Answers
Answer:
it looks like B on the first one and D on the second hope this helps!!
Explanation:
Related Questions
A cell phone weighing 80 grams is flying through the air at 15 m/s. What is its kinetic energy
Answers
Answer:
The kinetic energy of the cell phone is 9J
Explanation:
The kinetic energy is the energy possessed by a body by virtue of motion.
The kinetic energy is expressed as
KE= 1/2m(v)²
Given data
Mass of cell phone m= 80g--to kg=80/1000= 0.08kg
Velocity of cell phone v= 15m/s
Substituting our given data we have
KE= 1/2*0.08(15)²
KE= (0.08*225)/2
KE=18/2
KE= 9J
(b)
On what factor does the mechanical advantage of a simple machine depend?
(a) N/m
B.
Very short answer questions,
1.
What is the principle of simple machine?
2.
3.
The efficiency of simple machine is 75%. What does it mean?
4.
S.
What is lever?
In how many classes is lever classified?
Write the name of a simple machine used to change the direction of force.
6.
0
Reliant Science - 9
Answers
Answer:
B. 1. The factors on which the mechanical advantage depends are the load, the effort, the distance moved by the load and the distance moved by the effort
2. The principle of a simple machine is the conversion of the direction and magnitude of a force input into one or more outputs of a either a different magnitude, or direction or both
3. A 75% efficiency of a simple machine means that the power of the frictional force is one quarter of the power of the input force
4. A lever is a simple machine that consists of a fulcrum over (or under) which a rigid beam can be applied
5. There are three classes of lever
6. A pulley
Explanation:
B. 1. For simple machines, we have the Ideal Mechanical Advantage, IMA, given as follows;
[tex]IMA = \dfrac{F_r}{F_e} = \dfrac{d_e}{d_r}[/tex]
Where;
[tex]F_r[/tex] = The resistance force (The load)
[tex]F_e[/tex] = The effort force
[tex]d_e[/tex] = The distance moved by the effort
[tex]d_r[/tex] = The distance the load is moved
Therefore, the factors on which the mechanical advantage depends are the load, the effort, the distance moved by the load and the distance moved by the effort
2. The principle of a simple machine is the conversion of the direction and magnitude of a force input into one or more outputs of a either a different magnitude, or direction or both
3. The mechanical efficiency of a simple machine, η, can be expressed as follows;
[tex]\eta =\dfrac{P_{out}}{P_{in}}[/tex]
Where;
[tex]P_{out}[/tex] = The power at output
[tex]P_{in}[/tex] = The input power
[tex]P_{in}[/tex] = [tex]P_{out}[/tex] + [tex]P_{friction}[/tex]
[tex]P_{friction}[/tex] = The frictional force's power
Therefore, an efficiency of 75% means that we have;
[tex]P_{out}[/tex] = η × [tex]P_{in}[/tex] = 0.75 × [tex]P_{in}[/tex] = 0.75·[tex]P_{in}[/tex]
From which we have;
[tex]P_{in}[/tex] = [tex]P_{out}[/tex] + [tex]P_{friction}[/tex] = 0.75·[tex]P_{in}[/tex] + [tex]P_{friction}[/tex]
∴ [tex]P_{friction}[/tex] = [tex]P_{in}[/tex] - 0.75·[tex]P_{in}[/tex] = 0.25·[tex]P_{in}[/tex]
Therefore, 75% efficiency of a simple machine means that the power of the frictional force is 0.25 × (or one quarter of) the power of the input force
4. A lever is a simple machine that consists of a fulcrum over (or under) which a rigid beam can be applied
5. There are three classes of lever
(a) First class lever (b) Second class lever and (c) Third class lever
6. A pulley
A pulley acts by lifting a load upward from a downward applied force.
