Answer:
45
Explanation:
The average speed of the train was 5.33 meter/second.
What is speed?Speed is distance travelled by the object per unit time. Due to having no direction and only having magnitude, speed is a scalar quantity With SI unit meter/second.
Given parameters:
Distance travelled by the train is: d = 80 meters.
Time taken by the train: t = 15 seconds.
Hence, the average speed of the train =
total distance travelled/total time taken
= 80 meters/ 15 seconds.
= 5.33 meter/second.
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The rebounder in basketball has a vertical leap (that is, the vertical movement of a fixed point on their body) of 106 cm .
Answer:
[tex]u = 4.56m/s[/tex]
[tex]T = 0.94s[/tex]
Explanation:
See comment for complete question
Given
[tex]h = 106cm[/tex] --- Height
Solving (a): The initial speed
To do this, we make use of the third equation of motion
[tex]v^2=u^2+2ah[/tex]
In this case:
[tex]v = 0m/s[/tex] --- final velocity at the maximum height
[tex]a = -g = -9.8m/s^2[/tex]
[tex]h = 106cm[/tex]
Convert height to metres
[tex]h = 1.06m[/tex]
Substitute these values in [tex]v^2=u^2+2ah[/tex]
[tex]0^2 = u^2 +2 *(-9.8) * 1.06[/tex]
[tex]0^2 = u^2 -20.776[/tex]
Collect Like Terms
[tex]u^2 =20.776[/tex]
Take the positive square root of both sides
[tex]u =\sqrt{20.776[/tex]
[tex]u = 4.55806976691[/tex]
[tex]u = 4.56m/s[/tex] --- approximated
Hence, the initial velocity is 4.56m/s
Solving (b): Time spent in the air.
This will be solved using the first equation of motion.
[tex]v = u + at[/tex]
Where:
[tex]v = 0m/s[/tex] --- final velocity at the maximum height
[tex]a = -g = -9.8m/s^2[/tex]
[tex]u = 4.56m/s[/tex]
So, we have:
[tex]0 = 4.56 - 9.8t[/tex]
Collect Like Terms
[tex]9.8t = 4.56[/tex]
Make t the subject
[tex]t = \frac{4.56}{9.8}[/tex]
[tex]t = 0.46530612244[/tex]
[tex]t = 0.47s[/tex] --- approximated
The above is the time it reaches the maximum height.
The time it stays in the air is:
[tex]T = 2t[/tex]
This gives:
[tex]T = 2*0.47s[/tex]
[tex]T = 0.94s[/tex]
in what way is Speed related to Kinetic Energy?
Answer:
It turns out that an object's kinetic energy increases as the square of its speed
Explanation:
A car moving 40 mph has four times as much kinetic energy as one moving 20 mph, while at 60 mph a car carries nine times as much kinetic energy as at 20 mph.
basiclly the faster the more impact it has when it suddenly stops or hit somthing
Will an object experience a greater force of gravity on the earth or moon? Why?
Answer:
Earth’s gravitational force is stronger
Explanation:
Earth’s gravitational force is stronger than the moon because of the presence of more massive objects in earth; on the flip side, the moon’s gravity is weaker than the earth due to smaller in size as compared to the earth. Earth gravity is denoted by g; conversely, moon gravity is denoted by gm
Answer: The greater an object's mass, the more gravitational force it exerts. So, to begin answering your question, Earth has a greater gravitational pull than the moon simply because the Earth is more massive. That's why the moon isn't pulled out of Earth's orbit by the gravity of larger planets or by the sun.
Explanation:
Calculate the change in gravitational potential energy
when a 1.5Kg box falls from a 2m shelf. Take
g=10N/Kg.
Answer:
30J
Explanation:
Given parameters:
Mass of box = 1.5kg
Height = 2m
Acceleration due to gravity = 10N/kg
Unknown:
Change in gravitational potential energy = ?
Solution:
The change in gravitational potential energy is given as:
ΔGPE = mgh
m is the mass
g is the acceleration due to gravity
h is the height
ΔGPE = 1.5 x 10 x 2 = 30J
Place the following into scientific notation...(.000635)
*
-List ten different waves that you encounter in everyday life. Be specific, don't just say "sound
waves," but say "the sound waves generated by my cat meowing."
-For each of the waves in your list, specify whether it is a "transverse" or "longitudinal" wave
(I just need random everyday examples)
Answer:
1.Radio waves from using your TV.
