(a) By definition of average acceleration,
a = ∆v / ∆t = (0 - 38 m/s) / (5.0 s)
a = -7.6 m/s²
(b) Recall that
v² - u² = 2 a ∆x
where u and v are initial and final velocities, respectively; a is acceleration; and ∆x is the change in position. So
0² - (38 m/s)² = 2 (-7.6 m/s²) ∆x
∆x = 95 m
Can someone help me please :( ASAP. Also I’m sorry if it’s small
Answer:
Graph #2
Explanation:
Notice, on the position time graph, there is a constant rate of change. This means that there is a constant velocity, meaning it's a straight line. The line is decreasing so the velocity will be negative.
A 400 N student climbs up a 3.0 m ladder in 4.0s.
a)How much work does the student do?
b)What is the student’s power output?
Answer:
We are given that the student has a weight of 400N
So, the force applied by the boy has to be added to 400 since he has to apply force to keep his body on the stairs
We are given:
u = 0 m/s
v = v m/s
t = 4 s
a = a m/s/s
s = 3 m
w = 400 N
Converting to Mass
w = m * g (where m is the actual mass and g is the value of gravity)
letting g = 10m/s/s
400 = 10 * m
m = 40 kg
Finding Acceleration:
From the second equation of motion:
s = ut + (a*t*t) / 2
3 = (0)(4) + (a)(4)(4)/2
3 = 8a
a = 3/8 m/s/s
Force Applied by the Student:
Now that we have the acceleration, we can find the force applied by the student to go up the stairs
F = ma (Newton's second law of motion)
F = (40)(3/8)
F = 15 N
Hence, the student is applying 15N to climb up the stairs and another 400 N to support his mass
Total Force applied by the Student:
F(total) = F(climbing) + F(weight)
F(total) = 15 + 400
F(total) = 415 N
Work done by the Student:
Work done = F.S (dot product of force applied and displacement)
Work done = (415)(3)
Work done = 1245 Joules
Power Output of the Student:
power output is the amount of work done per second
Power = Work Done / t
Power = 1245 / 4
Power = 311.25 Watt
**note that the this is just the power consumed by the student to climb the stairs**
a point charge q is held stationary at the origin, its electric potential of 2.8 x 10^4 V is measured at 1.1m away from the point charge. what is the magnitude of the point charge q
The magnitude of the point charge held stationary at the origin and at given electric potential is determined as 3.42 x 10⁻⁶ C.
Magnitude of the charge
The magnitude of the charge held stationary at the origin is calculated as follows;
V = kq/r
where;
k is Coulomb's constant = 9 x 10⁹ Nm²/C²q is the magnitude of the charge = ?r is the distance of separation = 1.1 mSubstitute the given parameters into the above equation and solve magnitude of the point charge.
kq = Vr
q = Vr/k
q = (2.8 x 10⁴ x 1.1)/(9 x 10⁹)
q = 3.42 x 10⁻⁶ C
Thus, the magnitude of the point charge held stationary at the origin and at given electric potential is determined as 3.42 x 10⁻⁶ C.
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If you double the size of the larger pad of a hydraulic system, how much less force do you need to apply to the smaller pad to achieve the same result?
A. 1/4 the force
B. 1/2 the force
C. 1/3 the force
D. The same amount of force
Answer:
A - ¼ of the force
Explanation:
According to Pascal’s principle, there's an equation that relates the force to area ratios in hydraulic systems, provided that the pistons will be at the same vertical height and that the friction in the given hydraulic system is negligible. This formula is;
F1/A1 = F2/A2
Thus;
F1/F2 = A1/A2
Where F is the applied force and A is area of pad.
