A 15 kg mass is lifted to a height of 2m. What is gravitational potential energy at this position

Answers

Answer 1

Answer: 294J

Explanation:

[tex]U_g=mg(y_f-y_i)[/tex]

[tex]U_g=(15)(9.8)(2-0)=294J[/tex]

Answer 2

Answer:

294.3 J

Explanation:

U = mgh

U = energy

m = mass

g = gravity

h = height

so

U = 15kg * 9.81 m/s^2 * 2m

294.3 J (joules) [kg *m^2/s^2]


Related Questions

A Drive to the BeachMary drove from her home to the beach that is 30 mi from her house. The first 15 mi she drove at 60 mph, and the next 15 mi she drove at 30 mph. Would the trip take more, less, or the same time if she traveled the entire 30 mi at a steady 45 mph

Answers

Answer:

Explanation:

Let us calculate the average velocity .

Average velocity = total distance / total time

Time taken to drive first 15 mi

= 15 / 60 = .25 h

Time taken to drive next 15 mi

= 15 / 30 = .5 h

Total time = .25 + .5 = .75 h

Total distance = 30 mi

average speed = 30 / .75

= 40 mi / h

So average speed is 40 mph which is less than given velocity of 45 mph .

Hence if she travels at 45 mph , she will take less time .

.What is the relationship between the solar radius and the brightness of stars?

Answers

Answer:

Its radius is thought to be around 1400 times than of our sun, and its luminosity 270,000 greater than our sun. Also, if a star has the same radius as the sun but a higher surface temperature, the hotter star exceeds the sun in luminosity

Explanation:

As the solar radius of the star increases, the brightness of the star also increases.

What is meant by luminosity ?

Luminosity is defined as the measure of brightness of a celestial object or the relative quantity of light.

Here,

Solar radius is a unit of distance, which is used to determine the size of the stars relative to the sun.

The size of the star and the luminous intensity are directly proportional. As the size of the star increases, the luminosity of the star also increases. Therefore, larger stars shine more brighter than the smaller ones.

The brightness of a star is directly proportional to the square of its solar radius. Therefore, the luminosity increases with increase in solar radius.

Hence,

As the solar radius of the star increases, the brightness of the star also increases.

To learn more about luminosity, click:

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Select all the correct locations on the image.
Which hot spots identify features in the image that can help lower the effects of urbanization?

Answers

Answer:

its the top 3 can confirm on plato

Explanation:

Answer:

plato

Explanation:

What happens to ar object in free fall?​

Answers

Energy from the gravitational potential store in converted to kinetic energy. Air friction acts against the object, dissipating some energy as heat or sound. The object will continuously accelerate until the acceleration is equal to the air friction acting against it. This is when it reaches terminal velocity


This circuit has more than one loop. When one light goes out, the
others stay on.
A.open circuit
B.series circuit
C.parallel circuit
D.closed circuit

Answers

Answer:

Parallel circuit

Explanation:

A parallel circuit has a direct current allowing it to go back and forth making it have more pathways and loops. if one light bulb goes out the pathways will allow the electricity to still flow inti the other light bulbs.

A physicist attempts to use Newton's laws of motion to predict the behavior of a molecule of water, but the laws fail to give accurate predictions. What is the most likely reason?


A) Liquids do not follow the laws of motion.


B) The molecule is small enough so that quantum effects are important.


C) Newton’s laws apply to atoms, but not to molecules.


D) The molecule was likely traveling at a near-light speed.

Answers

Answer:

B) The molecule is small enough so that quantum effects are important.

Explanation:

The molecules of water behave like wave and their motion cannot be accurately predicted by classical physics laws but can be properly predicted by quantum theory.

Classical physics describes matter that behave like solid particles while quantum effect describes matter that behaves like waves.

Therefore, the correct option is B.

9. What is the magnitude of the velocity of a 25 kilogram mass that is moving with a
momentum of 100 kilogram-meters per second? [Neglect friction] Round your
answer to the nearest tenths place.

Answers

Answer:

4

Explanation:

The momentum of the object is 100 kgm/s, therefore the magnitude of the velocity of the object is 4 meters per second.

What is Momentum?

