12.00 min = 0.2 hr
8.00 min = 0.15 hr
Total distance:
(10.0 km/hr) (0.2 hr) + (15.0 km/hr) (0.15 hr) + (20.0 km/hr) (0.2 hr)
= 8.25 km
Average speed:
(10.0 km/hr + 15.0 km/hr + 20.0 km/hr) / 3
= 15 km/hr
Change in position:
(10.0 km/hr) (0.2 hr) + (15.0 km/hr) (0.15 hr) - (20.0 km/hr) (0.2 hr)
= 0.25 km
Average velocity:
(10.0 km/hr + 15.0 km/hr - 20.0 km/hr) / 3
≈ 1.67 m/s
Neha and Suhani are playing with two identical pendulums. They leave the bob from a certain position and wait for it to return to the same point. The one who waits for a shorter time wins. Neha leaves her pendulum from point L and Suhani leaves her pendulum from point P (see figure). What happens?
a. Neha wins as her bob comes back faster.
b. Suhani wins as her bob comes back faster.
c. No one wins as the bobs come back at the same time.
d. We cannot say any of the above for sure.
Answer:
The correct option is C
Explanation:
The pendulum bob would return at the same time because the initial angle a pendulum bob is dropped does not affect it's period (the time it takes for the pendulum to move back and forth), however the one with a larger angle move faster but would eventually arrive at the same "starting point" due to varying displacements made.
c. No one wins as the bobs come back at the same time.
The pendulum bob would return at the same time because the initial angle a pendulum bob is dropped does not affect it's period (the time it takes for the pendulum to move back and forth), however the one with a larger angle move faster but would eventually arrive at the same "starting point" due to varying displacements made.The longer the length of string, the farther the pendulum falls; and therefore, the longer the period, or back and forth swing of the pendulum. The greater the amplitude, or angle, the farther the pendulum falls; and therefore, the longer the period.)Learn more:
brainly.com/question/12886217
In this circuit, energy is transferred from a battery to a circuit wire and then to a light bulb, where some of it leaves the system. Starting from the battery, which series shows the correct order of energy transformations taking place in this circuit?
Answer: The correct order of energy transformation is from CHEMICAL ENERGY to ELECTRICAL ENERGY to LIGHT ENERGY
Explanation:
Energy which is simply defined as the ability to perform work is made up of different forms, these include:
- Mechanical energy: Associated with machines at work.
- LIGHT ENERGY: produced by light bulbs
- ELECTRICAL ENERGY: taking in by television set and other electrical appliances.
- CHEMICAL ENERGY: stores in food and other fuels
- Sound energy: Produced by vibrating objects example piano, drums.
According to the law of conservation of energy, energy can neither be created nor destroyed in a closed system, but can be transformed from one form to another, thereby keeping the energy in the closed system constant. From the question, the circuit is an example of a closed system and the order of energy transformation taking place is from the battery (CHEMICAL ENERGY) to ELECTRICAL ENERGY(power source) to LIGHT ENERGY(bulb). I hope this helps, thanks.
(5) A 4 kg. object rests on a flat, horizontal surface with a static
coefficient of friction of 0.25. What minimum force will be necessary to
start the object in motion? If the coefficient was smaller, what effect would
that have? If it was larger?
Answer:
F = 9.81 [N]
Explanation:
To solve this problem we must use Newton's third le which tells us that the sum of forces on a body that remains static must be equal to one resulting from these forces in the opposite direction.
Let's perform a summation of forces on the vertical axis-y to determine the normal force N.
∑F = 0 (axis-y)
[tex]N - m*g = 0[/tex]
where:
m = mass = 4 [kg]
g = gravity acceleration = 9.81 [m/s²]
[tex]N - (4*9.81)=0\\N = 39.24 [N][/tex]
Now we know that the frictional force can be calculated using the following equation.
f = μ*N
where:
f = friction force [N]
μ = friction coefficient = 0.25
N = normal force = 39.24 [N]
Now replacing:
[tex]f = 0.25*39.24\\f = 9.81[N][/tex]
Then we perform a sum of forces on the X-axis equal to zero. This sum of forces allows us to determine the minimum force to be able to move the object in a horizontal direction.
∑F = 0 (axis-x)
[tex]F-f=0\\F-9.81=0\\F= 9.81[N][/tex]
If the coefficient was smaller, a smaller force (F) would be needed to start the movement, this can be easily seen by replacing the value of 0.25, by smaller values, such as 0.1 or 0.05.
If the coefficient were larger, a larger force would be needed.