Now, we are told that the size of the pad is doubled. Thus;
If the initial radius is r, then the new radius is 2r
Thus;
F1/F2 = (πr²)/(π(2r)²)
F1/F2 = r²/4r²
F1/F2 = ¼
F1 = ¼F2
Thus, the answer is ¼ of the force
the density of gold is 19kg/cm³ find the volume of a) 38g b)0.095kg. solve this question and give explanation i will mark you as brainlist
Answer:
a) 0.002 cm³
b) 0.005 cm³
Explanation:
density d = 19 kg/cm³
Given mass m, find volume V
The definition of density is
d = m/V
so V = m/d
a) m = 38 g = 0.038 kg
so V = 0.038/19 = 0.002 cm³
b) m = 0.095 kg
V = 0.095/19 = 0.005 cm³
Time management skills include
A. A personal mission statement, prioritizing, and deep breathing.
B. Setting objectives, knowing your limits, and reviewing.
C. Avoiding distractions, setting dreams, and budgeting time.
D. Budgeting time, avoiding stress, and prioritizing.
Answer:
D.
Explanation:
Budgeting time, avoiding stress, and prioritizing.
Cameron and Morgan are each holding a bar magnet with opposite poles facing each other. They walk in opposite directions until they stop feeling their magnet pull towards the other one What can they conclude about the distance between them when they stop feeling their magnets pull?
A. They are outside the magnetic field of their magnets.
B. The distance made the magnets' force stronger.
C. The magnetic field was weaker when they were close.
D. The magnetic fields are far enough apart to change direction.
Answer:
a.
Explanation:
i did a quizz for it im sorry if im wrong
If Benjamin skated 80 kilometers at 10 kilometers per hour, how long was Benjamin skating? Express your answer in minutes
A: 240 minute
B: 480 minutes
C: 180 minute
Answer:
480
Explanation:
first simplefie 80 ÷10
now
8x 60
480
An object on the surface of the earth weighs 90 lb. At two earth radii above the surface, It will welgh:
270 lb.
10 lb.
90 lb.
30 lb.
A tennis player hits a ball 2.0 m above the ground.
The ball leaves his racquet with a speed of 25.0
m/s at an angle 5.2° above the horizontal. The
horizontal distance to the net is 7.0 m, and the net
is 1.0 m high. By how much does the ball clear the net?
Explanation:
initial height, yo = 2 m
initial velocity, u = 20 m/s
angle of projection,θ = 5 degree
distance of net = 7 m
height of net = 1 m
Let it covers a vertical distance y in time t .
Use Second equation of motion for vertical motion
As it hits the ground in time t, so put y = 0
Taking positive sign, t = 0.84 s
The ball travels a horizontal distance x in time t
X = 20 Cos5 x t
X = 16.76 m
As this distance is more than the distance of net, so it clears the net.
Let t' be the time taken to travel a horizontal distance equal to the distance of net
7 = 20 cos5 x t'
t' = 0.35 s
Let the vertical distance traveled by the ball in time t' is y'.
So,
y' = 2.008 m
So, it clears the net which is 1 m high.
It clears the net by a vertical distance of 2.008 - 1 = 1.008 m and horizontal distance 16.76 - 7 = 9.76 m
your welcome, and have a great day.
The current is 0.720 A in a circuit in which a battery of emf 12.0 V is connected to a resistor of resistance 14.5 Ω. Find the potential difference across the terminals of the battery.
Answer:
explain the meaning of the term work done and give an example of where work is done
PLEASE HELP QUICK
Engines transform the energy in fuel into mechanical energy, heat, and sound.
Why is some of the energy in fuel always transformed into heat?
A.It is possible to build an engine that runs without heating up, but it would be expensive.
B. It is not possible to build an engine that runs without heating up.
C.It is possible to build an engine that runs without heating up, but technology has not advanced enough for it yet.
D.Engines can run cold, but it damages the engine. Most engines are heated up for this reason.
Answer:
B.
Explanation:
it is impossible to make an engine work without heating up because there is friction plus I took the test
Answer:It is not possible to build an engine that runs without heating up.
Explanation:
If a 50 N block experiences a force of kinetic friction of 11 N
from the surface of a table, then what is the coefficient of
kinetic friction () between the block and the table?
Answer:
F(friction) = μ M g definition of frictional force
μ = F / (M g) = 11 N / 50 N = .22
The co-efficient of kinetic friction between the block and the table is 0.22.
