Answer:
370.3J
Explanation:
A 10 kg ball is rolled to the top of a hill 37 m high using 4000 J of work. How much energy was lost due to heat?
Step one:
given data
mass m= 10kg
height of the hill= 37m
work done= 4000J
Step two:
The quantity of energy loss due to heat is the same as the difference in the potential energy possed by the mass and the work done
PE= mgh
PE=10*9.81*37
PE= 3629.7J
Hence the energy loss is
= 4000-3629.7
=370.3J
8.
What quantities are needed to describe the position of a water fountain relative to where you are standing?
Answer:
D. the distance and direction to the water fountain
Explanation:
To describe the position of a water fountain relative to where one is standing, the distance and direction to the water fountain must be known.
This quantity is known as the displacement.
Displacement is a vector quantity with both magnitude and direction. To specify the magnitude of a displacement, we use the length of path and in this case the height or sometimes the distance. The direction attribute distinguishes distance from displacement The perfect quantity to solve this problem is the displacement and it specifies the distance of the path and the direction traveled.How would you find the horizontal net force for the free body diagram below
Subtract Fn from Fa
Add Ff from Fa
Subtract Ff from Fa
Add Fa and Fg
Answer:
Add Ff from Fa
Explanation:
Fnet = sum of all force
horizontal net force = Ff + Fa
How are points made in soccer ?
a- by kicking the ball into the goal net
b - by carrying the ball into end zone
c - by shooting the ball into the hoop
Answer:
a- By kicking the ball into the goal net
Explanation:
You cant pick the ball up so b is not the answer and there is no hoop so c is also not the answer. The answer is A
A physical property is a characteristic of a substance is one that _____.
A.) can be observed by changing it into a different substance
B.) is seen after changing it into a different substance
C.) can be observed without changing it into a different substance
D.) does not involve freezing or boiling the substance
Which of the following is true for sound waves?
They require a medium
They are unrelated to vibrations.
They can travel in a vacuum
They cannot travel through liquids
None of the above
Explanation:
Answer
λ α
f
1
Wave velocity = Wavelength × Frequency
Thus, we can say that wavelength is inversely proportional to the frequency.
FALSE - Only electromagnetic waves can travel through a vacuum; mechanical waves such as sound waves require a particle-interaction to transport their energy. There are no particles in a vacuum.
What can chemical formulas represent?
A.) mixtures
B.) elements
C.) compounds
D.) atoms
Answer:
A chemical formula identifies each constituent element by its chemical symbol and indicates the proportionate number of atoms of each element. In empirical formulae, these proportions begin with a key element and then assign numbers of atoms of the other elements in the compound, by ratios to the key element.
hope this helps you
9. A soft drink distibutor drove west 11 km from Minnehaha to Nut Plains. She then turned around and drove back east for 209 km to Dover
What distance did the soft drink dibutor travel
Distance
Answer:
220km
Explanation:
Given parameters:
Distance traveled from Minnehaha to Nut Plains = 11km
Distance traveled to Dover = 209km
Unknown:
The distance the soft drink distributor traveled = ?
Solution:
To solve this problem, we must understand that distance is the total length of path covered in a journey.
So;
Distance = 209km + 11km = 220km
The soft drink distributor covered 220km
Circle the correct word(s) in brackets to complete each sentence.
i) Hooke's Law works for ( springs only / all materials / some materials ).
ii) Hooke's Law only applies ( up to / over ) a certain force.
iii) The force at which Hooke's Law stops working for springs is
( higher / lower ) than
for most other materials?
Answer:
i) Hooke's Law works for some materials
ii) Hooke's Law only applies up to a certain force
iii) The force at which Hooke's Law stops working for springs is lower than for most materials
Explanation:
Hooke's Law of elasticity states that the deformation of an elastic material is proportional to the applied for small deformations
The law is applicable to elastic materials whose values of deformation or extension as well as the applied load or stress are expressible by a single real number
Hooke's Law is applicable when the force and the extension of the elastic material are proportional, at larger force, the elastic material is observed to expand more than as expected based on Hooke's Law
The nature of springs is such that its elastic limit is reached by a much lower force than for most materials. Therefore, Hooke's law stops working for springs at a lower force than for most materials.
What is included in the units of Velocity that make it different from speed?What is included in the units of Velocity that make it different from speed?
Answer:
Direction
Explanation:
Speed is a measure of the distance covered by a moving object relative to the time it takes. It is a scalar quantity and, hence, measured irrespective of the direction the object is moving.
