According to the Newton's second law, which of the following is TRUE about a person pushing a lawn mower? А The net external force applied by the person is the push plus friction exerted on a lawn mower. B The force exerted by the person pushing the mower must be less than the friction opposing the motion. С The direction of the acceleration is the same direction as that of the net force, which is parallel to the ground. D The direction of the acceleration is the same direction as that of the force of friction, which is parallel to the ground.
Answer:
The correct option is;
C. The direction of the acceleration is the same direction as that of the net force, which is parallel to the ground
Explanation:
Newton's second law of motion states that the acceleration which a net force on an object produces has a magnitude that is directly proportional to that of the magnitude of the net force, and the direction of the acceleration is the same as that of the net force that produces it.
Therefore, given that the net force which tends to push the lawn mower across the grass acts parallel to the ground, the direction of the is in the same direction of the net force, moving parallel the ground.
One of the following statements is incorrect. (a) The car traveled around the circular track at a constant velocity. (b) The car traveled around the circular track at a constant speed. Which statement is incorrect and why?
Answer:
A
Explanation:
It is deemed to be incorrect because velocity deals with displacement. Or in more simple terms, distance in a specified direction.
While moving round the track, the direction keeps changing, so to say and the velocity vector changes constantly.
Speed on the other hand, is a scalar quantity that doesn't bother about nor depends on the direction being taken by the car.
that's all, I hope you understand it all
Can someone help me with this?
Answer:
1- origin
2- y coordinate
3- y axis
4- x axis
5- x coordinate
Explanation:
I NEED THIS IN AN HOUR! PLEASE PLEASE PLEASE HELP Tim and Jim measured the length of the same piece of board. Using a certain ruler, Tim obtained a length of 0.96 centimeter. Using a different ruler, Jim obtained a length of 0.9662 centimeter. Which measurement is better? Explain the reason for your answer.
Answer:
Jims is better
Explanation:
His number is more complex which means it is more accurate
A runner changing speed from 3 meters per second to 5 meters per second is an example of
Answer: acceleration
Explanation:
he is accelarting from 3 meters per second to 5 meters per second
Answer:
acceleration
Explanation:
What are the measurements that are used to
describe movement?
Answer: The SI unit
Explanation: The SI units are used to describe the distance an object moves
Why is there no ideal time of day when all students should study?
Answer:because each individual works best at a different time of day. D. because scheduling prevents everyone from studying at a set time. emilleexo818 is waiting for your help.
Explanation:
Answer:
The correct and overall question would be: Because each individual works best at a different time of day
Explanation:
(I'm smart and I took the quiz, I hope this helped guys! :)
Small blocks A and B are held at rest on a smooth plane inclined at 30° to the horizontal. Each is held in equilibrium by a force of magnitude 18 N. The force on A acts upwards parallel to a line of greatest slope of the plane, and the force on B acts horizontally in the vertical plane containing a line of greatest slope (see diagram). Find the weight of A and the weight of B.
First of all, See the attachment for better understanding[tex].[/tex]
_________________________________
❂ Weight of block A :
➝ mg sin30° = 18
➝ W (1/2) = 18
➝ W = 18×2
➝ W = 36N
❂ Weight of block B :
➝ N sin30° = 18
➝ (Mg cos30°) sin30° = 18
➝ W' (√3/2)(1/2) = 18
➝ W' (√3/4) = 18
➝ W' = 72/√3
➝ W' = 41.61N
There is a species of bamboo that can grow 36 inches per day. If a plant grew at this rate and was measured at 40 inches initially, how long (in days) would it take for the plant to grow to a height of 200 inches tall?
Answer:
It will take the plant [tex]4\frac{4}{9}[/tex] days or 4.44 days to grow to a height of 200 inches tall.
Explanation:
From the question, the rate at which the species of the bamboo tree grows is 36 inches per day.
To determine how long it would take a plant 40 inches tall initially to grow at this rate (that is, 36 inches per day) to a height of 200 inches.
This means we will calculate the number of days it will take the plant to grow additional 160 inches ( 200 inches - 40 inches) at this rate.
