Answer:
a) Find the work done by the resistive force during the roundtrip.
W=-30kJ
b) Is the resistive force a conservative force? explain.
The resistive force is not a conservative force since the work done during the round trip is not zero
Explanation:
The worf done on object y a constant force F is given by:
W= (F cos ∅)S
Where S is the displacement and ∅ is the angle between the force and the displacement.
The displacement of the bicycle during each part of the trip is s=5000m and teh magnitude of teh resistance force is F=3.0N
∅1=180° he angle between the displacement and the force
W1=W2
W1 = (3.0 cos180) 5000m
W1=-15.O kJ
W=W1+W2
W=-30kJ
The resistive force is not a conservative force since the work done during the round trip is not zero
(a) The work done by the resistive force is 15,000 J
(b) The work done the resistive force is non-conservative since the resultant resistive force in not zero.
Work doneWork is said to be when an applied force displaces an object from its initial position.
Work done by resistive forceThe work done by the resistive force is calculated as follows;
W = FΔr
W = 3 x (5,000 - 0)
W = 15,000 J
Thus, the work done the resistive force is non-conservative since the resultant resistive force in not zero.
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The resolution of a telescope is ultimately limited by the diameter of its objective lens or mirror. A typical amateur astronomer's telescope may have a 6.09 in diameter mirror. What is the minimum angular separation (in arc seconds) of two stars that can be resolved with a 6.09 in scope
Answer:
θ = 3.19 arc second
Explanation:
The resolution of a telescope is given by the rayleigh criterion, which establishes that two objects are separated if the principal maximum of diffraction of one of them coincides with the first minimum of diffraction of the second object, based on this the solution is given by the first diffraction minimum, the a slit is
a sin θ = m λ
with m = 1
in the case of circular apertures the equation must be found in polar coordinates, therefore a numerical constant is introduced
a sin θ = 1.22 λ
Angles are measured in radians and in these experiments they are small
sin θ = θ
θ= 1.22 λ / a
in this case a = 6.09 in, the wavelength is wrong = 550 10⁻⁹ m which is the maximum resolution of the human eye
l
et's reduce the magnitudes to the SI system
d = 6.09‘ 2.54 10⁻-2 m / 1 inch = 15.4686 10-2 m
let's calculate
θ = 1.22 550 10-9 / 15.468 10-2
θ = 15.5 10⁻⁶ rad
rad = 2.06 105 s
θ = 15.5 10⁻⁶ rad 2.06 105s/ 1 rad
θ = 3.19 s
What is the angle of muscle pull?
Answer:
The angle formed between the line of pull of a muscle and the longitudinal axis of the bone in which the muscle is acting. The line of pull is usually indicated by the joint angle. It affects the strength of muscle action; at only certain angles of pull can a muscle exert maximal tension.
Explanation:
hope this helps sorry if it doesn't have a good rest of your night :) ❤
Will mark BRAINLYEST
Answer:
A dribble ends when the player touches the ball with both hands simultaneously or permits the ball to come to rest in one or both hands. The ball being touched with both hands simultaneously (dribble with both hands) is a double dribble
Nothing in the rulebook that says a player cannot start a dribble with two hands. A dribble can end when touching both hands simultaneously, but a single dribble is OK as long as you catch the ball
Explanation:
Answer:
No, so it's false you're correct.
Hope this helped
How much work must be done to raise a 1100kg car 2m above the ground?
Answer:
21560 J
Explanation:
Work = mg*h = 1100*9.8*2 = 21560 J
21560 J work must be done to raise an 1100 kg car 2m above the ground.
Work = mass * gravity * height
= 1100 * 9.8 * 2
= 21560 J
What is work done?In precis, work is carried out whilst pressure acts upon an item to purpose a displacement. 3 portions must be regarded in the way to calculate the quantity of work. The ones 3 portions are force, displacement, and the perspective between the pressure and the displacement.