Velocity, on the other hand, is the speed of a moving object in a particular direction. It is a vector quantity, meaning that the direction of the moving object is important.
Therefore, the difference in the unit of speed and velocity is direction. The direction must be included in the unit of velocity.
The question is in the photo.
Answer:
Mitochondria (animal) and Chloroplast (plant)
A 2.25kg solid sphere has a rotational inertia about its center
• of gravity of 1.52kg.m2. What is the radius of the sphere?
Answer:
r = 1.3m
Explanation:
The moment of inertia of a solid sphere can be expressed using the formula;
I = ⅖ mr²
Where;
I = moment (kgm²)
m = mass of the sphere (kg)
r = rotational radius of the sphere (m)
Based on the provided information in this question, I = 1.52 kgm², m = 2.25 kg, r = ?
1.52 = ⅖ × 2.25 × r²
1.52 = 0.4 × 2.25 × r²
1.52 = 0.9 × r²
1.52 = 0.9r²
r² = 1.52/0.9
r² = 1.688
r² = 1.69
r = √1.69
r = 1.3m
explain why in the construction of a lightning conductor one end is made into a sharp point
Answer:
A lightning conductor is made up of a sharp pointed metal (usually copper metal, as it is a very good conductor) connected directly to the ground. ... The lightning conductor is placed higher than the roof so that if lightning strikes, it strikes the conductor before it can reach the house.
Explanation:
A lightning conductor is made up of a sharp pointed metal (usually copper metal, as it is a very good conductor) connected directly to the ground. ... The lightning conductor is placed higher than the roof so that if lightning strikes, it strikes the conductor before it can reach the house.
20 points please helppp me I’m begging u this is due soon please come on ????? Anyone
Answer:
Gases are element .We can change the state of matter by the process of melting,evaporation,sublimation,freezing,condensation.
Juan y Pedro transportan una caja que pesa 120,00 Lb sobre una tabla uniforme de 12 pies de largo y peso de 44,5 Lb. El peso de 120 Lb está a 4,9 pies de Pedro. ¿Cuál es el módulo de la fuerza en Lb que debe ejercer Pedro por el extremo derecho de la tabla horizontal para sostener este peso?
Answer:
F = 93.25 lb
Explanation:
To solve this problem let's use the rotational equilibrium condition
Σ τ = 0
let's fix a reference system located at the end of the table, the position of Juan and assume the counterclockwise turns as positive
F_jhon 0 - w l / 2 - W (l-4.9) + F l = 0
F = w l / 2 + W (l -4.9) / l
where w is the weight of the table and W the weight of the box
let's calculate
F = (44.5 12/2 + 120 (12- 4.9)) / 12
F = 93.25 lb
A man walks 2.6 miles east, then turns and walks 6.7 miles north. What is his resultant
vector from start to finish?
Answer:
Yes cause he walks 6.7 miles
The displacement vector of the man is equal to 17.41 miles in the Northeast direction.
What is displacement?The displacement of an object can be defined as the shortest distance between two points. The displacement can be described as a vector quantity because contains both direction and magnitude. The displacement can be positive (+ve), negative, or zero and can change with time.
The distance is the total path traveled and is a scalar quantity as it has only magnitude, and no direction. The distance is always positive (+ve), it can never be equal to zero.
Given, a man moves 2.6 miles along AB in the East and then 6.7 miles North along BC.
The displacement (AC) of the man can be calculated by using Pythagoras' theorem:
AC² = AB² + BC²
AC² = (2.6)² + (6.7)²
AC² = 6.76 +44.89
AC = 17.41 miles
Therefore, the displacement vector of the man is 17.41 miles.
Learn more about displacement, here:
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Susie blows up a balloon. First, she places the balloon in a bucket of ice water. She observes the balloon. She then removes the balloon and places it into a bucket of hot water. She observes the balloon again.
1. Explain what Susie will observes when she puts the balloon in ice water.
2. Explain what Susie will observe when she puts the balloon in hot water.
1. When Susie puts the balloon in ice water, she will observe the contraction of the balloon.
2. When Susie puts the balloon in hot water, she will observe the expansion of the balloon.
What is Charles's law of gas?According to Charles' law, assuming the pressure is constant, the volume occupied by a fixed amount of gas is directly proportional to its absolute temperature. French physicist J.-A.-C. Charles initially proposed this empirical relationship.
1. When Susie puts the balloon in ice water, the temperature of the gas inside the balloon will decreases and according to Charles' law its volume also decreases. That's why, she will observe the contraction of the balloon.
2. When Susie puts the balloon in hot water, the temperature of the gas inside the balloon will increases and according to Charles' law its volume also increases. That's why, she will observe the expansion of the balloon.