Now,
If the plant grows 36 inches in 1 day
then it will grow 160 inches in x days
x = (160 inches × 1 day) / 36 inches
x = 160 / 36
x = [tex]4\frac{4}{9}[/tex] days or 4.44 days
Hence, it will take the plant [tex]4\frac{4}{9}[/tex] days or 4.44 days to grow to a height of 200 inches tall.
A baseball is thrown horizontally at 46 m/s. The ball slows down at a rate of 5 m/s2. How long
is the ball in the air before coming to rest?
Answer:
9.2 sExplanation:
Using one of the equation of motion v = u + at where;
v is the final velocity = 0m/s (the ball comes to rest after throw)
u is the initial velocity = 46m/s
a is the acceleration = -5m/s² (the body decelerates)
t is the time taken by the ball in air
substituting the given parameters into the formula to get t, we will have;
0 = 46 +(-5)t
0 = 46 - 5t
subtract 46 from both sides
0-46 = 46-5t-46
-46 = -5t
Divide both sides by -5
-46/-5 = -5t/-5
t = 46/5
t = 9.2seconds
Hence it will take the ball 9.2seconds in the air before coming to rest.
Answer: 9.2sec
Explanation. 9.2sec
Machines
A pulley system having 5 pulleys is used to
raise a 450 N load. Find the Mechanical
advantage and hence the effort if the
efficiency is 75%.
Explanation:
Hey there!!
Here, Given is,
Efficiency = 75%
VR = no. of pulleys = 5
Now,
[tex]effeciency = (\frac{ma}{vr} ) \times 100\%[/tex]
[tex]75\% = \frac{ma}{5} \times 100\% [/tex]
100% ma = 75%×5
[tex]ma = \frac{75\% \times5}{100\%} [/tex]
[tex]ma = \frac{375\%}{100\%} [/tex]
Therefore, MA is 3.75.
Hope it helps...
Answer:
MA=3.75
Explanation:Given that, E=75%, VR=no. of pulley=5
NOW,
E=(MA/VR)*100%
75%=(MA/5)*100%
MA=(75%*5)*100%
MA=375%/100%
∵MA=3.75
Determine the acceleration (in m/s) of an object which
A. changes its velocity from 12.1 m/s to 23.5 m/s in 7.81 seconds
B. accelerates from 33.4 m/s to 18.9 m/s over a distance of 109 m
C. accelerates from 21.5 m/s to 8.9 m/s over a distance of 109 m
Please help!
Explanation:
A=23.5-12.1/7.81
1.46
b)(18.9^2-(33.4)^2)/2(109)
-3.5
c)8.9^2-(21.5)^2/2(109)
-1.76
Energy flow in an ecosystem is best represented by
a. the predator/prey relationship
b. food chains
C. food webs
d. autotrophs
Answer:
It's actually C. food webs
Explanation:
took the test
Answer: c
Explanation:
edge 2020
Convert 300 K into the celsius scale
Convert 220 °C into kelvin scale.
Convert 30 °C into fahrenheit scale
Convert 260 °F into °C.
Answer:
26.85 Celsius.
493.15 Kelvin
86F
26.85
493.15
Tk=Tc+273.15
The height of a model rocket h(t) is a function of the time since it was launched t
Answer:
0 [tex]\leq[/tex] t [tex]\leq[/tex] 40
Explanation:
Apex :)
There is a hot iron nail and a liter of boiling water. Which one has heat energy? Why?
Guys plz answer it fast
Answer:
Boiling Water.
Explanation:
Because there is still kinetic energy in the water. Thus it has heat energy.
Which phrase is the best definition of matter
Answer:
Matter
Explanation:
Any type of material is a matter. It can be anything that occupies space and have mass. It is a composition of atoms which in term is made up of electrons, protons and neutrons. All particles in our universe is matter because everything has some mass and it occupies space.
Answer:
Anything that has mass and occupies space
Explanation:
Just took the test
when we increase the exponent 10 to 10 we must
Answer:
If you say it like this (x^10)^10, then it would be x^100.
Oil dropping down the inner side of a tube confirms amine. This is what analysis ?
Answer:Qualitative
Explanation:
Phylis Physics travels a displacement of 2.50 km north followed by 4.30 km south and then 1.40 km north. What is her final displacement? What total distance did she travel?