Planet A has a gravitational field strength of 8.0 N/kg near its surface.
Planet B has three times the mass of Planet A and is half of its size.
What would be the gravitational field strength of planet B near its surface?
Answer: 96 N/kg
Explanation:
calculate the gravitational force between earth and sun
Answer:
Given that the mass of the earth = 6 x 1024 kg, mass of the sun = 2 x 1030 kg, average distance between the two is 1.5 x 10-11 m and G = 6.67 x 10-11 Nm2kg-2
Explanation:
A projectile has an initial horizontal velocity of 34.0 M/s at the edge of a roof top. Find the horizontal and vertical components of its velocity after 5.5s
I need shown work !
Answer:
[tex]v_x=34 m/s[/tex]
[tex]v_y=53.9\ m/s[/tex]
Explanation:
Horizontal Launch
When an object is thrown horizontally with a speed v from a height h, it describes a curved path ruled by gravity until it eventually hits the ground.
The horizontal component of the velocity is always constant because no acceleration acts in that direction, thus:
vx=v
The vertical component of the velocity changes in time because gravity makes the object fall at increasing speed given by:
[tex]v_y=g.t[/tex]
The horizontal component of the velocity is always the same:
[tex]v_x=34 m/s[/tex]
The vertical component at t=5.5 s is:
[tex]v_y=9.8*5.5=53.9[/tex]
[tex]v_y=53.9\ m/s[/tex]
Please I need HELP WITH THIS QUESTION!!!
Question: List 3 common lubricants.
Its 7th Grade science Ill mark Brainlist!!!
what is nuclear energy
Answer:
Nuclear energy, also called atomic energy, energy that is released in significant amounts in processes that affect atomic nuclei, the dense cores of atoms. It is distinct from the energy of other atomic phenomena such as ordinary chemical reactions, which involve only the orbital electrons of atoms.
Explanation:
Answer: Nuclear energy, also called atomic energy, energy that is released in significant amounts in processes that affect atomic nuclei, the dense cores of atoms. It is distinct from the energy of other atomic phenomena such as ordinary chemical reactions, which involve only the orbital electrons of atoms.
Explanation: please give brainliest and thanks :)
What statement provides an example of designing a solution in the technological design process? Aerospace engineers need a lightweight material to build a jet. Engineers determine which features the material must have. Engineers test a carbon-plastic compound in a wind tunnel. The carbon-plastic compound is redesigned to save maximum energy.
Answer:
Engineers determine which features the material must have.
Explanation:
The statement provides an example of designing a solution in the technological design process is B. Engineers determine which features the material must-have.
what is the procedure for designing answers to technological issues?Steps of the technological layout system encompass: pick out trouble, research the hassle, generate possible answers, pick out the fine solution, create a version, test the model, refine and retest the model as wished, and talk the final answer.
What is a design solution?The design answer definition can be used to generate the quit product specifications with a view to be used to produce the product and to conduct product verification. This technique may be in addition delicate depending on whether or not there are extra subsystems of the quit product that need to be defined.
Learn more about Design solutions at https://brainly.com/question/5690102
#SPJ2
If a paper airplane has a forward velocity of 2 m/s, but air resistance has a velocity of 1 m/s acting against the paper airplane, then what is the resultant forward velocity of the paper airplane?
Answer:
F_{resultant} = 1 [m/s]
Explanation:
These types of problems can be solved by means of relative velocities, where vectors (forces or velocities) are necessarily handled, these velocities depending on the velocity are added or subtracted.
Forces to the right are taken as positive and negative to the left.
[tex]F_{velocity}-F_{air}=F_{resultant}\\2-1 = F_{resultant}\\\\F_{resultant} = 1 [m/s][/tex]
Which forms of heat transfer do not require matter(particles) to happen? (Select all that apply)
Conduction
Convection
Radiation
None of these
Answer:
Radiation
Explanation:
bc Radiation transfers heat through electromagnetic waves.
what is gravity ?short ans
Answer:
Gravity, or gravitation, is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light—are brought toward one another. On Earth, gravity gives weight to physical objects, and the Moon's gravity causes the ocean tides.
Please help!!!!!!!!!!!!! :((
Answer:
A.......................
Answer:
the answer you're looking for is A
Aluminium is a non magnetic metal. However, it can become magnetised under special conditions. Explain how. (4 marks)
Answer:
Exposing it to a very strong magnetic field
Explanation:
Aluminium is a non magnetic metal thus it is not magnetic under normal conditions. This is because it interacts with other magnets. The only condition that magnetism can be induced in aluminium is exposing it to a very strong magnetic field.