2. microwaves you are in satellites.
3.UV light waves come from sunlight
4.x ray waves used at the doctors office
5. infrared waves are in remote controls when sending signals.
I don't know if I can think of another 5 right now. but I hope this helps.
Vivian went on a bicycle trip through Germany with her family. One afternoon, she rode her bicycle along a long flat road at a constant speed for 24 kilometers (km). The ride took her 1.2 hours (h). At what speed did she ride her bicycle?
Answer:
20km/h
Explanation:
Given parameters:
Distance moved = 24km
Time = 1.2hrs
Unknown:
Speed of her ride = ?
Solution:
Speed is the distance covered per unit of time.
So;
Speed = [tex]\frac{distance}{time}[/tex]
Speed = [tex]\frac{24}{1.2}[/tex] = 20km/h
Why is self-esteem a false strategy for a theory of motivation ?
Which of the following is an English system unit of measure?
O A. meter
B. mile
O C. gram
OD. liter
The use of force to move an object is
.
How can an electric current produce a magnetic field
Answer:
When the compass is placed below the wire, and the electric current switched on, the needle deflects in the opposite direction. If an electric current is passed through a long coil of wire (a solenoid ) a magnetic field is produced which is the same shape as that of a bar magnet.
Explanation:
Answer:
a changing electric field creates a magnetic field.
Explanation:
if you have a circuit and you send AC current through (AC = Alternating current) so that the electrons move back and forth, they will create a changing electric field.
This produces a magnetic field (because that's what the universe does).
please help me on this, really fast
HELP I WILL GIVE BRAINLYEST!!
The diagram below shows three parts labeled A, B, and C, of Earth's orbit around the Sun.
Which of these best arranges the parts of the orbit from fastest to slowest speed of Earth in them? (3 points)
Group of answer choices
C → B → A
A → B → C
B → C → A
A → C → B
Question 2
is art good?
Answer:
A-B-C
Explanation:
Depends if you have good taste.
what must be true the number of chromosomes in each sex cell
Answer:
In humans, each cell normally contains 23 pairs of chromosomes, for a total of 46.
High exposure to which type of electromagnetic radiation can cause genetic
mutations?
A. Ultraviolet
B. Visible light
C. Microwaves
D. Infrared
Answer:
A. Ultraviolet
Answer: A.Ultraviolet
Explanation:
just did it
Gracie chases the Frisbee for a displacement of 4.35 m while traveling 6.35 m/s. For how much time was Gracie running?
Answer:
2.34
Explanation:
Answer:
2.34
Explanation:
Hope this helps! :D
Change the following back to a standard number... (3.15 x 10-3)
please answer I will give brainleist
Help! I don’t really know what it’s asking
What happens to water molecules when a large quantity of thermal energy is added to water in the liquid state?
A car accelerates in the +x direction from rest with a constant acceleration of a1 = 1.51 m/s2 for t1 = 20 s. At that point the driver notices a tree limb that has fallen on the road and brakes hard for t2 = 5 s with a constant acceleration of a2 = -5.03 m/s2. Write an expression for the car's speed just before braking.
Answer:
v = 1.51t and v = 30.2 m/s just before braking
Explanation:
Using v = u + at where u = initial velocity of car = 0 m/s (since it starts from rest), a = a1 = acceleration before braking = 1.51 m/s², t = t1 = time before braking = 20s and v = speed of car before braking.
Substituting the values of the variables into the equation, we have
v = u + at
v = 0 m/s + 1.51 m/s²t
v = 1.51t and its value after 20 s is
v = 1.51 × 20
v = 30.2 m/s which is the value just before braking.
Which is larger, 12 kilometers or 7.5 miles? Show you’re work plz ASAP!!!!!
Answer:
there are just a bit over 1.6 km in a mile so 7.5*1.6=12. something so there is just a little bit more distance in 7.5 miles
Explanation:
A 400 hp engine in a 1,600 kg car applies maximum force for 2 seconds to accelerate the car onto the
interstate. If the car moves at 8 m/s before accelerating, what is its speed after the 2 seconds of acceleration?
Answer:
I will assume that “maximum force” implies the constant application of power P = 400 hp (international) to accelerating the vehicle. The force will therefore vary with speed as the vehicle accelerates. I will also assume that all engine energy goes into accelerating the vehicle, rather than rotating elements like its wheels.