Explanation:
B. 1. The factors on which the mechanical advantage depends are the load, the effort, the distance moved by the load and the distance moved by the effort
2. The principle of a simple machine is the conversion of the direction and magnitude of a force input into one or more outputs of a either a different magnitude, or direction or both
3. A 75% efficiency of a simple machine means that the power of the frictional force is one quarter of the power of the input force
4. A lever is a simple machine that consists of a fulcrum over (or under) which a rigid beam can be applied
5. There are three classes of lever
6. A pulley
Explanation:
B. 1. For simple machines, we have the Ideal Mechanical Advantage, IMA, given as follows;
IMA = \dfrac{F_r}{F_e} = \dfrac{d_e}{d_r}IMA=
F
e
F
r
=
d
r
d
e
Where;
F_rF
r
= The resistance force (The load)
F_eF
e
= The effort force
d_ed
e
= The distance moved by the effort
d_rd
r
= The distance the load is moved
Therefore, the factors on which the mechanical advantage depends are the load, the effort, the distance moved by the load and the distance moved by the effort
2. The principle of a simple machine is the conversion of the direction and magnitude of a force input into one or more outputs of a either a different magnitude, or direction or both
3. The mechanical efficiency of a simple machine, η, can be expressed as follows;
\eta =\dfrac{P_{out}}{P_{in}}η=
P
in
P
out
Where;
P_{out}P
out
= The power at output
P_{in}P
in
= The input power
P_{in}P
in
= P_{out}P
out
+ P_{friction}P
friction
P_{friction}P
friction
= The frictional force's power
Therefore, an efficiency of 75% means that we have;
P_{out}P
out
= η × P_{in}P
in
= 0.75 × P_{in}P
in
= 0.75·P_{in}P
in
From which we have;
P_{in}P
in
= P_{out}P
out
+ P_{friction}P
friction
= 0.75·P_{in}P
in
+ P_{friction}P
friction
∴ P_{friction}P
friction
= P_{in}P
in
- 0.75·P_{in}P
in
= 0.25·P_{in}P
in
Therefore, 75% efficiency of a simple machine means that the power of the frictional force is 0.25 × (or one quarter of) the power of the input force
4. A lever is a simple machine that consists of a fulcrum over (or under) which a rigid beam can be applied
5. There are three classes of lever
(a) First class lever (b) Second class lever and (c) Third class lever
6. A pulley
A pulley acts by lifting a load upward from a downward applied force.
A brick, milk, and ice cubes are all examples of matter.
Answers
true because
brick: solid
milk: liquid
ice cube: solid
pressure exerted on a surface depends on________
(a) force and pressure
(b) density and area
(c) height and density
(d)Area and density of liquid
Answers
Answer:
(a) Force and Pressure
Explanation:
Acc to the formula,
Force = Pressure/Area
Therefore it depends on force and pressure
Question 4
1 pts
What is the mass of a rock sitting on a 10 meters high cliff if it has a potential energy of 500
joules?
50 kg
10 kg
5 kg
1000 kg
Answers
Answer:
it's answer is 5 kg
hope it helps youAnswer:
5kg is your answer
I hope it helps mate
I will always help you understanding your assingments
have a great day
I am bored
#Captainpower:)
Two charged objects originally felt 12N of attraction. One charge is changed from to 3C to 6C and their distance changes from 15cm apart to 45cm apart. What is the new force of attraction ?
Answers
Given that,
Initial force, F = 12 N
First initial charge, q₁ = 3C
First new charge, q₁' = 6C
Initial distance, r = 15 cm
New distance, r' = 45 cm
To find,
The new force of attraction.
Solution,
The force between two charges is given by :
[tex]F=k\dfrac{q_1q_2}{r^2}[/tex]
[tex]12=k\dfrac{3\times q_2}{15^2}\ ....(1)[/tex]
Let F' is the new force.
[tex]F'=k\dfrac{q_1'q_2'}{r'^2}[/tex]
[tex]F'=\dfrac{k\times 6\times q_2}{(45)^2}\ ...(2)[/tex]
As q₂ is same in this case.
Dividing equation (1) and (2) :
[tex]\dfrac{F}{F'}=\dfrac{k\dfrac{3q_2}{15^2}}{\dfrac{k\times 6\times q_2}{45^2}}\\\\\dfrac{12}{F'}=4.5\\\\F'=\dfrac{12}{4.5}\\\\F'=2.67\ N[/tex]
So, the new force of attraction is 2.67 N.
A wire of resistance R is cut into ten equal parts which are then connected in parallel. The equivalent resistance of the combination is
Answers
Answer:
The equivalent resistance of the combination is R/100
Explanation:
Parallel Connection of Resistances
If resistances R1, R2, R3,...., Rn are connected in parallel, the equivalent resistance is calculated as follows:
[tex]\displaystyle \frac{1}{R_e}=\frac{1}{R_1}+\frac{1}{R_2}+\frac{1}{R_3}+...+\frac{1}{R_n}[/tex]
The electric resistance of a wire is directly proportional to its length. If a wire of resistance R is cut into 10 equal parts, then each part has a resistance of R/10.
It's known the 10 parts or resistance R/10 were connected in parallel, thus the electric resistance is:
[tex]\displaystyle \frac{1}{R_e}=\frac{1}{R/10}+\frac{1}{R/10}+\frac{1}{R/10}+...+\frac{1}{R/10}[/tex]
Note the sum consists of 10 equal terms. Operating on each term:
[tex]\displaystyle \frac{1}{R_e}=\frac{10}{R}+\frac{10}{R}+\frac{10}{R}+...+\frac{10}{R}[/tex]
The sum of 10 identical fractions yields 10 times each fraction:
[tex]\displaystyle \frac{1}{R_e}=10\frac{10}{R}=\frac{100}{R}[/tex]
Solving for Re needs to take the reciprocal of both sides of the equation:
[tex]R_e=R/100[/tex]
The equivalent resistance of the combination is R/100
Which of the following would result in the greatest gravitational force between the two objects?