Paints carried out are elaborated in this type of manner that includes both forces exerted on the body and the whole displacement of the body. This block is preceded by a steady force F. The purpose of this pressure is to move the body a certain distance d in an immediate route in the route of the pressure.
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The torque required to turn the crank on an ice cream maker is 4.50 Nm. How much work does it take to turn the crank through 300 full turns?
A) 4240 J
B) 8480 J
C) 2120 J
D) 1350 J
E) 2700 J
Answer:
B) 8480 J
Explanation:
From the question,
The work required to turn the Crank in on turn is
W = 2πT................ Equation 1
Where W = work, T = torque.
Given: T = 4.50 Nm, π = 3.14
Substitute into equation 1
W = 4.5(2)(3.14)
W = 28.26 J per turn.
For 300 full tern,
W = 28.26×300
W = 8476 J
Hence,
W≈ 8480 J.
The right answer is B) 8480 J
Jail
1. What is the momentum of a 4 kg bowling ball moving with a speed of 4 m/s?
a. 16 kg•m/s
b. 8 kg•m/s
c. O kg•m/s
d. 1 kg•m/s
Answer:
c.o Kg • ms 08
Explanation:
put all together
The answer is option c) 0 kg m/s
What is momentum ?It is a property of moving body by virtue of its mass and motion and that is equal to the product of the body's mass and velocity
momentum = mass * velocity
since , momentum is a vector quantity
in order to calculate momentum we need one of the quantity to be vector since , mass can never be vector as it is a scaler quantity we need to use velocity ( vector quantity ) not speed ( scaler quantity ) as multiplication of two scalers can never give rise to a vector quantity
so, the answer is option c) 0 kg m/s
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A cork dropped into a water filled beaker floats with volume V1 representing the portion of cork above water. When it is dropped in a beaker containing corn syrup, it floats with its volume V2 (again, the portion of cork above syrup). How do these volumes compare?A. V1 = V2.B. V1 > V2.C. V1 < V2.D. V1 ≥ V2.
Answer:
C. V1 < V2
Explanation:
The computation is shown below:
As we know that
Byoyancy force represent the displaced water weight
[tex]B = V_{in},_{w}P_{w}g[/tex]
[tex]V_{in},_{w}[/tex] denotes cork volume that inside the water
[tex]P_{w}[/tex] denotes water density
And, byoyancy force represent the displaced weight of corn syrup
[tex]B = V_{in},_{syr}P_{syr}g[/tex]
[tex]V_{in},_{syr}[/tex] denotes the cork volume that inside the water
[tex]P_{syr}[/tex] denotes syrup density
Now
[tex]P_{syr}>P_{w}\\\\V_{in},_{syr}<V_{in},_{wat}\\\\V_2>V_1 or V_1 <V_2[/tex]
Hence, the option c is correct
A skater with an initial speed of 5.90 m/s stops propelling himself and begins to coast across the ice, eventually coming to rest. Air resistance is negligible. (a) The coefficient of kinetic friction between the ice and the skate blades is 0.0500. Find the deceleration caused by kinetic friction. (b) How far will the skater travel before coming to rest
Answer:a) - 0.4905 m/s² b) distance = 35.48 m
Explanation:
Given that
The initial velocity of the skater = 5.90 m/s
kinetic friction coefficient = 0.0500
final velocity = 0 m/s(since it comes to rest)
deceleration cause by the kinetic friction = ?
we know that
F = μN
and N= mg
Therefore;
F = μ m g....................(1)
also that
F = m a........................(2)
with our common Force, F, equating (1) and (2), we have that
m a = - μ m g
a = - μ g
a = - 0.05 × 9.81
a = - 0.4905 m/s²
The deceleration cause by the kinetic friction is a = - 0.4905 m/s²
b)
The distance the skater travels before stopping
is given as
Vf² = v₀² - 2 a x
final velocity = 0 m/s(since it comes to rest)
Therefore We have that
0 = v₀² - 2 a x
x = - v₀² / 2 a
x = 5.90² / (2 x 0.4905 )
34.81/0.981
x = 35.48 m
Or
using
v²-u² = 2aS final velocity = 0 m/s(since it comes to rest)
0²-5.90² = -2×0.4905×S
34.81=0.981S
S= 34.81/0.981
S=35.48m
what is the average speed of a bird that flies 1 km in 5 hours?
