The elevators in the Landmark Tower in Yokohama, Japan are among the fastest in the world. After starting from rest, they reach a maximum speed of 120 meters per minute. It takes the elevator 4.0 seconds to reach maximum speed. What is its acceleration in m/s/s (meters per second per second)?
Answer:
The acceleration is 30 m/s²
Explanation:
Given that,
Maximum speed = 120 m/s
Time = 4.0 sec
We need to calculate the acceleration
Using equation of motion
[tex]v=u+at[/tex]
Where, v = speed
u = initial speed
a = acceleration
t = time
Put the value into the formula
[tex]120=0+a\times4.0[/tex]
[tex]a=\dfrac{120}{4.0}[/tex]
[tex]a=30\ m/s^2[/tex]
Hence, The acceleration is 30 m/s²
where are some places that cyber bullying occurs? Check all that apply
A in classrooms
B in text messages
C on playgrounds
D on websites
E on social media networks
F in chat rooms.
help im being timed 01:51:15
Answer:
B, E, F
Explanation:
Because cyberbullying happens online, text messages, social media networks, and chat rooms can all have cyberbullying, because they are all ways to chat online. D does not apply, because on most websites there are not ways to chat.
Answer:
B D E AND F
Explanation:
A force of 16 N to the west is applied to each object below. Which object will undergo the greatest change in momentum
A force of 16 N to the west is applied to each object below , the object with greater mass and velocity have greater momentum. So, A 20 Kg object that is moving east at 10m/s.
What is force?
Force is an external agent acting on a body, to change it from the state of rest or motion. There are various kinds of forces such as frictional force, magnetic force, nuclear force etc.
In physics, force is the product of mass and acceleration of the body. Greater mass results greater force needed to be applied on the object to make it move or stop.
Momentum is the product of mass and velocity. Thus, as mass or velocity or both increases, momentum of the object increases. Hence the larger object moving faster will gain greater momentum.
Here, option C is the correct answer.
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what does it mean standard unit?
Answer:
Standard unit is a standard measure that remains the same whenever, wherever and by whoever it is used. eg: The standard unit of time is second.1) A long distance runner travels 32 miles in a straight line for 4.0 hours.
What is their velocity? (20 pts)
Draw: (1 pt)
Data: (3 pts)
Given:D= 32 miles
T=4 hours
Unknown:S=?
Formula (2 pts)
V=D/T
Substitution of data with units in formulas: (1 pt)
V=3274
Solve (1 pt)
Write down answers with correct units. Circle your answer. (2 pts)
Answer:
3.57632 m/s im not 100% sure but i think thats the answer
Explanation:
Which of the following is true about wedges?
A.)Wedges are a type of ramp.
B.)Wedges are a type of screw.
C.)Wedges are a type of inclined plane.
D.)Wedges are a type of lever.
Answer:
wedges are a type of inclined plane.
Explanation:
i just answered :) :) :)
Wedges are a type of inclined plane is true about the wedges.aThe type of wedges is categorized on the basis of the angles of the inclined plane.
What are wedges?
A piece of wood, metal, or other material with one thick end and a thin edge that is used to attach or separate two things or sections of an object."A wedge was used to fasten the door"
The wedge family consists of four designs: pitching wedge, gap wedge, sand wedge, and lob wedge. Each stick has a different loft, which makes it better for various shots.
The Pitching Wedge is the wedge with the lowest loft. It may be utilized for full swings toward the greens as well as lengthy chip shots.
Hence wedges are a type of inclined plane is true about the wedges.
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A bumper car with a mass of 240 kg is moving to the right with a velocity of 2.3
m/s. A second bumper car with a mass of 260 kg is moving to the left with a
velocity of 2.7 m/s. After the collision the first car's velocity is 2.9 m/s left, the
velocity of the second car is 2.1 m/s to the right. Prove conservation of momentum.
Assume the surface is frictionless.
Answer:
See the explanation below
Explanation:
To solve this problem we will take the definition of linear momentum, which tells us that momentum is equal to the product of mass by the velocity vector. Since velocity is a vector, we will take the right-hand movement as positive and the left-hand movement as negative, the left-hand members are taken as before the collision and the right-hand members as after the collision
ΣM1 = ΣM2
(m1*v1) + (m2*v1) = (m1*v2) + (m2*v2)
V1 = velocity before the collision [m/s]
V2 = velocity after the collision [m/s]
m1 and m2 = mass of the vehicles [kg]
Therefore:
(240*2.3) - (260*2.7) = - (240*2.9) + (260*2.1)
Resolving this arithmetic operation we will have:
720 - 702 = - 696 + 546
- 150 = - 150
We can see that before the crash and after the crash the momentum is preserved
write about any five usefulness of pressure in our daily life
Answer:
Some common use of air pressure in daily life is inflating tires, playing musical wind instruments, drinking through straw, flushing toilet, drawing water from well, operating barometer, blowing up balloon, breathing, maintaining body shape especially abdomen.