A. two astronauts on a space walk that are 10 meters apart
B. two mosquitoes 0.25 meters apart flying around your head
C. two oxygen atoms separated by 1 meter inside of a hot air balloon
D. two massive blocks of concrete that are 1 meter apart floating in deep space
Answers
Answer:
i think b
Explanation:because they are so close
A mass of 630g is hung on a spring. Using Force = mass x gravity, what is the force of the mass, acting on the spring?
Answers
Answer:
6.174N or roughly 6.2N
Explanation:
630g=0.63kg
F=m*g=0.63*9.8=6.174N
magnetic field strength decrease when what is increases
Answers
Susan makes the following entry in her notebook: “On Friday we were given a blue liquid in a shallow container. We placed it on the windowsill over the weekend. On Monday morning, there was no liquid left, but the dish had some solid blue stuff in it.”
a. Was the blue liquid in the dish a heterogenous mixture, a solution, or a pure substance? Explain your choice.
b. Write a few sentences about what you think happened in the dish.
Answers
Answer:
Explanation:
a. From the information provided in the question, the blue liquid is a solution. This is because a solution is a type of homogeneous mixture (that has an evenly distributed solute in a solvent) which is the reason the liquid was said to be blue (and not immiscible blue solid in a liquid) but after been exposed to heat became just a blue solid. Typically, a solution has a solute and a solvent (combined), the solute here is the blue solid while the solvent is the liquid that made the combination a liquid.
b. Since the dish containing the liquid was placed on a windowsill, it can be assumed that the dish was subjected to heat from the sun which caused the liquid (in the solution) to evaporate after exposure to the heat from the sun (over the weekend) leaving the blue solid solute (of the solution) to remain in the dish. This can be referred to as evaporation to dryness in separation techniques (if the goal was to intentionally separate the solid solute from the liquid solvent).
1. Identify the phase or phases of matter (solids, liquids, and gases) that
apply to each statement. More than one phase of matter may apply to each
statement.
a. Molecules do not move around, but vibrate in place
b. Has volume but no particular shape
c. Flows
d. Molecules break free of intermolecular forces
e. Does not have a volume or shape
f. Molecules can move around and switch places, but remain close
together
Answers
Answer:
a: solid
b: liquid
c: liquid
d: gas
e: gas
f: liquid
Explanation:
According to the forces of attraction, the states of matter in each case serially are as follows: solid, liquid,liquid,gas,gas and liquid respectively.
What is matter?Matter in chemistry, is defined as any kind of substance that has mass and occupies space that means it has volume .Matter is composed up of atoms which may or not be of same type.
Atoms are further made up of sub atomic particles which are the protons ,neutrons and the electrons .The matter can exist in various states such as solids, liquids and gases depending on the conditions of temperature and pressure.
The states of matter are inter convertible into each other by changing the parameters of temperature and pressure.Matter can neither be created nor destroyed rather is conserved at end of chemical change.
Learn more about matter,here:
https://brainly.com/question/12972782
#SPJ2
What units would you use to measure a virus (nanometers micrometers millimeters)
Answers
nanometers
to measure a virus you use nanometers
how would something make more energy in order to travel farther and faster
Answers
Answer:
hit it harder
Explanation:
Endicott Kendrick
answer please in comment what i am typing
Answers
Answer:
Hiiiiiiii........where r u frm??
What is osomsis and diffusion
Answers
Answer:
Osmosis is the movement of solvent particles across a semipermeable membrane from a dilute solution into a concentrated solution. ... Diffusion: Diffusion is the movement of particles from an area of higher concentration to lower concentration. The overall effect is to equalize concentration throughout the medium.
Does anyone know the answer
Answers
Why aren’t all the islands of Hawaii the same age?
Answers
Answer:
The age trend of the volcanoes is thought to be due to the way in which the islands are built on the moving sea floor of the North Pacific Ocean: the Pacific Ocean is mostly floored by a single tectonic plate (known as the "Pacific Plate") that is moving over the layer in the Earth known as the Asthenosphere
Explanation:
Question 1 of 11
What are two ways space exploration can improve international relations?
DA By urging countries to compete to achieve goals
DB. By helping countries' economies grow weaker
DC. By encouraging countries to share scientific data
DD. By inspiring countries to work together to solve problems
Answers
AnswerC and D
Explanation:
Answer: C & D
Explanation: Aplex
The form of energy stored in food is known as
Answers
Answer: This form of energy is called Chemical Energy. Hope this helped!
what material would you use to build countertops
Answers
Answer: Natural stone
Explanation:
Answer:
Natural stone
Explanation:
The most common natural stones used to make countertops include granite, marble, soapstone, and slate.