Answer:
0.25 or 1/4
Explanation:
................
A Carnot engine operates between 1350 °F and 125 °F. If it rejects 55 Btu as heat, determine the work output.
a. W =68.54 Btu
b. W=145.19 Btu
c. W = 115.12 Btu
d. W=235.7 Blu
Answer:
C. [tex]W = 115.12\,Btu[/tex]
Explanation:
Thermodynamically speaking, a Carnot engine represents an entirely reversible thermal process and its energy efficiency represents the maximum theoretical efficiency that thermal machines can reach. The efficiency of the ideal thermal process ([tex]\eta[/tex]), no unit, is:
[tex]\eta = \left(1-\frac{T_{L}}{T_{H}} \right)[/tex] (1)
Where:
[tex]T_{L}[/tex] - Temperature of the cold reservoir, measured in Rankine.
[tex]T_{H}[/tex] - Temperature of the hot reservoir, measured in Rankine.
If we know that [tex]T_{H} = 1809.67\,R[/tex] and [tex]T_{L} = 584.67\,R[/tex], then the energy efficiency of the ideal thermal process is:
[tex]\eta = 0.678[/tex]
By First Law of Thermodynamics, we calculate the work output:
[tex]W = Q_{H}-Q_{L}[/tex]
[tex]W = \frac{W}{\eta} -Q_{L}[/tex] (By definition of efficiency)
[tex]Q_{L} = \frac{W}{\eta}-W[/tex]
[tex]Q_{L} = \left(\frac{1}{\eta}-1 \right)\cdot W[/tex](2)
Where:
[tex]Q_{H}[/tex] - Heat received by the engine, measured in Btu.
[tex]Q_{L}[/tex] - Heat rejected by the engine, measured in Btu.
[tex]W[/tex] - Work output, measured in Btu.
If we know that [tex]\eta = 0.678[/tex] and [tex]Q_{L} = 55\,Btu[/tex], then the work output of the Carnot engine is:
[tex]W = \frac{Q_{L}}{\frac{1}{\eta}-1 }[/tex]
[tex]W = 115.807\,Btu[/tex]
The work output of the Carnot engine is 115.807 Btu. (Answer: C)
what causes most thing to expand on heating and contracts on cooling draw a diagram to support the answer
Answer:
air and oxygen makes in bigger
Explanation:
True or False 1-10
1. When air temperature falls, the air can hold more water vapor.
2. Cloudy days tend to have a greater range of temperatures than clear days.
3. Water vapor condenses when air temperature reaches the dew point.
4. A cloud consists of billions of individual water droplets.
5. Dust or other particles are needed for clouds to form.
6. Only high clouds consist of ice crystals.
7. Stratocumulus clouds rarely bring precipitation.
8. Advection fog forms when warm humid air travels up a hillside and cools.
9. All precipitation falls from clouds.
10. Hail forms in cumulonimbus clouds with strong updrafts.
Answer:
in order of questions asked:
f
t
t
t
t
t
f
t
f
t
When air temperature falls, the air can hold more water vapor, this statement if false because air doesn't hold more water in this case.
Cloudy days tend to have a greater range of temperatures than clear days. This assertion is true.
Water vapor condenses when air temperature reaches the dew point. This assertion is true.
A cloud consists of billions of individual water droplets. This assertion is true
Dust or other particles are needed for clouds to form. This assertion is true.
Only high clouds consist of ice crystals. This assertion is true.
Stratocumulus clouds rarely bring precipitation. This assertion is false.
Advection fog forms when warm humid air travels up a hillside and cools. True.
All precipitation falls from clouds. False.
Hail forms in cumulonimbus clouds with strong updrafts. True.