Complete the following sentences.
mento
When you drop a ball, it falls to the ground,
This happens because the
pulls the ball
towards it with a force called
I
Forces are measured in units called
(Total 3 marks)
What is the mass in grams of 3.1 mol of mercury, Hg Show Your work
Answer:
621.83grams
Explanation:
Using the formula;
Mole = mass ÷ molar mass
Where;
Mole = mol
Mass = grams
Molar mass = g/mol
According to the information given in this question, number of moles = 3.1mol, mass of Hg = ?, Molar mass (MM) of Hg = 200.59g/lol
Hence, using mole = mass/MM
3.1 = mass / 200.59
mass = 200.59 × 3.1
Mass = 621.829
Mass = 621.83grams
The alpha decay of radon-198
please help asap!!!!
Answer:
B
Explanation:
A duck flies 60 m in 6 seconds what is the ducks speed? Show your work plz
Answer:
Wouldn’t his or hers speed be 10m?
Explanation:
because 60 divided by 6 = 10
so 10m per second?
Which could be an example of an unbalanced force?
A. A plate sitting on a dining room table.
B. Earth orbiting the Sun
C. A ball at the top of a hill that is not moving.
D. A baseball that has been thrown to home plate.
Answer:i think its D
Explanation:
24. A soccer ball is kicked straight up into the air with a velocity of 10 m/s. How much time does it take the ball to reach its maximum height? (g = 10 m/s^2)
A 2 sec
B 100 sec
C 1.4 sec
D 1 sec
Answer:
D. Time t = 1 [s]
Explanation:
To solve this problem we must use the following equation of kinematics.
[tex]v_{f}=v_{o}-g*t[/tex]
where:
Vf = final velocity = 0 (when the ball reaches the maximum height its elevation won't be increased since the velocity is zero)
vi = initial velocity = 10 [m/s]
g = gravity acceleration = 10 [m/s²]
t = time [s]
Now replacing:
[tex]0 = 10-10*t\\10 = 10*t\\t = 1 [s][/tex]
A car, with an initial velocity of 22 m/s west, travels for 345 seconds. If it has a final velocity of 44 m/s west what is its’ acceleration?
Answer: 0.064 m/s²
Explanation:
Initial velocity = 22m/s
Final velocity = 44m/s
Time taken = 345 seconds
Acceleration = (Final velocity - Initial velocity) / Time taken
= (44 - 22) / 345
= 22/345
= 0.0637681
= 0.064 m/s²
Therefore, the acceleration is 0.064 m/s².
How can you tell the direction a river flows
Answer: Regarding the image posted, a unicellular paramecium relies on mitosis for reproduction.
I hope this helps!
The first five questions refer to the following problem:
A model rocket lifts off with an upward thrust of 35 Newtons. It has a mass of 2.5 kilograms and a weight of 25 Newtons. How quickly does the rocket accelerate?
What is the first equation you would use to answer this question?
Question 3 options:
Fnet=F↑−F↓
Δt=Δdv
Δd=d2−d1
F12=−F21
Answer:
Δd=d2−d1Explanation:
good morning10. Does the Earth's magnetic field protect us from the Sun's particles? What are the auroras?
A student jumps off of a cliff into a river 25.9 m below. If the student landed 20.7 m horizontally away from where they jumped how much time was the student airborne?
Can you please answer qeastion
Answer:
the mantel
Explanation:
yeeeeaaaaaaa
Please find the average of the following numbers
9,10,100,50,20
Answer:
Average: 22.142857142857
Average =
Sum
Count
=
155
7
= 22.142857142857
Sum 155
Count 7
Median 23
Geometric Mean 16.412764443111
Largest 38
Smallest 2
Range 36
Answer:
15.4
Explanation:
if you know how to SHiFT in sleep how do you do it
An astronaut weighs 160 Newtons on the surface of of the moon where the acceleration due to gravity is 1.6 m/s/s. What is his weight on EARTH, where the acceleration due to gravity is 10 m/s/s? Include units in your answer. *
Answer:
The weight of an object with mass M, in a place with gravitational acceleration G, is:
W = M*G
We know that in the moon, with G = 1.6 m/s^2, the weight is 160N
Then we have the equation:
160N = (1.6 m/s^2)*M
With this, we can find the mass of the astronaut.
(160N)/(1.6 m/s^2) = M = 100kg.
Then in the Earth, where the acceleration is G = 10 m/s^2, the weight will be:
W = (10m/s^2)*100kg = 1000 N