To find the co-efficient of friction, the given values are,
Friction force - 11 N
Normal force - 50 N
What is Friction force?The forces acting with the force of gravity, normal and the force of friction. Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.We know that the frictional force is the force that opposes the motion of an object.Frictional Force refers to the force generated by two surfaces that contact and slide against each other.F(friction) = μ M g F - frictional forceM g = N - Normal force ( M g - Mass and the acceleration due to gravity)μ - Coefficient of frictioncoefficient of kinetic friction = friction force / normal forceμ = 11 N / 50 N
= 0.22
Thus, the co-efficient of the kinetic friction is 0.22
Learn more about frictional force,
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What happens to pressure if temperature increases?
what's the biggest animal ever
Blue whale was the biggest animal ever
Hope that helped!
You have been hired by a "storm chaser" as an assistant. This individual loves to find locations at which tornadoes and violent lightning storms are occurring. While there, he takes photographs and makes electromagnetic measurements. You are on a chase with him to a lightning storm in Florida. He explains to you that a cloud layer and the ground can be considered as the plates of a capacitor that stores charge, with the ground being charged negatively. The capacitor continuously leaks charge due to the free charges in the air between the plates. In thunderclouds, however, various processes result in charge distributions that eventually lead to lightning, a phenomenon that delivers negative charge to the ground. Therefore, the lightning recharges the capacitor. Ahead of you is a cloud layer that the storm chaser measures to be of area 2.00 km2 and height 10 km above the ground. He then uses a special apparatus called a field mill to measure that the electric field under the cloud is 4.00 â 10^6 N/C.
He asks you to do a quick calculation of the charge on the cloud-ground capacitor (in C), so you can know what to expect if there is a bolt of lightning.
Answer:
The value is [tex]q = 70.8\ C[/tex]
Explanation:
From the question we are told that
The area is [tex]A = 2.0 \ k m^2 = 2000000 \ m[/tex]
The height is [tex]h = 10 \ km = 10000 \ m[/tex]
The electric field is [tex]E = 4.0*10^{6} \ N/C[/tex]
Generally the electric field is mathematically represented as
[tex]E = \frac{q}{A * \epsilon_o }[/tex]
Here [tex]\epsilon_o }[/tex] is the permitivity of free space with value
[tex]\epsilon_o } = 8.85 *10^{-12} \ N \ m^2 /C^2[/tex]
=> [tex]4.0*10^{6} = \frac{q}{2000000 * 8.85 *10^{-12} }[/tex]
=> [tex]q = 70.8\ C[/tex]
A 8-kg object is moving with a speed of 5 m/s at a height of 4 m. The kinetic energy of the object is approximately ____ J. *
Answer: 100J
Explanation: K = 1/2mv^2
m=8
v=5
1/2 * 8 * 5^2
1/2 * 8 * 25
4 * 25
100
A constant voltage of 11.00 V has been observed over a certain time interval across a 1.20 H inductor. The current through the inductor, measured as 1.00 A at the beginning of the time interval, was observed to increase at a constant rate to a value of 7.00 A at the end of the time interval. How long was this time interval
Answer:
0.65 sec
Explanation:
V = L*ΔI/Δt
so Δt = L*ΔI/V = 1.20 * (7.00 - 1.00)/11.00 = 0.65 sec
What kind of nutrient comes from water and air?
mineral nutrients
non-mineral nutrients
Answer:
The answer is non-mineral nutrients.
Answer:
non-mineral nutrients.
Explanation:
A golf ball is hit 36 m/s at an angle of 40° with the horizontal. What is the vertical component of the ball’s velocity?
A. 15 m/s
B.26.7 m/s
C. 23.1 m/s
D. 36 m/s
Answer:
ززث ع ثذآرثفاقآثہ تجفہجاءآڑجءبیجدءچءاءاڑڑشءڑدءحابڑءحبزیاڑچءازءچزیبزچدزچ،چدز،ڈزیجپا،جڈزیجڈیبزءفحدءڈحضغ دح دفھچءچدجءیچزءچددفحءدفءاڑحعخ حدھغچغھافءاڑاڑہشھدفڈچقڈ،شڈیچڑ
A grasshopper is an insect that goes through three distinct stages during its life cycle. The life cycle of a grasshopper is an example of which one of the following?
