Answer:
The 10 kg mass would have to be at a height 3 times that of the 30 kg mass to have the same gravitational potential energy as the 30 kg mass.
Explanation:
Gravitational potential energy, U = mgh where m = mass of object, g = acceleration due to gravity = 9.8 m/s² and h = height of object above the ground.
Now, let U' = gravitational potential energy of 10 kg mass = m'gh' where m' = 10 kg and h' = height of 10 kg mass above the ground.
So, U' = 10gh'
Also, let U" = gravitational potential energy of 30 kg mass = m"gh" where m" = 30 kg and h" = height of 30 kg mass above the ground.
So, U" = 30gh"
Since both object are supposed to have the same potential energy at a given height of the 10 kg mass,
U' = U"
10gh' = 30gh"
h' = 30gh"/10g
h' = 3h"
So, the 10 kg mass would have to be at a height 3 times that of the 30 kg mass to have the same gravitational potential energy as the 30 kg mass.
An oven consumes 425 kWh of energy in order to provide 386 kWh of useful energy. What is its percent efficiency?
Answer:
90.8%
Explanation:
efficiency = output / input
Simply just put in what we know.
386/425 = 0.908 (Rounded too 3 s.f)
And if you want this in percentage, you simply x100 your answer. Hence the answer being 90.8%
a car accelerates along a straight road from rest to 75km/h in 5.0s. What is the magnitude of its average acceleration? show up solutions
Answer:
4.186 m/s^2
Explanation:
First, convert km/hr to m/s:
(75 km/hr)(1000m/1km)(1hr/60min)(1min/60s) = 20.83 m/s
Then, divide 20.93 m/s by 5.0s
(20.93 m/s) / (5.0s) = 4.186 m/s^2
The 59 converted into binary is _____.
How do we convert number to binary?
Answer:
111011
Explanation:
59/2 = 29, remainder is 1
29/2 = 14, remainder is 1
14/2 = 7, remainder is 0
7/2 = 3, remainder is 1
3/2 = 1, remainder is 1
1/2 = 0, remainder is 1
A current of 2.5A flows through a simple electrical
circuit. How many coulombs of charge flow through
a point in 2 minutes?
I need help with this please
Answer:
300 coulombs.
Explanation:
We know that:
Current(A) = quantity of charge (coulomb) / time(secs)
But we are looking for the charge. So we do this:
Quantity of charge = Current (A) × Time (secs)
2 mins = (60 × 2) secs = 120 secs
2.5A × 120 secs = 300 coulombs
Which type radiation can be observed well from Earth's surface?
Answer:
Eletromagnetic radiation which is also known as visible light.
Explanation:
Answer:
Gamma Ray's as they have the shortest wavelength and highest frequency in the electromagnetic Spectrum.
Which diagram correctly represents the electric field lines between two small electrically charged spheres?
Answer:
hehe
Explanation:
The direction of electric field in the two small charged sphere can be outward if both are positive and inward if both are negative.
Direction of electric field in a charged sphereThe direction of electric field in a charged sphere can be inward or outward. The electric field will point inwards for a negatively charged sphere and outward for a positively charged sphere.
The type of charge at the center of the sphere will determine the direction of the electric field.
Thus, the direction of electric field in the two small charged sphere can be outward if both are positive and inward if both are negative.
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define equation of motion
Answer:
In physics, equations of motion are equations that describe the behaviour of a physical system in terms of its motion as a function of time.
There are 5 types of equations of motion:
[tex]v = u + at[/tex] (Velocity) [tex]v =[/tex] final velocity [tex]v^{2} = u^{2} + 2as[/tex] (Velocity squared) [tex]u =[/tex] initial velocity [tex]s = ut + \frac{1}{2} at^{2}[/tex] (Displacement with positive acceleration) [tex]a=[/tex] acceleration[tex]s = vt - \frac{1}{2} at^{2}[/tex] (Displacement with negative acceleration) [tex]t=[/tex] time[tex]s=\frac{1}{2} (u+v) t[/tex] (Displacement) [tex]s=[/tex] displacement (vector version of distance)
The lamps in circuit drawn below are all identical, Each of the cells have a potential difference of 1.5 volts What is the potential difference across the 3 cells that are joined in series
Answer:
4.5V
Explanation:
In a arrangement of cells, the cells could be joined end to end(series) or to a common junction (parallel).
