Answer:
Average speed = 800 km/h and average velocity = 0
Explanation:
You fly round-trip from Los Angeles to New York.
Distance covered, d = 4800 km in 6 hours
We need to find the average speed and average velocity on this round-trip flight. Round trip means to come back at the initial point.
Total distance = 4800 km + 4800 km = 9600 km
Time, t = 6 h + 6 h = 12 h
Average speed,
[tex]v=\dfrac{9600\ km}{12\ h}\\\\v=800\ km/h[/tex]
So, the average speed is 800 km/h
When it comes back to the initial point. Its displacement is equal to 0. It means its average velocity will be equal to 0.
Acceleration occurs when an object changes its ____________________ or ____________________ or both.
Answer:
Acceleration occurs when an object changes its VELOCITY or DIRECTION or both.
Explanation:
Answer:
When the velocity of an object changes it is said to be accelerating. Acceleration is the rate of change of velocity with time. ... Acceleration occurs anytime an object's speed increases or decreases, or it changes direction. Much like velocity, there are two kinds of acceleration: average and instantaneous. answer velocity or direction.
hope this helps!
roxy is driving down east capital. she drives 1380 meters in 45 seconds. assuming she does not speedup or slow down,what is her speed in meters per second ?
Answer:
30.66667
Explanation:
this should be it i did the math
Suppose the airplane in the preceding problem fires a projectile horizontally in its direction of motion at a speed of 300 m/s relative to the plane. (a) How far in front of the release point does the projectile hit the ground? (b) What is its speed when it hits the ground?
Answer:
a) s = 5619.2 m
b) v = 456.5 m/s
Note: The preceding question is given below:
An airplane flying horizontally with a speed of 500 km/h at a height of 800 m drops a crate of supplies (see the following figure). If the parachute fails to open, how far in front of the release point does the crate hit the ground?
Explanation:
From the preceding question;
height, h = 800 m,
speed of plane = 500 km/h = 500000 m / 3600 s = 139 m/s
Speed of projectile = 139 m/s + 300 m/s = 439 m/s
a) using h = ut + 1/2 * gt² = 1/2 gt² (sice u = 0)
t = √(2h/g) where g = 9.8 m/s²
t = √(2 * 800/9.8)
t = 12. 8 s
horizontal distance, s = horizontal velocity * time
s = 439 * 12.8
s = 5619.2 m
b) Final vertical velocity v₂ = u - gt
v₂ = 0 - 9.8 * 12.8 = 125.4 m/s
horizontal velocity, vₓ = 439.0 m/s
resultant velocity, v = √(v₁² + vₓ²)
v = √{(125.4)² + (439.0)²}
v = 456.5 m/s
what do you mean by MA of lever is 2
Answer:
MA of a lever is 2. It means the lever can lift a load of 2 times heavier than the effort
Pls help me it do in 10 minutes !!!!!!
Answer:
473.28m/s^2
Explanation:
ac=4×9.86×75m/ 6.25 =2958m÷6.25=473.28 m/s^2<exponent
i hope this help
dont blame me if im wrong
im only 13 but :) tell me if im wong or not hehe after u know the answer
someone teach me this
Rachel travels 100km in 5hrs. Find her AVERAGE SPEED. i need work shown too
Answer:
20kph
Explanation:
Since she travels 100kpm in 5 hours and 100 divided by 5 is 20 she would travel 20km in one hour
Can somebody plz answer this correct quickly!!!! :D
(WILL MARK BRAINLIEST)
(Use google idc)
Answer:
I think the answer is, Both humans and whale embryos have a tail and a backbone (I'm not sure).
Explanation:
This is because, both human and whale embryos have a tail and a backbone.
Hope this helps! :D
A car is accelerating at a rate of 35 m/s2 and has a resulting velocity increase from 17 m/s to 26 m/s. How long did it take to change its velocity?
Answer:The answer is (60 mph - 0 mph) / 8s = (26.8224 m/s - 0 m/s) / 8s = 3.3528 m/s 2 (meters per second squared) average acceleration. That would be 27,000 miles per hour squared.
Explanation:
Orange juice with pulp floating around is an example of what type of mixture?
Group of answer choices
heterogeneous mixture
homogeneous mixture
Answer:
I hope this helps
Explanation:
homogeneous mixture
A car rolls down a hill from rest and reaches a velocity of 18.0 m/s in a distance of 25.0
m. Find the acceleration of the cart.
Answer:
I’m so sorry I tried solving it but I don’t understand it can you explain the question a little bit more ty
Explanation:
All of the following protects against flooding except (1 point)
a. dams
b. levees
c. flood sirens
d. evacuation
Answer:B
Explanation:
so like what happens if i eat a new born baby do i get super powers
Answer:
probaby not
Explanation:
you might get thrown in jail tho
A battery provides a potential difference of 14V. What size current will flow through a 10 ohm resistor in this circuit?