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In this unit, you learned about Athenian democracy and government in ancient Greece. What were some of the main characteristics of Athenian democracy? How is Athenian democracy similar to modern democracy? How is it different? Do you think Athenian democracy would be possible in the United States today? Why or why not?
(PLEASE HELP, WORTH 70 POINTS)
under this system all male citizens had equal political rights freedom of speech and the opportunity to participate directly in the political Arena
Answer:
Today, government in the United States is most similar to the Roman Republic because it is a representative democracy.
Although Athens is known as the world's first democracy, system that exist in United States today is most similar to Roman system.
Namely, Roman Republic was choosing its officials to represent them in the bodies such as Senate, which is also the case today with United States.
Explanation:
A Gaussian surface consists of a bottom surface made of a flat disk of radius R, in the horizontal plane centered on the origin and a top surface consisting of a hemisphere of the same radius R. A dipole is arranged as show where the charges are q both plus and minus and the separation is a. a)(5 points) What is the signof the electric flux FEthrough the entire Gaussian surface
Answer:
electric flux through the entire Gaussian surface will be positive ( + )
Explanation:
The dipole is surrounded by Gaussian surface of charge q
The electric flux will be positive
i.e. Ф = E. ds since the surface is a close one the direction of the area outwardly will be positive . therefore the angle between E and A < 90°
Hence the electric flux through the entire Gaussian surface will be positive
pdf
Due date: February 22, 2021
10:00 AM EST
5: Holt SF 05Rev 43 - 10.0 pts possible
A 0.290 kg block on a vertical spring with a
spring constant of 4.65 x 103 N/m is pushed
downward, compressing the spring 0.0500 m.
When released, the block leaves the spring
and travels upward vertically.
The acceleration of gravity is 9.81 m/s.
How high does it rise above the point of
release?
Answer in units of m.
x x
please help! help! help!.. Two metal spheres of the material and of equal radius R are touching each other .show the force of attraction between them is proportional to
[tex]r {4}[/tex]
Answer:
F ∞ r^4
Explanation:
I can't really write the equation here because its complex
Hope this helps:)
Which of the following is a disadvantage of using solar energy
Please provide options.
Answer:
It requires a high initial investment
Explanation:
2. Write an expression for the work
done when a force is acting on
an object in the direction of its
displacement
Answer:
work done=Fs
Explanation:
F : force
s : displacement
by definition
A dry cell is used in a flashlight to convert to light.
a. electrical energy
b. static electricity
Answer:
Electrical energy this is because when the flashlight us turned on the chemical energy stored in the battery is converted to electrical energy that flows through the wire of the flashlight
How does Physics help you as a student?
Answer:
The goal of physics is to understand how things work from first principles. ... Courses in physics reveal the mathematical beauty of the universe at scales ranging from subatomic to cosmological. Studying physics strengthens quantitative reasoning and problem solving skills that are valuable in areas beyond physics
Answer:
you get to understand why things happen this way
Explanation:
for example, are you not curious about why when standing in the bus and when the bus stops, you will might feel like you are going to fall ,
why does this happen because....
newton's laws explains it,
inertia causes you to be reluctant to change your initial state of motion due to your mass so you fall because you are still moving at the 'speed of the bus ' , something in like that
hope this helps,
please mark also
Pls help me I’m failing
Answer:
A is the answer okkkkkkkkkkkkkkkk
How are decompression and how gasses dissolve in liquids related? Explain in your own words.