Momentum of an object is the product of its mass and velocity. Momentum is the quantity of motion which is made up of the amount of matter which is being moved and the velocity at which the object moves. When we walk, run, etc., then we have momentum.

p = m × v

where, p is the momentum of the object,

m is the mass of the object,

v is the velocity of the object

p = 100 kgm/s

m = 25 kg

p = m × v

v = p/m

v = 100/ 25

v = 4 m/s

Therefore, the magnitude of velocity of the object is 4 meters per second.

Learn more about Momentum here:

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The mass and weight of box is 25 Kg and 245 N respectively when on Earth. What is the value of mass and weight of the box when it is brought to the moon?

Answers

Answer:

25 (kg) and 40.5 (N).

Explanation:

1) the value of 'g' on the Earth is ~9.81 (N/kg), the value of 'g' on the Moon is ~1.62 (N/kg).

It means, the mass is not depended on the value of 'g', but the weight is depended on it.

2) the mass on the Moon is the same, 25 kg.

the weight is 25*1.62=40.5 N

So Fn = dº* p*g What would happen to the force (FN) if the size of each side of the cube were to double? d -> 2d​

Answers

Answer:

Fn=m(a + g) :

Explanation:

nf=a(m +g)

an=f(g+m)

Suppose you have a cylinder filled with diatomic oxygen (O2) and it is running low. The cylinder is shown above, is made of steel, and has a fixed volume of 10 L.

You are asked to determine the number of O2 molecules that are left in the cylinder, so you take a measurement of the temperature to be 20℃. You then note that the pressure gauge reads 100 psi, which you checked at sea level in Bellingham, where the local pressure is one atm (14.7 psi). Calculate the number of O2 molecules left in the container.

Answers

Answer:

The number of O₂ molecules that are left in the cylinder is 1.70x10²⁴.

Explanation:

The number of oxygen molecules can be found using the Ideal Gas law:

[tex] PV = nRT [/tex]        

Where:

P: is the pressure = 100 psi

V: is the volume = 10 L

n: is the number of moles =?

T: is the temperature = 20 °C = 293 K

R: is the gas constant = 0.082 L*atm/(K*mol)

Hence, the number of moles is:

[tex]n = \frac{PV}{RT} = \frac{100 psi*\frac{1 atm}{14.7 psi}*10 L}{0.082 L*atm/(K*mol)*293 K} = 2.83 moles[/tex]

Now, the number of molecules can be found with Avogadro's number:

[tex]n_{m} = \frac{6.022 \cdot 10^{23}\: molecules}{1\: mol}*2.83 moles = 1.70 \cdot 10^{24} \: molecules[/tex]

Therefore, the number of O₂ molecules that are left in the cylinder is 1.70x10²⁴.

I hope it helps you!              

What attitudes and actions can group leaders take in trying to establish trust within a group during the initial stage of group development? How is each attitude and action important in the process of initiating trust?​

Answers

Answer:

i dont know!

Explanation:

Could a sea breeze occur at night? Explain why or why not.

Answers

No sea breeze can not occur at night because while sea breezes occur during the day, land breezes occur at night. Despite the difference in times at which the land breezes and sea breezes occur, the reason for the land breeze's formation is basically the same as the sea breeze, but the role of the ocean and land is reversed.
Hope this helps ✌️

A spacecraft drifts through space at a constant velocity. Suddenly, a gas leak in the side of the spacecraft gives it a constant acceleration in a direction perpendicular to the initial velocity. The orientation of the spacecraft does not change, so the acceleration remains perpendicular to the original direction of the velocity. What is the shape of the path followed by the spacecraft in this situation

Answers

Answer: The path will be a parabola.

Explanation: The path is a parabola because the motion described is a projectile motion, in which an object thrown or projected is subjected only to the acceleration.

In this motion, velocity must be constant and horizontal and acceleration is perpendicular compared to the direction of the velocity. In these conditions, the path is a parabola and the motion is a projectile.

A capacitor and an electric source are both connected to a light bulb. If the power source is momentarily disconnected from the circuit, what will happen to the light bulb?

Group of answer choices

It will get brighter because the capacitor is providing more power than the electrical source.

It will no light because the electric source is the only thing required to power the bulb.

It will stay momentarily lit because the capacitor is supplying a voltage.

It will flash on and off because of the unstable power.

Answers

Answer:

It will no light because the electric source is the only thing required to power the bulb.

Explanation:

Atoms of which pair of elements will form ionic bonds in a compound?