Answer:
I = 1.4 [amp]
Explanation:
To solve this problem we must use ohm's law, which tells us that the voltage is equal to the product of the current by the resistance.
Therefore:
V = I*R
where:
V = voltage = 14[V]
I = current [amp]
R = resistance = 10 [ohm]
I = 14/10
I = 1.4 [amp]
car jack is machine helps people do work by?
Answer:
d. changing the direction if force
kindly follow.tnx
Answer: Your answer for this question would be letter D if this is wrong let me know ok have a great day and keep the good work up.
Explanation:
28 g of iron shot is added to a graduated cylinder containing 40 ml of water The water level rises to the 44 ml mark. From this information, calculate the density of iron
Answer:
700 kilogram/cubic meter
Explanation:
We have that for the Question "28 g of iron shot is added to a graduated cylinder containing 40 ml of water The water level rises to the 44 ml mark. From this information, calculate the density of iron" it can be said that the density of iron is
[tex]\rho=7.125m/l[/tex]
From the question we are told
28 g of iron shot is added to a graduated cylinder containing 40 ml of water The water level rises to the 44 ml mark.
From this information, calculate the density of iron
Generally the equation for the Density is mathematically given as
[tex]Density=\frac{M}{V}\\\\\rho=\frac{28.5}{44-40}\\\\\rho=7.125m/l[/tex]
Therefore
the density of iron is
[tex]\rho=7.125m/l[/tex]
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A motorbike is traveling to the left with a speed of 27.0 m s 27.0 s m 27, point, 0, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction when the rider slams on the brakes. The bike skids 41.5 m 41.5m41, point, 5, start text, m, end text with constant acceleration before it comes to a stop. What was the acceleration of the motorbike as it came to a stop?
Answer:
The acceleration of the motorbike as it came to a stop was -8.78 m/s² (NOTE: Negative sign indicates deceleration)
Explanation:
From the question,
A motorbike is traveling to the left with a speed of 27.0 m/s.
This is the initial speed, that is, initial speed = 27.0 m/s
Also, from the question,
The rider slams on the brakes and the bike skids 41.5 m, that is, the bike covers a distance of 41.5 m after the rider slams on the brakes.
Distance = 41.5 m
To determine the acceleration of the motorbike as it came to a stop,
Since, the bike came to a stop, then, the final speed is 0 m/s
From one of the equations of motion for linear motion
v² = u² + 2as
Where v is the final speed (velocity)
u is the initial speed (velocity)
a is the acceleration
and s is the distance
From the question
v = 0 m/s
u = 27.0 m/s
s = 41.5 m
Putting these into the equation
v² = u² + 2as
0² = 27.0² + (2×a×41.5)
0 = 729.0 + 83a
83a = -729.0
a = -729.0 / 83
a = -8.78 m/s² (NOTE: Negative sign indicates deceleration)
Answer:
8.8 m/s^2
Explanation:
Khan Academy answer
A 2-kg girl sits on a carousel 0.5 m away from the axis of rotation. If the centripetal force is 80 N, what is the
speed that maintains her circular motion?
Answer:
40M/S
Explanation:
BY CALCULATION USING THE FORMULA S=FD
A loaded Costco shopping cart has a weight of 188 pounds(lb). You have to push the cart with a force of 14 pounds(lb) to keep it moving with a constant velocity of 1.1 m/s. What must be the magnitude (absolute value) of the force of friction on the cart?
Answer:
Force of friction = 14 pound
Explanation:
Magnitude = Force / Weight
Magnitude = 14 / 188
Magnitude = 0.074
So,
Force of friction = 14 pound
Force of friction is same as forcee
Frictional force along the direction of motion = 14 pounds
Frictional force is the resistance force towards relative motion. Frictional Force is a force the equation for which is given by the equation
[tex]f = \dfrac{\mu}{N} \\\mu = Coefficient \; of \; Friction \\\\N = Normal \; Reaction[/tex]
Weight of the Castco shopping cart = 188 Pounds (lb)
Force required to push the cart = 14 Pounds
Uniform velocity of shopping cart = 1.1 m/s
Acceleration in the direction of motion of cart = 0 m/s
So we can say that the forces in direction of motion must be balanced
So the magnitude (absolute value) of the frictional force along the direction of motion
= 14 pounds
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1. A mass of 630g is hung on a spring. Using Force = mass x gravity, what is the force of the mass, acting on the spring?
Answer:
The answer is 6.3
Explanation:
[tex]f \: = \: m(kg) \times g( \frac{n}{kg} )[/tex]
[tex]f \: = \: 630 \times {10}^{ - 3} \times 10 = 6.3[/tex]
The normal force acting on a body is the weight by gravitational pull of earth. The force acting on the hanging mass of 630 g is 6.17 N.