Answer:
Her final displacement is 0.4 km North
Her total distance is 8.2 km
Explanation:
Given;
initial position, = 2.5 km north
then 4.3 km south
final position = 1.4 km north
let northward direction = positive direction
let southward direction = negative direction
The final displacement = 2.5 km North - 4.3 km South + 1.4 km North
The final displacement = -0.4 km North
Thus, the magnitude of the final displacement = 0.4 km North
In distance, the direction of the motion is not considered
The total distance = 2.5 km + 4.3 km + 1.4 km
The total distance = 8.2 km
Two students want to determine if the acceleration of an object in free fall depends on the mass of the object. They conduct the following experiment to investigate this question: They drop a balled up sheet of paper (0.005 kg), a notebook (0.4 kg), and their physics book (5 kg) from a height of one meter. If air resistance is ignored, which of the following best predicts which object will experience the greatest acceleration?
Answer:
All the objects experience the same acceleration
Explanation:
According to Newton's law of universal gravitation, we have the gravitational force F given by the relation;
[tex]F=G \times \dfrac{M_1 \times m_{2}}{R^{2}}[/tex]
Where;
G = The universal gravitational constant
M₁ = The mass of the Earth
m₂ = The mass of the object in the Earths gravitational field
R = The radius of the Earth
Therefore, we have;
[tex]F= m_2 \times a = G \times \dfrac{M_1 \times m_{2}}{R^{2}}[/tex]
Which gives;
[tex]a = G \times \dfrac{M_1 }{R^{2}} \ which \ is \ a \ constant = 9.80665 \ m/s^2, \ known \ as \ g, \ which \ is \ \\the \ (acceleration \ due \ to \ gravity)\\[/tex]Therefore, based on the above calculation, all three object will have the same acceleration due to gravity, g, when air resistance is ignored.
A liquid thermometer can be used to test for fevers. When body temperature increases,
the liquid inside the thermometer expands and rises to show a higher temperature reading. Which of the following explanations below best describes the
changes in thermal energy of the particles during this specific example of heat transfer?
A. The thermometer tip is heated by radiation from the person's body. The particles of the thermometer tip then transfer heat by convection through the
liquid inside of it. The particles inside the liquid then convect heat causing the warmer particles to slow down, expand, and rise.
OB. The thermometer tip is heated by conduction from the person's body. The particles of the thermometer tip then transfer heat by convection through the
liquid inside of it. The particles inside the liquid then convect heat causing the warmer particles to slow down, expand, and rise.
OC. The thermometer tip is heated by convection with the person's body. The particles of the thermometer tip then transfer heat by conduction with the
liquid inside of it. The particles inside the liquid then conduct heat causing the warmer particles to speed up, expand, and rise.
O D. The thermometer tip is heated by conduction with the person's body. The particles of the thermometer tip then transfer heat by conduction with the liquid
inside of it. The particles inside the liquid then convect heat causing the warmer particles to speed up, expand, and rise.
hey m
Answer:A
Explanation:
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A liquid thermometer can be used to test for fevers. When body temperature increases, the liquid inside the thermometer expands and rises to show a higher temperature reading, the explanation that describes the change in the thermal energy,
The thermometer tip is heated by conduction with the person's body. The particles of the thermometer tip then transfer heat by conduction with the liquid inside of it. The particles inside the liquid then convect heat causing the warmer particles to speed up, expand, and rise.
What is thermal energy?It can be defined as the form of the energy in which heat is transferred from one body to another body due to their molecular movements, thermal energy is also known as heat energy.
Conduction with the subject's body heats the thermometer's tip. The liquid inside the thermometer is subsequently heated by conduction between the particles of the thermometer tip. The warmer particles then accelerate, expand, and ascend as a result of the heat convecting through the liquid's particles.
Thus, the correct answer is option D.
Learn more about thermal energy from here
brainly.com/question/3022807
#SPJ2
Solving with the Speed equation: v= d/t
(add to notes if desired)
3. Juan has ridden his bike a total distance of 20 km. If his average speed was 15km/h,
how much time did he ride for?
a)
What is given in the problem? (Circle)
b) What are we trying to find? (Square)
What will be the units to our solution?
d) Plug into the speed equation and solve.