Explanation: )
Answer:
inflating balloon. pressing the switch.blowing straw.drawing water from wellbreathingHope this is helpful and I would appreciate if you add me as brainliest
Please help!!! 80 feet/sec to miles / hour
13. What change in state occurs when a liquid changes into a solid?
Answer:
heat occurs to change into solid
Answer:
It's freezing or solidification
Explanation:
The coldness freezes the water making it a solid, like water to an ice cube. Take Disney's Frozen by example. Elsa has a ice touch, so when she touches water, it becomes a solid.
A
person shoves an ice cube off a table. Which of the following acts on the ice cube after it leave
the table but before it hits the floor?
Answer:
friction I would guess? you didnt leave any options.
Explanation:
A car starts to move from point A to B such that its displacement becomes 150m. This
motion was provided by a driving force of 66MN, calculate the Kinetic energy of the
body at B.??
Answer:
sorry I cannot give the answer I know only little bit about it
To calculate the kinetic energy of the car at point B, we first need to determine its velocity at that point. We can use the work-energy principle to relate the work done by the driving force to the change in kinetic energy of the car:
Work done by driving force = Change in kinetic energy
The work done by the driving force is equal to the product of the force and the displacement:
Work done = Force x Displacement = 66 MN x 150 m = 9.9 GJ
The change in kinetic energy is equal to the final kinetic energy minus the initial kinetic energy. Assuming the car starts from rest at point A, its initial kinetic energy is zero. Therefore, the final kinetic energy at point B is equal to the work done by the driving force:
Final kinetic energy = Work done = 9.9 GJ
Note that we converted the force to MN (meganewtons) and the energy to GJ (gigajoules) to match the SI unit system commonly used in physics calculations.
Which of the following is a unit of volume in the English system of measurement? (4 points)
Meters
Gallons
Liters per cubic gram
Kilograms per cubic centimeter
Answer:
Explanation:
the answer is gallons because i got it right on the exam
what is the answer? I need help.
Answer:
moving water
Explanation:
its called hydropower its a form of renewable energy that uses moving water
a vector must always have both size and
Answer:direction
Explanation:
A vector must always have both sizes as well as direction, while on the other hand, any scalar quantity such as the mass of an object would only have magnitude but not direction.
What is a vector quantity?The quantities that contain the magnitude of the quantities along with the direction are known as the vector quantities.
Examples of vector quantities are displacement, velocity acceleration, force, etc.
A scalar number, such as an object's mass, would only have magnitude but not direction, unlike a vector, which must always have both quantities and direction.
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Which of the following best describes refraction?
A) The blending of a wave a girls room or passes through opening in a barrier
B) The blending of one wave as two or more waves try to occupy the same space at the same time
C)The bending of a wave as it passes at an angle from one material to another
D)The bending of a wave as it reflects at an
angle from a surface
Answer: C Is The Answer
Explanation:
The option that best describes refraction is Option C. The bending of a wave as it passes at an angle from one material to another.
Refraction is the shift in direction induced by a wave's change in speed when it travels from one medium to another. It is the bending of light when it travels via a translucent medium. Refraction can take place in sound waves or water waves.
The statement is in Option A and Option B is incorrect because refraction does not blend but bend.
Similarly, from Option D, refraction does not reflect at an angle from a surface but reflection does.
Therefore, we can conclude that the Option that best describes refraction is seen in Option C, i.e. The bending of a wave as it passes at an angle from one material to another.
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3. What is the mass of a paratrooper who experiences an air resistance of 400 N and an acceleration of 4.5 m/s2
during a parachute jump.
Answer:
88.89kg
Explanation:
The formula for mass is m=F/a. If we plug in the values, we get m=400N/4.5m/s^2. The mass is 88.89kg. We know that the unit is in kg because one newton (N) is 1kg*m/s^2. The m/s^2 is cancelled out by the acceleration, and we are left with kg.
What happens to the velocity of a sound wave in air if the temperature of the air increases?
A.
velocity increases
B. velocity does not change
c. velocity decreases
D. velocity drops to zero
During the process of cellular respiration, water becomes oxygen. (2 points)
True
False
Answer: False
Explanation:
Hi, I hope this helps!
During cellular respiration, glucose reacts with oxygen to produce carbon dioxide, water and energy.