A. Quick metamorphosis
B. Slow metamorphosis
C. Complete metamorphosis
D. Incomplete metamorphosis
Answer:
B is the answer bc it's no way c an a and d can maybe c
it is more difficult to climb a vertical staircasethan a slanted one
Answer:
it's because of friction
Explanation:
In slanted one the friction will be less so it would be more difficult to climb
what's the toughest animal in the world
Answer:
In explanation
Explanation:
Toughest animal existing now would be like a bear more specifically a grizzly bear. I say this because when your near this animals and your messing with it or it's cubs your more than likely dead you climb up a tree,did you forget they can climb to,when running a grizzly bear can get up to a max speed of 35 MPH, Now the grizzly bear isn't the most aggressive but is still one of the rulers of bears along with it's relative the polar bear,but when you are talking about pain they can't take pain shoot them it takes more than 1 show better have a machine gun or be able to run fast a knife isn't going to do a lot in less you get it in it's eye. Now for a grizzly bear you can play dead and he will fall for it or she but all you need to know is don't mess with it.
Another one of the toughest animal is a komodo dragon.
When were talking about a komodo dragon there like a human they way up to 170 LBS to 200 LBS they have a length of 8 foot and a half. Now komodo dragons are very friendly and can be a family pet but if that thing bites you,you will be dead within hours in less treated amindentally. The komodo dragon can kill water buffalos, and the komodo dragon has no predators. The komodo dragon is the biggest lizard in the world and is poisonous so that is a reason to not get around with, one time a komodo dragon killed an eight year old boy so not really friendly.
is there anymore things you want my opinion on on actually the real deal.
would you like to know most aggressive,
most dangerous,
most poisonous,
The most feared
the most loving
The biggest animal in the world
The most friendly or other just let me know:)
Hope it helps have a great afternoon:)
Ms. Haddox was hiking in the Grand Canyon. She traveled 61 meters in 647 seconds then she traveled 9 meters in 852 seconds, and on the third leg of the hike she traveled 32 meters in 805 seconds. What is the average speed of Ms. Haddox during her hike?
Answer:
45
Explanation:
A car accelerates from rest. It reaches a velocity of 25m/s in 10 seconds. What was the cars acceleration
Answer:
a = 2.5 m/s^2
Explanation:
u = 0
v = 25
t = 10
(using first eq. of motion)
a = (v - u) /t
a = (25 - 0) /10
a = 25/10
a = 2.5 m/s^2
A force of 20N acts upon of 5 kg. Calculate the acceleration of the object.
Answer:
Acceleration= 4 m/s
Explanation:
F = ma
20 N = (5kg)(a)
4m/s = a
will there be a mega tsunami like in the movie tidal wave from 2009?
What is the correct definition of a circuit?
How does the magnitude of the electrical charge on objects affect the
electric force between them? *
As the charge increases, the force decreases in strength
As the charge increases, the force becomes more negative
As the charge increases, the force increases in strength
Answer:
As the charge increases, the force decreases in strength
Explanation:
Experiments with electric charges have shown that if two objects each have electric charge, then they exert an electric force on each other. The magnitude of the force is linearly proportional to the net charge on each object and inversely proportional to the square of the distance between them...
Answer: The correct answer is: As the charge increases, the force increases in strength
Explanation:
Its kind of the obvious answer and other people don't know how to answer correctly. This was years ago but if anyone needs the answer today then here it is....
Which is the best reason Venus' temperature is approximately uniform, hot on both day and night sides?
plate tectonics
retrograde rotation
atmospheric convection
planetary differentiation
differential rotation
The main reason Venus has a "uniform" temperature is atmospheric convection.
What is atmospheric convection?Atmospheric convection is a term to refer to the difference in temperature, in the atmospheric layer. In short, it refers to the movement of air bodies of different temperatures in the atmosphere of a planet.
In the case of Venus, atmospheric convection contributes to this planet's temperature uniformity because hot air is in constant contact with the planet's surface, preventing it from cooling.
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