A.
Ti and Ni
B.
Ti and O
C.
Cl and Br
D.
P and Cl

Answers

Answer:

Ti and O

Explanation:

It is what it is.

Answer:

B. Ti and O

Explanation:

A.P.E.X

if a=8i+j-2k and b=5i-3j+k what is the value of b X a

Answers

Distribute the product:

a×b = (8i + j - 2k) × (5i - 3j + k)

a×b = 8i × (5i - 3j + k) + j × (5i - 3j + k) - 2k × (5i - 3j + k)

a×b = (40 (i×i) - 24 (i×j) + 8 (i×k))

… … … + (5 (j×i) - 3 (j×j) + k×j)

… … … + (-10 (k×i) + 6 (k×j) - 2 (k×k))

Recall the definition of the cross product:

i×i = j×j = k×k = 0 (the zero vector)

i×j = k

j×k = i

k×i = j

and for any two vectors x and y, we have x×y = -(y×x).

So we have some cancellation and rewriting:

a×b = (40 (i×i) - 24 (i×j) + 8 (i×k))

… … … + (5 (j×i) - 3 (j×j) + j×k)

… … … + (-10 (k×i) + 6 (k×j) - 2 (k×k))

a×b = (-24k - 8j) + (-5k + i) + (-10j - 6i)

a×b = -5i - 18j - 29k

Then

b×a = -(a×b) = 5i + 18j + 29k

How much time will it take for a bug to travel 2 meters across the floor if it is traveling at 0.5 m/s?

Answers

4 seconds to travel 2 meters :)


A stone is dropped off of a 123 meter cliff and falls to the ground below. How long does it take for the stone to hit the ground

Answers

25.10 or 24.6m/s both answers are correct

Explanation:

firstly , divide the multiply with 2 and divide the result by acceleration due to gravity which is 9.8m/s or 10m/s

123*2=246

246/9.8 or 10

= 25.10 or 24.6m/s

Friction produces heat because it causes molecules to move faster and
have more energy.
True or false.

Answers

Answer:

True

Explanation:

Friction occurs because no surface is perfectly smooth. Even surfaces that look smooth to the unaided eye make look rough or bumpy when viewed under a microscope. You know that friction produces heat. That’s why rubbing your hands together makes them warmer. But do you know why? Friction causes the molecules on rubbing surfaces to move faster, so they have more energy. This gives them a higher temperature, and they feel warmer. Heat from friction can be useful. It not only warms your hands.

Convert the arc length of 6.86 radians into cycles.
Plz convert this for me people have been putting random comments

Answers

Answer:

1.092 cycles

Explanation:

We need to convert the arc length of 6.86 radians into cycles.

We know that,

1 radian = 0.1592 cycles

To convert 6.86 radians to cycles, we use unitary method.

6.86 radian = (0.1592 × 6.86) cycles

= 1.092 cycles

Hence, there are 1.092 cycles in 6.86 radians. Hence, this is the required solution.

se the following graph describing a motorcycle's motion to answer the question below.

Answers

I do not see a graph for it?

Which statement can be supported by using a position-time grap
O A negative slope results when an individual is moving away
O A horizontal line on the graph means the individual is moving
O A positive slope results when an individual is moving away fr
O The speed of an individual cannot be determined from this ty

Answers

Answer:

A negative slope results when an individual is moving away

Explanation:

Which factors affect the gravitational force between two objects?
-
distance and velocity
O mass and distance
O mass and weight
acceleration and weight
TELE

Answers

Answer:

Mass and distance

Explanation:

According to Newton’s law, “objects with greater mass have a stronger force of gravity between them.” And “objects that are closer together have a stronger force of gravity between them.” Both of them mean mass and distance. Therefore, the correct answer is mass and distance.

Answer:

mass and distance

Explanation:

mass, and distance. The force of gravity depends directly upon the masses of the two objects, and inversely on the square of the distance between them.