Answer: False
Explanation:
List three examples of familiar organisms known as plants as used in the cell
Answer:
rose
sunflower
seaweed
I need help for 2 ASAP I haven’t been able to figure it out :(
I need help with this
Answer:
0.832
Explanation:
8.320 x 10 to the negative 1st power is 0.832
The sun will probably end up as a white dwarf. How will it be different then from what it is today
Answer:
The differences that will be observed are;
1) The Sun will become faint and will no longer be yellow but rather appear white and will no longer be visible (become invisible) by unassisted vision as we can see the Sun today
2) The size of the Sun will shrink to a size comparable to the size of the Earth
3) The Sun will cool down and will no longer radiate as much heat
4) The nuclear reactions that generate energy on the Sun's will seize and the and the heat from the Sun will be from residual thermal energy
5) The core, which is the hottest part of the Sun will no longer be hydrogen but carbon and oxygen
Explanation:
25. Describe how the atomic mass unit (amu) was derived and how the mass of the electron relates to the
mass of the nuclear particle.
HELP ASAP
Answer:
ok
Explanation:
a bullet of mass 25 g is fired from a pistol at a velocity of 200 m/s. if mass of the pistol is 2.5 kg calculate its recoil velocity
A giraffe has an acorn fall from his mouth while he is eating. The giraffe's mouth is 6 meters off the ground. It falls and hits a rock that is 1.5 meters off the ground. How long did it take the acorn to reach the rock?
Answer:
I would say at least 3 seconds
Explanation:
This may not be 100% accurate this is my opinion this could help give you an idea also let me explain. If the acorn fell 6 meters off the ground at 1.5 meters in my opinion it should go by 2 meters for every 1.5 meter in this order 1.5, 3, 4.5 and 6!
2.30 Suppose that the radius of a typical cell is 10 mm and that inside it 106 ATP molecules are hydrolyzed each second. What is the power density of the cell in watts per cubic meter (1 W = 1 J s−1)? A computer battery delivers about 15 W and has a volume of 100 cm3. Which has the greater power density, the cell or the battery?
Answer and Explanation: One ATP release approximately 30.5kJ/mol of energy. Using Avogadro's constant, it is known one mol corresponds to [tex]6.02.10^{23}[/tex] molecules, so 106 ATP molecules releases:
E = [tex]30.5.10^{3}*\frac{106}{6.02.10^{23}}[/tex]
E = [tex]537.04.10^{-20}[/tex]J
A cell is approximately a sphere. Volume of a sphere is given by
V = [tex]\frac{4}{3}.\pi.r^{3}[/tex]
Changing radius from mm to m:
r = [tex]10^{-2}[/tex]m
Then, volume is
V = [tex]\frac{4}{3}.\pi.(10^{-2})^{3}[/tex]
V = [tex]4.2.10^{-6}[/tex] m³
Power density is given by
[tex]power=\frac{energy}{volume}[/tex]
[tex]power=\frac{537.04.10^{-20}}{4.2.10^{-6}}[/tex]
[tex]power=128.10^{-14}[/tex]
power = 12.8.[tex]10^{-15}[/tex] W/m³
Power density for a the cell is 12.8.[tex]10^{-15}[/tex] W/m³.
Power density for battery is
100 cm³ = [tex]10^{-4}[/tex]m³
power = [tex]\frac{15}{10^{-4}}[/tex]
power = [tex]15.10^{4}[/tex]W/m³
Comparing cell and battery, battery has a greater power density.
15. What change of state occurs when butter turns into a liquid in a hot pan?
Answer:
Physical change from solid to liquid where it is a reversible reaction as melted butter can be frozen to its original form
HELP PLEASE: Which option is an example of an object that has potential energy followed by an object that has kinetic energy?
A the fuel in the tank of a car | a car that is parked in a parking lot
B A battery in an electric car | a car parked in the middle of a hill
C A ball held over a person's head | a ball rolling on the floor
D A person riding an elevator | a person in an elevator at the top floor
Answer:
C
Explanation:
Potential energy is energy that something has when its not moving. Kinetic energy is energy in motion. A ball held over a persons head isn't moving, meanwhile a ball in motion is using kinetic energy.
C)A ball held over a person's head | a ball rolling on the floor.
What is an object that has potential and kinetic energy?Objects may have each kinetic electricity and capacity electricity at an equal time. An item may be accelerated above the ground (have capacity electricity) and be shifting at the identical time (and now have kinetic electricity). A baseball, a plane, and a flying chicken are all easy examples of this.
Is light potential or kinetic energy?A rushing bullet, a walking person, and electromagnetic radiation like mild all have kinetic energy. Some other example of kinetic strength is the strength associated with the constant, random bouncing of atoms or molecules.
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At $0.095/kwh, what does it cost to leave a 25 w porch light on day and night for a year?
Answer:
It will cost $20.81
Explanation:
Cost of Electricity
The rate of the cost of electricity is usually expressed in $/KWH because the consumption of electricity is measured in Kilowatts-hour.
If a 25W porch light is on day and night for a full year, the electricity consumption is:
25W*24 H/Day*365 Day/year* 1 year=219,000 WH
converting to KWH: 219,000 WH = 219,000 /1000 KWH = 219 KWH
The rate is $0.095/KWH, thus:
The cost of electricity is 219 KWH*$0.095/KWH= $20.81
It will cost $20.81