Answer:
Explanation:
time= distance/speed
20km/ 15km/h
= 1 1/3 hours (4/3 in mixed fraction)
An airplane flies 700 miles with a tail wind in 2.0 hrs. If it takes 2.5 hrs to cover the same distance against the headwind, then what is the speed of the plane in still air? A).290mph B).315mph C).240mph D).330mph E).250mph
Answer:
B).315mph
Explanation:
Let the speed of the plane = p
Let the speed of the wind = w
Set up the system equation as;
Relative V: Time: Distance:
in wind direction: p + w 2 700
against wind: p - w 2.5 700
2(p + w) = 700
2.5(p - w) = 700
2p + 2w = 700
2.5p - 2.5w = 700
2.5 x: 5p + 5w = 1750
2 x: 5p - 5w = 1400
10p = 3150
p = 315 mph
Therefore, he speed of the plane in still air is 315 mph
Who is the father of nuclear physics?
Answer: the father of the nuclear physics is Ernest Rutherford
Explanation:
A modified Atwood machine is at rest. The hanging block has a mass of 3kg. The black on wheels has unknown mass M1. When released the block m2 falls at 5.88m/s^2. If frictional forces are considered so small they are negligible, the block M1 must have a mass of _______ kg.
Answer:
From the figure,
The free-body diagrams for and are shown in the figures below. The only forces on the blocks are the upward tension and the downward gravitational forces and . Applying Newton’s second law, we obtain:
which can be solved to yield
Substituting the result back, we have
(a) With and , the acceleration becomes
(b) Similarly, the tension in the cord is
When one type of energy changes to another type of energy *
A. constant
B. energy conservation
C. energy transformation
D. Other:
Answer:
Energy transfer is the movement of energy from one location to another. Energy transformation is when energy changes from one type to another. While energy can be transferred or transformed, the total energy always remains the same.
Explanation:
Ed records the temperature of two pots of water. Pot X
has a temperature of 56 degrees Fahrenheit, and pot Y
has a temperature of 49 degrees Fahrenheit.
Answer is “ the water in pot x has more kinetic energy than the water in pot y”
Answer:
B on edgen
Explanation:
The water in pot X has more kinetic energy than the water in pot Y.
Answer:
the water in pot x has more kenetic energy.
Explanation:
not sure if its the answer. just found it on quizlet.
Push-ups and lifting weights are good examples of what type of physical activity?
Bone Strengthening Activities
O Muscle Strengthening Activities
Aerobic Activities
Answer:
I think it would be muscle
Explanation:
bones strengthened by calcium
aerobics is more of a gymnastical exercise
leaving a muscle strengthen
Answer:
Technically all 3
Explanation:
Include activities that make their hearts beat faster, build muscles (like climbing or doing push-ups), and strengthen bones (like running or jumping).
Traditional pushups are beneficial for building upper body strength. They work the triceps, pectoral muscles, and shoulders. When done with proper form, they can also strengthen the lower back and core by engaging (pulling in) the abdominal muscles. Pushups are a fast and effective exercise for building strength.Jun 22, 2018
Aerobic exercise (also known as cardiovascular exercise) builds your endurance. Anaerobic exercise typically means activities such as weightlifting and push-ups and sit-ups, which builds muscle and physical strength through short bursts of strenuous activity.
HELPPPP PLSSSS A group of students is investigating whether air resistance depends on the size of an object. The students throw two paper pieces each with the same force. One piece of paper is flat and the other is scrunched into a ball. The distance traveled by each paper piece is shown. Experimental Observations Student 1 Student 2 Student 3 Student 4 Distance traveled by flat paper 0.2 m 1.2 m 1.5 m 0.8 m Distance traveled by scrunched paper 1.5 m 2.4 m 3 m 2 m What was the test variable (independent variable) in this experiment? A.Distance traveled by flat paper B.The shape of the paper C.Distance traveled by scrunched paper D.The number of students
Answer:
Explanation: societal law is A statement about how things act in the natural world. the wire and electro magnet need to touch in question 2. a decrease in spee decreases kinetic energy. the test variable was the distance traveled by the scrunched paper.
Answer:
B
Explanation:
The shape is the only thing that changes.