When cells are joined in series, the total emf of the cell is the sum of the individual emf of all the cells.
Hence;
Total emf = 1.5V + 1.5V + 1.5 V = 4.5 Volts
a branch falls from a tree.how fast is the branch moving after 0.28 seconds?
2.75 m/s. Hope this helps.
An object accelerating at 16 m/s/s doubles its mass and triples its net force acting on it. What will the new acceleration be? (Just number no units)
Answer:
24 m/s²
Explanation:
The given parameters are;
The initial acceleration of the object, a = 16 m/s²
Let 'm' represent the initial mass of the object
The initial force acting on the object, F = m × a
∴ F = 16 × m = 16·m
When the mass is doubled, we have;
The new mass of the object, m₂ = 2 × m = 2·m
When the net force acting on the object triples, we have;
The new net force acting on the object, F₂ = 3 × F = 3 × 16·m = 48·m
From F = m × a, we have;
a = F/m
∴ The new acceleration of the object, a₂ = F₂/m₂
From which, by plugging in the values, we have;
a₂ = 48·m/(2·m) = 24
The new acceleration of the object, a₂ = 24 m/s².
1. Mineral in the earth's crust exists naturally in form of solid elements or compounds *
True
False
Answer:
True
Explanation:
Minerals can be defined as any form of naturally occurring, inorganic solid substance characterized by a crystal structure. Also, minerals are homogeneous in nature with a defined chemical composition and characterized by a crystal structure comprising of ions, atoms, or molecules in an orderly arrangement.
Generally, molecules attach on the inside of a mineral to give it shape. Therefore, the molecule of a mineral is a crystal three-dimensional regular structure (arrangement) of chemical particles that are bonded together and determines its shape.
Furthermore, the chemical composition (property) of a mineral reflect the presence and arrangement of atoms in each.
Due to the fact that these molecules are structurally arranged (ordered) and are repeated by different symmetrical and translational operations, they determine the shape of minerals. Some examples of minerals are iron, copper, aluminum, tin, coal, quartz, feldspar, mica, etc.
Additionally, inorganic-crystalline solid substances which are found naturally within earth are referred to as minerals.
In conclusion, a mineral in the earth's crust exists naturally in form of solid elements or compounds.
Suppose a ball is thrown vertically upwards from a position P above the ground. It rises to the highest point Q and returns to the same point P. What is the ball's net displacement and the distance traveled?
Answer:
Net displacement = 0
Distance traveled = 2PQ <_up and down
Explanation:
What causes an atom to be radioactive??
Answer:
What causes atoms to be radioactive? ... Instability of an atom's nucleus may result from an excess of either neutrons or protons. A radioactive atom will attempt to reach stability by ejecting nucleons (protons or neutrons), as well as other particles, or by releasing energy in other forms
(5 pts) If the object can reach a speed of 2m/s, what
is its kinetic energy? (If you don't have a scaler,
estimate the mass of the object in kg)
KE= | mv2
Answer:
[tex] = \frac{1}{2} m {v}^{2} \\ = \frac{1}{2} \times m\times {2}^{2} \\ = 2m \: joules[/tex]
The element radon is at the opposite end of the range, with the lowest specific heat of all naturally occurring elements. Radon's specific heat is 94 J/kg°C. If the
temperature of a 0.34 kg sample of radon is to be raised by 25°C, how much energy will have to be added to the radon?
Explanation:
Q = mc∆T
= (0.34 kg)(94 J/kg-°C)(25°C)
= 799 J
Johnny pushes on a wall with a force of 75N for one hour. Is there work being done? (Explain in simple words please lol . But fr tho SOMEBODY HELPP I CANT FAIL THIS)
Answer:
No, work isn't being done by Johnny.
Explanation:
Work can be defined as the energy transferred to a physical object by exertion of a force on the object to cause a displacement of the object. Thus, work is typically done when a person or simple machine move an object over a distance through the application of a force.
Mathematically, work done is given by the formula;
Work done = force * distance
[tex] W = F * d[/tex]
Where,
W is the work done
F represents the force acting on a body.
d represents the distance covered by the body.
In this scenario, Johnny's push didn't cause a displacement of the wall and as such no work is done.