In this case the 400 hp (equivalent to 298,280 watts) is applied for time t = 2 seconds. Therefore the kinetic energy of the vehicle is increased by:
ΔKE=Pt=(298,280)(2)=596,560 joules.
The initial kinetic energy is:
KEinitial=12mv2
=(0.5)(1600)(82)=51,200 joules.
Therefore final kinetic energy is:
KEfinal=KEinitial+ΔKE
=51,200+596,560
=647,760 joules
Therefore final vehicle velocity can be found:
KEfinal=12mv2
v=2KEfinalm−−−−−−−−√
=(2)(647,760)1600−−−−−−−−−−−√
= 28.455 m/s
Explanation:
You get out of school and walk north for 20 minutes. You travel
1.6 km. What is your average velocity?
What is the
Answer:
[tex]\boxed {\boxed {\sf v= 0.08 \ km/min \ North}}[/tex]
Explanation:
Velocity is found by dividing the displacement by the time.
[tex]v=\frac{s}{t}[/tex]
where s is the displacement and t is the time.
The displacement is 1.6 kilometers, but it needs a direction as well. The question notes you walked North. The time is 20 minutes.
[tex]s= 1.6 \ km \ North \\t= 20 \ min[/tex]
[tex]v=\frac{1.6 \ km \ North} { 20 \ min}[/tex]
Divide.
[tex]v= 0.08 \ km/min \ North[/tex]
Velocity is a vector quantity, so that is why it has the measurement and the direction.
The average velocity is 0.08 kilometers per minute North.
Answer:
Are there no moderators here?
Who are moderators here?
Well, the above answer is correct..
✨
pls help i’ll give brainliest if you give a correct answer!!
Answer:
applied force since she is pushing the box
maybe, I'm not 100% sure
Using humor can be strategic to stop bullying when it is hapoingjng true or false
in which phenomenon does light act as particles
Answer:
blackbody
Explanation:
A plate has an area of 1m square. It slide down an incline plane , having an angle of inclined 60° to horizontal, which a velocity of 0.75m/s. The thickness of oil film between the plate and the plate is 2mm. Find the viscosity of the fluid if the weight of the plate is 90N
Answer:
[tex]\mu =0.169704 Ns/m^2[/tex]
Explanation:
From the question we are told that
Area of plate[tex]a=1m^2[/tex]
Angle of inclination [tex]\theta=60 \textdegree[/tex]
Velocity [tex]v=0.75m/s[/tex]
Thickness of oil [tex]t=2mm[/tex]
Weight of plate [tex]w=90N[/tex]
Generally the equation for shear force is mathematically given by
[tex]F=mgsin45 \textdegree[/tex]
[tex]F=90sin45 \textdegree[/tex]
[tex]F=63.639N[/tex]
[tex]F=\mu* \frac{v}{t}[/tex]
[tex]F=\mu* \frac{0.75}{2*10^-^3}[/tex]
[tex]\mu* \frac{0.75}{2*10^-^3}=63.639N[/tex]
[tex]\mu =\frac{63.639}{375}[/tex]
Therefore viscosity is given by
[tex]\mu =0.169704 Ns/m^2[/tex]
DC current is less than AC current
true\false
Answer:
False
Explanation:
.......................
Describe a way that gravity influenced the formation of the solar system, with the planets orbiting the sun.
Gravity influenced the formation of the solar system, with the planets orbiting the sun.
What is Gravitational Force ?Gravitational force is force of attraction between two masses. Gravitational force(F) between two bodies is directly proportion to the product of masses(m₁,m₂) of two bodies and inversely proportional to square of distance(r) between them. mathematically it is written as,
F [tex]\alpha[/tex] m₁.m₂
F [tex]\alpha[/tex] 1/r²
F = G m₁,m₂÷r²
where G is gravitational constant, whose value is 6.6743 × 10⁻¹¹ m³ kg-1s⁻².
Force is expressed in Newton N in SI unit. its dimensions are [M¹L¹T⁻²].
According to Kepler's first law of motion, every planet is moving in an elliptical orbit with sun has situated at one of the foci of the orbit.
when a planet moves in the orbit around the sun, it moves in a stable orbit. in this orbit , centripetal force is equal to centrifugal force, in this case centripetal force appears as gravitational force. Means Gravitational force between sun and planet balances the centrifugal force which is outwards. In such a way gravity influenced the formation of the solar system.
Hence gravity plays crucial role in the formation of solar system.
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