.You have always been impressed by the speed of the elevators in your apartment building. You wonder about the maximum acceleration for these elevators during normal operation, so you decide to measure it by using your bathroom scale. While the elevator is at rest on the ground floor,you get in, put down your scale, and stand on it. The scale reads 50 kg. You continue standing on the scale when the elevator goes up, carefully watching the reading. During the trip to the 10th floor, the greatest scale reading was
Answer:
5.51 m/s^2
Explanation:
Initial scale reading = 50 kg
assume the greatest scale reading = 78.09 kg
Determine the maximum acceleration for these elevators
At rest the weight is = 50 kg
Weight ( F ) = mg = 50 * 9.81 = 490.5 N
At the 10th floor weight = 78.09 kg
Weight at 10th floor ( F ) = 78.09 * 9.81 = 766.11 N
F = change in weight
Change in weight( F ) = ma = 766.11 - 490.5 (we will take the mass as the starting mass as that mass is calculated when the body is at rest)
50 * a = 275.61
Hence the maximum acceleration ( a ) = 275.61 / 50 = 5.51 m/s^2
Analyze the data to identify the mathematical relationship between the
amplitude and energy of a mechanical wave. If mechanical wave A has an
amplitude of 1 cm and mechanical wave B has an amplitude of 2 cm, what
will be the relationship between the energy carried by the two waves?
Answer:
Energy of of Wave B is four times the energy of Wave A
Explanation:
As we know, the energy carried by a wave is directly proportional to the square of the amplitude of the wave. Mathematically, this expression can be expressed as
[tex]E \alpha A^2[/tex]
Energy of wave A [tex]\alpha 1^2[/tex]
Energy of wave B [tex]\alpha 2^2[/tex]
Energy of wave A/Energy of wave B
[tex]= \frac{1^2}{2^2} \\= \frac{1}{4}[/tex]
This means that the Energy of of Wave B is four times the energy of Wave A
Answer:
Energy of of Wave B is four times the energy of Wave A
Explanation:
If you were to stand in the exact center of a rotating disc, you would only have what kind of
speed?
Tangential speed
Increasing speed
Linear speed
Rotational speed
Answer:
Tangential speed or Rotational speed
- .
?
y
(っ◔◡◔)っ ♥ chose the answer with the question marks ♥
Answer:
okay I'm a bit confused but I like the little emoji dudw
Answer:
?
Explanation:
.
An object is dropped from a bridge. A second object is thrown downwards 1.0 s later. They both reach the water 20 m below at the same instant. What was the initial speed of the second object? Neglect air resistance.
Answer:
15m/s
Explanation:
[tex]20m = \frac{1}{2} g {t}^{2} \\ t = 2s \\ t0 = 2s - 1s = 1s \\ vt + \frac{1}{2} g {t}^{2} = 20m \\ v \times 1s + \frac{1}{2} \times 10 \times 1 = 20 \\ v = 15[/tex]
The space probe Deep Space 1 was launched on October 24, 1998. Its mass was 474 kg. The goal of the mission was to test a new kind of engine called an ion propulsion drive. This engine generated only a weak thrust, but it could do so over long periods of time with the consumption of only small amounts of fuel. The mission was spectacularly successful. At a thrust of 56 mN how many days were required for the probe to attain a velocity of 790 m/s (1770 mi/h), assuming that the probe started from rest and that the mass remained nearly constant
Answer:
T = 77.5 days.
Explanation:
Assuming no other forces acting on the probe, according to Newton's 2nd law, we can find the acceleration attained by the probe due to the thrust (assumed constant) as follows:[tex]a = \frac{F}{m} = \frac{56e-3N}{474kg} = 1.18 e-4 N (1)[/tex]
Since the probe started from rest, we can express the final speed applying the definition of acceleration, as follows:[tex]v_{f} = a* t (2)[/tex]
We can solve for t (in seconds) as follows:[tex]t = \frac{v_{f}}{a} = \frac{790m/s}{1.18e-4m/s2} = 6694915 s (3)[/tex]
Since 1 day = 86400 s, we can find the time in days as follows:[tex]t_{days} = \frac{t_{sec} }{1 day} = \frac{6694915s}{86400s} = 77.5 days (4)[/tex]
DOES ANYONE KNOW HOW TO DO THIS?
Question:
Convert 68 MHz to Hz.
Answer:
68000
Explanation:
1 MHz = 1000 Hz
just multiply by 1000 :)
An object is dropped from a bridge. A second object is thrown downwards 1.0 s later. They both reach the water 20 m below at the same instant. What was the initial speed of the second object? Neglect air resistance.