Part B: Explain why the cardboard would be a better item than the jump rope for
modeling the cell wall of a plant cell. (5 points)
The cardboard would be able to act as a better cell wall since it can act more closely to an actual cell wall. A cell wall has layers and covers the plant cells in order to protect it. The cardboard can cover it more with its layers rather than the jump rope.
The cardboard would be a better item than the jump rope because the cardboard would be able to act as a better cell wall since it can act more closely to an actual cell wall. The cardboard can cover it more with its layers rather than the jump rope.
What is a plant cell?A plant cell is a eukaryotic cell that contains a true nucleus and certain organelles to perform specific functions. However, some of the organelles present in plant cells are different from other eukaryotic cells.
What is the composition of a plant cell wall?The cell wall of a plant is made up of cellulose. Cellulose is a long, linear polymer of several glucose molecules.
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Sample Response: Yes, the law of conservation of momentum is satisfied. The total momentum before the collision is 1.5 kg • m/s, and the total momentum after the collision is 1.5 kg • m/s. The momentum stays the same after the collision. What did you include in your response? Check all that apply. The law of conservation of momentum is satisfied. The momentum before the collision is 1.5 kg • . The momentum after the collision is 1.5 kg • . The momentum is the same after the collision as it was before the collision.
Answer:
All options presented were applied to the answer.
Explanation:
The sample response presented in the question above, refers to a closed system where two molecules after colliding satisfy the conservation of momentum law, which can also be called the conservation law of linear momentum. This law states that in a closed system the initial state of the components must be maintained and remain the same until the final state, that is, the two molecules maintain their ideal momentum before and after the collision. This means that if they had 1.5 kg • m/s before the collision, this value must be maintained after the collision. All these concepts are presented in the sample response.
Answer:
What did you include in your response? Check all that apply. The law of conservation of momentum is satisfied. The momentum before the collision is 1.5 kg • m/s. The momentum after the collision is 1.5 kg • m/s. The momentum before and after the collision is the same.
Explanation:
The sample response presented in the question above, refers to a closed system where two molecules after colliding satisfy the conservation of momentum law, which can also be called the conservation law of linear momentum. This law states that in a closed system the initial state of the components must be maintained and remain the same until the final state, that is, the two molecules maintain their ideal momentum before and after the collision. This means that if they had 1.5 kg • m/s before the collision, this value must be maintained after the collision. All these concepts are presented in the sample response.
If you lift a 80 N book 50 cm off the floor, how much work did you do?
1. 0
2. 4000 J
3. 40 J
4. 1.6 J
A man pushes a couch a distance of 0.75 m. If 450 J of work is done, what is the magnitude of the force applied?
1. 16.9 J
2. 45
3. 1350 J
4. 2700 J
Aslaam 3lekm m3akm yaseen my 8nat alninkm
What can you drop of liquid Mercury be described as?
For an object to appear red, what must happen?
A. It must refract red light waves.
B. It must diffract red light waves.
C. It must reflect red light wavel
D. It must shift red light waves.
Answer:
C. It must reflect red light wavelExplanation:
The color of the object is reflected by the object other colors are absorbed by the object.
Here object appears in red color so red color is reflected by the object and other colors are absorbed.
Your little sister (mass 25 kg) is sitting in her little red wagon (mass 8.5 kg) at rest. You begin pulling her forward, accelerating her with a constant force for 2.35 s to a speed of 1.8 m/s. Calculate the Impulse you imparted to the
wagon and its passenger
As the wagon is been pulled forward with a constant force, the impulse Impulse imparted to the wagon and the little girl is 60.3kg.m/s
Given the data in the question;
Mass of little sister; [tex]m_s =25kg[/tex]Mass of wagon; [tex]m_w = 8.5kg[/tex] time; [tex]t = 2.35s[/tex]Since the wagon was originally at rest, Initial velocity; [tex]u = 0m/s[/tex]Final velocity; [tex]v = 1.8m/s[/tex]Impulse is the force applied for certain amount of time which results in change in momentum.
[tex]I = M( v-u )[/tex]
To determine the impulse you imparted to the wagon and its passenger.
Total mass[tex]M = ( m_s + m_w) = ( 25kg + 8.5kg ) = 33.5kg[/tex]
So, we substitute our given values into the equation
[tex]I = 33.5kg(\ 1.8m/s\ -\ 0m/s\ )\\\\I = 33.5kg \ *\ 1.8m/s \\\\I = 60.3kg.m/s[/tex]
Therefore, as the wagon is been pulled forward with a constant force, the impulse Impulse imparted to the wagon and the little girl is 60.3kg.m/s
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name one advantage and one disadvantage of the prepaid electricity system.