When one person shouts at a football game, the sound intensity level at the center of the field is 69.6 dB. When all the people shout together, the intensity level increases to 103 dB. Assuming that each person generates the same sound intensity at the center of the field, how many people are at the game

Answers

Answer:

there are 2188 people at the game

Explanation:

Given the data in the question;

we know that decibel is defined as; dB = 10log(l/l₀)

so if one produces an intensity l₁, it results in 69.6 dB

69.6 = 10log(l₁/l₀) ---- equ1

also. if x number of people produces this intensity, it result to 103 dB

103 = 10log(xl₁/l₀)

103 = 10( log(l₁/l₀) + log(x) )

103 = 10log(l₁/l₀) + 10log(x) ----- equ2

input equation 1 into to equation 2

103 = 69.6 + 10log(x)

10log(x) = 103 - 69.6

10log(x) = 33.4

divide both side by 10

log(x) = 3.34

x = [tex]10^{3.34}[/tex]

x = 2187.76 ≈ 2188

Therefore, there are 2188 people at the game

I need help with this, I can't figure it out.
Here is the link:
https://platform.breakoutedu.com/game/play/fun-in-the-sun-140559-XMWCQF1LPL

Answers

Answer:

Star, Triangle, Circle, Rhombus, Square.Left, Down, Right, Down, Up.2,3,2,4.L,O,O,K,I,N,G,F,L,Y.

Explanation: You're welcome ✓

Which is the MOST likely reason scientists are trying to find ways to get energy from more renewable
resources?
А
Renewable resources cost less to produce than
energy from nonrenewable resources
B
Renewable resources are easier to replace than
nonrenewable resources
C
Renewable resources create more power than
nonrenewable resources
D
Renewable resources put more pollution in the air than nonrenewable resources

Answers

The correct answer is A “renewable resources cost less to produce than energy from non renewable resources

a water tank holds water to the depth of the 80cm what is the pressure of the water of the tank​

Answers

Answer:

7976 Pascals significant figure= 7.9*10^3

Explanation:

formula of hpg = height*density*gravitational energy

.80*10*997=7976 pascals

A cube of wood with a side length of 1 meter is place in the water. It half of the wood sank under the water, find the mass of the wood. (density of water 1.0 × 103kg/m3)

Answers

Answer:

Volume of cube is equal to two times the weight of replaced water [tex]1000[/tex] Kg

Explanation:

Length of one side of cube is [tex]1[/tex] meter

Volume of cube [tex]= 1* 1* 1 = 1[/tex] cubic meter

Half of the wood sank

Hence, the volume of water replaced will be equal to half the volume of cube

Volume of water replaced [tex]= \frac{1}{2} = 0.5[/tex] cubic meter

Density of water [tex]1 * 10^3[/tex] kg/m3

Weight of water replaced

[tex]= 1 * 10^3 * 0.5\\= 500[/tex]Kg

Volume of cube is equal to two times the weight of replaced water

[tex]= 2* 500 = 1000[/tex] Kg

ELE Review questions
POSSIBLE POINTS: 3
Match the energy transformation sequence with the device it describes:
A hair dryer plugged into the wall
a
A hand crank generator emergency radio
A battery operated fan
11 CE to ELE
+ ELE to KE
:: KE to ELE
h
1
2
A Review

Answers

Answer:

1. ELE to KE = Electrical energy conversion to kinetic energy.

2. KE to ELE = kinetic energy conversion to electrical energy.

3. CE to ELE = chemical energy conversion to electrical energy.

Explanation:

The Law of Conservation of Energy states that energy cannot be destroyed but can only be transformed or converted from one form to another.

Some examples of energy are chemical energy, electrical energy, kinetic energy, sound energy, potential energy, light energy, etc.

The transformation of energy from one form to another are described below;

1. A hair dryer plugged into the wall: it involves the conversion of electrical energy to kinetic energy. The energy type present in the wall socket is electrical energy which powers the hair dryer to have kinetic energy i.e the energy possessed due to motion of hair dryer.

2. A hand crank generator emergency radio: it illustrates the conversion of kinetic energy to electrical energy. The hand crank generator possess kinetic energy as it is being wounded before it is then converted into electrical energy which powers the radio.

3. A battery operated fan: it illustrates the conversion of chemical energy to electrical energy. The cells present in battery possess chemical energy that is being converted into electrical energy to power the fan.

In a close system a gas with constant volume at 20C and pressure
1bar a heat is added to increase its temperature to 120C. Find the
new pressure
I

Answers

Answer:

6bar

Explanation:

According to pressure law;

P1/T1 = P2/T2

Given the following;

P1 = 1bar

T1  = 20oC

P2 = ?

T2 = 120oC

Substitute

1/20 = P2/120

20P2 = 120

P2 = 120/20

P2 = 6bar

Hence the new pressure will be 6bar

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