What is force?Force is an external agent acting on a body to deform it or to change it from the state of rest or motion. Force is a vector quantity having both magnitude and direction.
A normal force acting on a body is due to its weight by gravitational pull of earth. The force of gravitation is a kind of force by which an object attracts other objects into its centre of mass. The strength of force depends on the mass of the object.
The weight of an object in earth is the product of its mass and gravity. The acceleration due to gravity on earth is 9.8 m/s². Therefore, the force by weight of the hanging mass of 630 g or 0.630 Kg is :
0.63 × 9.8 m/s² = 6.17 N.
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Alex and Izzy are conducting an experiment to see what natural material could best be used for insulating pipes to keep them from freezing in the winter. What is the independent variable of their experiment?
If the lift has a maximum power of 5000 W, how much time would it take the lift to
perform 35,000 J of work?
Answer:
T=35,000J/5000W=7s
Halley's orbit is a very eccentric (stretched-out) ellipse, so at perihelion Halley's Comet is only about 90 million kilometers from the Sun, compared to more than 5 billion kilometers at aphelion. Does Halley's Comet spend most of its time near its perihelion distance, near its aphelion distance, or halfway in between? Explain.
A disc is thrown through the air for 1.5 min with a power output of 12.5 W. How much work is done when throwing the disc?
Answer:
work = 1125 [J]
Explanation:
To solve this problem we must remember the definition of power, which is defined as the relationship between work and time. The power can be calculated using the following equation:
Power = work/time
Power = 12.5 [w]
work = joules [J]
time = 1.5 [min] = 90 [s]
work = 12.5*90
work = 1125 [J]
Sample Response: I disagree with her because an atom has two main parts: the nucleus and the electron cloud. Atoms have three subatomic particles: protons, neutrons, and electrons. Which of these statements did you include in your answer? Check all that apply The two main parts of an atom are the nucleus and the electron cloud. The three subatomic particles of an atom are protons, neutrons, and electrons.
Answer:
A and B
Explanation:
Both the given statements are true.
An atom has two main parts that include the nucleus and the electron cloud and an atom has three subatomic particles electron, proton and neutron.
The nucleus is consists of neutrons (neutral subatomic particles) and protons (positively charged) and the cloud of electrons consists of electrons which are negatively charged particles.
Hence, the correct answer is "A and B".
how much work is done when a man uses a force of 400 N to push a car a distance of 50 metres
Answer:
The answer is 20,000 JExplanation:
The work done by an object can be found by using the formula
workdone = force × distanceFrom the question
force = 400 N
distance = 50 m
We have
work done = 400 × 50
We have the final answer as
20,000 JHope this helps you
How are electromagnetic waves used in bar-code scanners?
Answer:
A barcode reader (or barcode scanner) is an optical scanner that can read printed barcodes, decode the data contained in the barcode and send the data to a computer. Like a flatbed scanner, it consists of a light source, a lens and a light sensor translating for optical impulses into electrical signals.
Explanation:
A barcode reader (or barcode scanner) is an optical scanner that can read printed barcodes, decode the data contained in the barcode and send the data to a computer. Like a flatbed scanner, it consists of a light source, a lens and a light sensor translating for optical impulses into electrical signals.
A marble rolls across a table for 6 meters in 2.3 seconds. What is the
velocity of the marble?
Answer:
2.61 [tex]\frac{m}{s}[/tex]
Explanation:
v= d/t
v = 6m/2.3 s
v=2.61 [tex]\frac{m}{s}[/tex]
Answer:
[tex]\boxed {\tt v\approx2.61 \ m/s}[/tex]
Explanation:
Velocity can be found by dividing the displacement by the time.
[tex]v=\frac{d}{t}[/tex]
The displacement is 6 meters and the time is 2.3 seconds.
[tex]d= 6 \ m\\t= 2.3 \ s[/tex]
Substitute the values into the formula.
[tex]v=\frac{6 \ m}{2.3 \ s}[/tex]
Divide.
[tex]v=2.60869565 \ m/s[/tex]
Let's round to the nearest hundredth. The 8 in the thousandth place tells us to round the 0 to a 1.
[tex]v\approx2.61 \ m/s[/tex]
The velocity of the marble is about 2.61 meters per second.
Which of the following characteristics do all unicellular organisms share?
Answer:
Asexual production they can be eukaryotes or prokaryotes
Explanation:
Which of the following happens to an object in uniform circular motion?
A. it’s velocity changes
b. it’s speed changes
c. it’s centripetal acceleration changes
d. the direction of its velocity stays the same
Answer:its velocity changes
Explanation:
you already know i dont have much time
Answer:
its option c the age of a fossil can be determined