic system of governance decision making is done by only individual. And his/her decision is final.

Answer:

The Autocratic system of governance

Explanation:

Answer:

Within a compound machine, the output force of one simple machine becomes the input force of another simple machine.

Answer:

a,d,e

Explanation:

all of those are true for it orbits the earth witch orbits the sun

the moon has no atmosphere for if it did then there would be a higher chance for water and plants on the moon

the moon is less deans than the earth and its gravitational pole is 1.62 m/s^2

and in your text book it says Tides are the daily rise and fall of sea level at any given place. The pull of the Moon’s gravity on Earth is the primary cause of tides and the pull of the Sun’s gravity on Earth is the secondary cause. The Moon has a greater effect because, although it is much smaller than the Sun, it is much closer. The Moon’s pull is about twice that of the Sun’s

Answer:

A. B. D. E.

Explanation:

all of those are true for it orbits the earth witch orbits the sun

the moon has no atmosphere for if it did then there would be a higher chance for water and plants on the moon

the moon is less deans than the earth and its gravitational pole is 1.62 m/s^2

and in your text book it says Tides are the daily rise and fall of sea level at any given place. The pull of the Moon’s gravity on Earth is the primary cause of tides and the pull of the Sun’s gravity on Earth is the secondary cause. The Moon has a greater effect because, although it is much smaller than the Sun, it is much closer. The Moon’s pull is about twice that of the Sun’s.

The meteor accelerates is the true statement about motion when it is approaching Earth.

Answer: Option B

Explanation:

Meteor is referred as the rock or a body made of metal wandering in space. The earth has gravitational pull and when any object or anything comes by, it gets accelerated.

Similarly when a meteor approached the earth, it gets pulled by gravitational force acting upon the earth and it gets accelerated and is forced to move into the earth's field.

Answer:

the meteor accelerates

Answer:

a=0.27637 m/s²

Explanation:

Hello,

You should remember that ;

Stopping distance=reaction distance + braking distance

First find the reaction distance which is that distance traveled from point of detecting danger to start of breaking process.

Formula: d=(s*r) where s is speed in m/s and r is reaction time in seconds

Given: s=12m/s  and r=0.79 s

d= 12*0.79=9.48 m

Remaining distance to cover and stop

Where distance from locomotive to railroad crossing is 260, then remaining distance will be;

270m-9.48m=260.52 m

To get magnitude of minimum deceleration to avoid an accident you apply the formula:

v²=u²-2as

where

v= final speed = 0 m/s

u=speed of locomotive = 12 m/s

a=acceleration in m/s²

s=remaining distance to cover

v²=u²-2as

0²=12²-2*a*260.52

0=144-521.04 a

144/521.04= 521.04/521.04a

a=0.27637 m/s²

Hope this Helps!

Answer:

7÷10

Explanation:

initial velocity=7m/s

final velocity=0m/s

Answer:

-1.4 m/s²

Explanation:

The initial velocity is 7 m/s.  When the ball rolls back, its velocity is -7 m/s.

Acceleration is change in velocity over change in time.

a = Δv / Δt

a = (-7 m/s − 7 m/s) / 10 s

a = -1.4 m/s²

Answer: Somewhere with high temperatures.

Explanation:

Answer:

Because the material is meant to coat roofing shingles to keep houses cooler, the material should be marketed in areas that have high temperatures.

Explanation:

Answer: number 2 I think is d all of the above

Explanation: the teacher explained it to the class that.

1). C

2). D

3). B

4). A

5). D

6). B

7). C

8). A

9). B

10). B

Answer:

The mechanical advantage of the system is equal to 19.62

Explanation:

The ratio of the force produced by a machine to the force applied to it is called mechanical advantage. In other words it is the ratio of output force to the input force.

In this problem mass=200kg

applied force=100N  

input force=100N

output force=[tex]mg=200 \times 9.8=196N.[/tex]

mechanical advantage [tex]MA= \frac{1960}{100}=19.6[/tex]

It gives an idea about the efficiency of a mechanical device. It is indeed a measure of force amplification. In block and tackle system an assembly of ropes and pulleys is used to lift loads. When the moving block is supported by a  greater  number of rope sections the force amplification will be more.

Answer:

19.6

Explanation:

MA=Ouput/Input

To get output value multiply; 200 (which is the mass) * 9.8 (which is gravity)

So, 200*9.8=1960N

Input is 100 because that is the force you are putting into the bag

Back to our formula MA=Output/Input, enter in our values...

MA=1960/100

Now divide 1960/100=19.6

MA=19.6

(no units; they cancel out).

Final answer:

Sound waves, as mechanical waves, need a medium to travel and are affected by its properties, while light waves, which are electromagnetic, can travel through a vacuum. When light travels through media of different densities, it experiences changes in speed, leading to refraction and reflection, changing brightness and color perception.

Explanation:

Light and sound waves are fundamentally different in how they interact with various media they travel through. Sound waves are mechanical waves meaning they require a medium like air, liquid, or solid to travel. The density and elasticity of these media affect the speed and quality of sound, with denser media generally allowing faster sound transmission. Also, movements in the medium, such as wind, can also influence the speed and direction of sound waves.

On the other hand, light waves, being electromagnetic waves, do not require a medium and can travel through a vacuum. However, when they pass through different media, their speed can vary. In denser media, light waves slow down which can lead to phenomena such as refraction (bending of the light) or reflection. The changes in speed and direction make light interact with objects differently, often affecting the brightness and color as perceived by the observer.

Answer:

A scientist examines the results and answers the lab question.

Also in the conclusion write down what you learned from the experiment.

Answer:

the dude above me is right

Explanation:

he right

Answer:

Redshift and blueshift show how light shifts to shorter or longer wavelengths as objects in space move closer of farther away from us. People looking at an object that is moving away from them see light that has a longer wavelength than it had when it was produced (a redshift), while people looking at an source coming closer see light that is shifted to shorter wavelength (a blueshift).

Answer:

Vertical position of the rock after 2 seconds = 11.46 m

Horizontal position of the rock after 2 seconds = 13.06 m

Explanation:

Initial height = 25 m

Angle of throw = 25 degrees

Velocity of throw = 7.2 m/s

Horizontal velocity of throw = 7.2 cos 25 = 6.53 m/s

Vertical velocity of throw = 7.2 sin 25 = 3.04 m/s

Acceleration in horizontal direction = 0 m/s²

Acceleration in vertical direction = -9.8 m/s²

Vertical position of the rock at t = 2 seconds

We have equation of motion s = ut + 0.5at²

                                     s = 3.04 x 2 - 0.5 x 9.81 x 2²

                                     s = -13.54 m

Vertical position = 25 - 13.54 = 11.46 m

Horizontal position of the rock at t = 2 seconds

We have equation of motion s = ut + 0.5at²

                                     s = 6.53 x 2 + 0.5 x 0 x 2²

                                     s = 13.06 m

Horizontal position = 13.06 m

Vertical position of the rock after 2 seconds = 11.46 m

Horizontal position of the rock after 2 seconds = 13.06 m