How are the energy conversions of machines similar to the energy conversions in your body
Answers
Answer:
Explained below
Explanation:
When we eat food, our body gets chemical energy from it. Now, this chemical energy from the food is changed into some different energy forms that is useful to it. They include:
-Chemical to mechanical energy to aid in movement of muscles
- chemical to thermal energy to aid in regulating the body temperature.
- chemical to electrical energy to aid the brain in thinking.
Thus is similar to how a machine converts energy because machines also generate energy after being powered and convert to other forms of energy. For example, an alarm clock converts electrical energy to sound energy, hair dryer converts electrical energy to thermal/heat energy.
Which of the following improves your range of motion and helps prevent
injuries?
A. A healthy body composition.
B. Strong flexibility.
C. Strong cardio-respiratory endurance.
D. A good sense of balance.
Answers
Hooke's Law Question - Will mark brainliest
A spring of natural length 10cm and spring constant 4.00Ncm −1 has a load of 22.0N placed on it. What is its new length?
Answers
Explanation:
Hooke's Law: Fe = kx
x = Fe / k = (22.0N) / (4.00N/cm) = 5.50cm.
10.00cm + 5.50cm = 15.50cm
The new length of the spring is 15.50cm.
Select the correct answer.
Which diagram represents an object in equilibrium?
ОА.
applied
force = 20 N
force due to
friction = 15 N
OB.
applied
force = 20 N
force due to
friction = 20 N
OC.
applied
force = 15 N
force due to
friction = 25 N
OD.
applied
force = 30 N
force due to
friction = 20 N
ОЕ.
applied
force = 30 N
force due to
friction = 15 N
Reset
Next
My
Answers
Answer:
B
Explanation:
The force and friction cancel each other.
20N - 20N = 0N acting on the object.
YALL PLS HELP ME! CAN YOU GUYS CHECK MY ANSWERS?
Answers
Answer:
1. Newton's First Law of Motion
2.Newton's Third Law of Motion
3.Newton's Third Law of Motion
4.Newton's Second Law of Motion
5.Newton's Third Law of Motion
6.Newton's Second Law of Motion
7.Newton's First Law of Motion
Explanation:
Newton's First Law of Motion states that an object remain at rest or moving with a uniform velocity unless an external force acts on it. This is the law of inertia
Newton's Second Law of Motion states that the force of an objects is the product of mass and acceleration.
Newton's Third Law of Motion states that when two objects interact, a pair of forces act on the objects, and they are equal and act in opposite directions.
H+ H+He
A. alpha decay
B. beta decay
C. nuclear fusion
D. nuclear fission
Help
Answers
Answer:
c. nuclear fusión oh A. alpha decay
an iron rod of length 100m at 10 degree Celsius is used to measure a distance of 2km on a day when the temperature is 40 degree Celsius. Calculate the error in measuring the distance
Answers
Answer:
0.68 m
Explanation:
α = dL / L1*(dT)
dL = L1(dT) * α
Initial length, L1 = 100
Chang in Length =dL
α linear expansivity ; dL = change in length ; dT = change in temperature ; L1 = initial length
α of iron rod = 1.13 * 10^-5 k
dL = 100(40 - 10) * 1.13 * 10^-5
dL = 100(30) * 1.13 * 10^-5
dL = 3000 * 1.13 * 10^-5
dL = 3390 * 10^-5
dL = 0.0339 m
Error :
Distance measured = 2km = (2 * 1000) = 2000m
[Distance measured / (initial length + change in length)] × change in length
Error = (2000 / (100 + 0.0339)) * 0.0339
Error = (2000 / 100.0339) * 0.0339
Error = 19.993222 * 0.0339
Error = 0.6777702
Error = 0.68 m
A boxer pushes on a 25 kg heavy bag which is attached to the ceiling until it makes an angle of 36 degrees to the vertical. How much force must the boxer exert on the bag?
Answers
Answer:
198.20 N
Explanation:
Given that,
Mass of a heavy bag, m = 25 kg
The bag is attached to the ceiling until it makes an angle of 36 degrees to the vertical.
We need to find the force must the boxer exert on the bag. The force acting on the bag is given by :
[tex]F=mg\cos\theta\\\\=25\times 9.8\times \cos(36)\\\\=198.20\ N[/tex]
So, the required force is 198.20 N.
25 POINTS!!!
Copy this concept map, and then use vocabulary terms from the previous page to complete the concept map.
VOCAB
Mechanical wave
Electromagnetic wave
Transverse wave
Longitudinal wave
Frequency
Amplitude
Refraction
Radio wave
Infrared wave
Ultraviolet wave
Transparent
Translucent
Opaque
Intensity
Compression
Rarefaction
Pitch
Decibel