Learn more about Charles's law here:
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An object of mass 8kg is attached to massless string of length 2m and swum with a tangential velocity of 3 what is the tension on the string
Answer:
36 N
Explanation:
If the object of mass, m = 8 kg is swung in a horizontal circle of radius, r = 2m = length of string with tangential velocity v = 3 m/s, the tension in the string is the centripetal force which is T = mv²/r
= 8 kg × (3 m/s)²/2 m
= 4 kg × 9 m/s²
= 36 N
The density of iron is 7.87 g/cm3. If an iron cannonball has a volume of 105 cm3
what is the mass of the ball?
the answer is 0.284 lb/in3
In a typical golf swing the club is in contact with the ball for about 0.0010 s. If the .045 kg ball experiences a force of 4000 N, what is the final velocity of the golf ball?
Answer:
v = 88.89 [m/s]
Explanation:
To solve this problem we must use the principle of conservation of momentum which tells us that the initial momentum of a body plus the momentum added to that body will be equal to the final momentum of the body.
We must make up the following equation:
[tex]F*t = m*v[/tex]
where:
F = force applied = 4000 [N]
t = time = 0.001 [s]
m = mass = 0.045 [kg]
v = velocity [m/s]
[tex]4000*0.001=0.045*v\\v=88.89[m/s][/tex]
If I start with an 30 gram sample of Plutonium-244, how many grams would be left of Plutonium-244 after 1 half life
Answer:
15 g
Explanation:
Given,
Plutonium-244 = 30 g
We have to find the gram of Plutonium-244 left after 1 half-life.
We know that the half-life of a radioactive isotope is constant. The half-life of a Radioactive isotope does not depend on the initial amount of isotope.
Now,
After 1 half-life
Plutonium-244 left = [tex]\dfrac{30}{2}[/tex]
= 15 g
Hence, 15 g of the Plutonium-244 will be left after 1 half-life.
Convert 9600 nm to pm:
Answer:
hsjdjdht
Explanation:
...
please halp
Please answer the following 3 questions with a 1 paragraph response:
Why is defense important in the game of basketball? What two ways can you play defense in basketball? What are the differences between the 2 different ways you can choose to play defense?
The two basic defenses in basketball are man-to-man, sometimes referred to as person-to-person in respect for the rise of women's basketball, and zone. Each basic defense has a number of variations.
HELP ASAP please.
Determine if each picture is a high or low tide.
Note: only ONE picture can be a high tide and only ONE picture can be a low tide!
Answer:
1st one low tide 2nd high tide
Characteristics we use to tell the difference between kinds of matter are called___ properties
Answer:
I believe it's called qualitative
Explanation:
Help plz i’ll mark branliest
Answer:
please give me BRAINLIEST Answer
Explanation:
10.0 210.0 ms2
5.0 25.0 ms2
15.0 215.0 ms2
Electrical energy is widely used among the various sources of energy...Justify
Answer:
Electricity is both a basic part of nature and one of the most widely used forms of energy. The electricity that we use is a secondary energy source because it is produced by converting primary sources of energy such as coal, natural gas, nuclear energy, solar energy, and wind energy, into electrical power.
A body initially moving with a speed of 20m/s covers a distance of 150m after 5 sec .What is the acceleration of the body?
Answer:
a=4m/s2
Explanation:
Vi= 20m/s
S=150 m
t= 5 sec
a=?
using 2nd equation of motion;
S= Vit+0.5at^{2}
putting values
150= (20)(5)+0.5(a)([tex]5^{2}[/tex])
150-100= 12.5a
50/12.5 =a
4m/s2=a
What does the atomic number of an atom tell us?
How much the atom weighs
The number of protons in the atom
Which column the element is in on the periodic table
The number of electrons it is likely to lose
Answer:
the number of protons in the atom.
Explanation:
Answer:
the number of protons in the atom
Explanation:
For maximum benefit, you should exercise 5-7 times a week for 60 minutes and your heart rate should be between _____________ of your max heart rate.
Answer:
60 to 80%
Explanation:
For maximum benefit, the heart rates during exercise regimes should be between 60 to 80% of an individual's maximum heart rate.
The maximum heart rate varies from individuals to individuals and largely depends on age. It is calculated by subtracting one's age from 220. For example, a person that is 40 years old would have a maximum heart rate of;
220 - 40 = 180 beats per minute.
Such a person's heart rates during exercises should be between 108 and 144 beats per minute for maximum benefits.
please help me I need to get this right