Answer:
The system prevents a consumer from accruing debt via electricity use, as it only allows the customer to use electricity which has been paid for upfront.
this gives the advantage of not allowing the consumer to rack up debt
the disadvantage for the consumer comes when they cannot afford to prepay in a time of financial difficulty - as the system now renders them as having no electricity as well as no money
Can anybody help?? If somebody can answer I'd love it!!
Answer:
1.
a. T
b. F
c. T
d. F
e. T
2. Liquid, gas, solid
3. Water
4.
a. Solid
b. Gas
c. Water
5.
a. Add heat
b. Remove heat
c. Add heat
What is the speed of light in (a) crown glass n= 1.52, (b) Lucite n = 1.51, and (c) ethyl alcohol n = 1.36?
Answer:
[tex](a)\\1.97\times 10^8 m/s\\(b)\\1.99\times 10^8 m/s \\(c)\\2.21 \times 10^8 m/s[/tex]
Explanation:
According to the definition of refractive index, the refractive index of the material is defined as the ratio of speed of light in vacuum to the speed of light in medium.
(a) refractive index, n = 1.52
[tex]n=\frac {c}{v}\\\\1.52 = \frac{3\times 10^8}{v}\\\\v = 1.97\times 10^8 m/s[/tex]
(b) refractive index, n = 1.51
[tex]n=\frac {c}{v}\\\\1.51 = \frac{3\times 10^8}{v}\\\\v = 1.99\times 10^8 m/s[/tex]
(c) refractive index, n = 1.36
[tex]n=\frac {c}{v}\\\\1.36 = \frac{3\times 10^8}{v}\\\\v = 2.21\times 10^8 m/s[/tex]
A professional driver raced 400 meters in 8.56 seconds. If the driver started at rest and had a constant acceleration throughout the race, What was the acceleration of the car?
Answer:
10.92 m/s²
Explanation:
Applying,
s = ut+at²/2.................... Equation 1
Where s = distance. u = initial velocity, t = time, a = acceleration.
From the question,
Given: s = 400 meters, t = 8.56 seconds, u = 0 meters/seconds (Starts from rest)
Substitute these values into equation 1
400 = 0(8.56)+a(8.56²)/2
400 = 73.2736a/2
73.2736a = 800
a = 800/73.2736
a = 10.92 m/s²
Physical characteristics can be transmitted from generation, from parents to offspring. The passage of genetic Instructions from one generation to anther is known as which of the following?
A. Heredity
B. Chromosomes
C. DNA
D. Genes
Answer:
A. HeredityExplanation:
Heredity is defined as the passage of genetic instructions from one generation to the next.
I WILL MARK U BRAINLIEST IF YOU ANSWER
BLUEBLACK COLOR IS FORMED WHEN STARCH AND IODINE IS MIXED .
Amy put some salt in a weighing dish. Then she put the weighing dish on a sensitive balance to measure the mass of the salt. She removed the weighing dish from the balance and put it in several similar balances. She recorded the mass each time. Mass 1 Mass 2 Mass 3 Mass 4 Masse 5 5.608 g 5.607 g 5.608 g 5.608 g 5.609 g Amy forgot to subtract the mass of the empty weighing dish from her measurements, and she reported the mass of the salt as 5.608 grams. Amy's measurement of the salt's mass accurate because . Amy's measurement of the salt's mass precise because .
Answer:
Explanation:
i. Accuracy in measurement is a term that is used to describe the closeness of a measured value to its actual value. It relates the actual value to the measured values.
Therefore in the given question, Amy's measurement of the salt's mass is accurate because her final value is close to all the measured values.
ii. Precision in measurement is a term that is used to describe the closeness of different measured values to each other. It relates the keenness in the measured values.
Thus, Amy's measurements of the salt's mass is precise because the values of the masses are close to one another.
what is netwon first law of motion
Answer:
Newton’s first law of motion states that there must be a cause—which is a net external force—for there to be any change in velocity, either a change in magnitude or direction. An object sliding across a table or floor slows down due to the net force of friction acting on the object.
Explanation:
