calculatetheresistiveforcesactingonasportscarifitistreavellingatasteadyspeedof25m/swhentheengineisproviding200kw
Answers
The resistive forces acting on the sports car are 8,000 N.
Why does resistance force exist?A force that works in opposition to a body's motion is called resistance, or the vector sum of many forces. A measure of the resistance to current flow in an electrical circuit is called electrical resistance. An electrical circuit needs resistance to transform electrical energy to light, heat, or movement.
What are the three forces of resistance?We will examine three different resistive force models, suitable for various circumstances: friction, viscosity, and drag.
In what ways is resistive force measured?Multiplying the effort force by the separation between the effort and the fulcrum, then dividing by the separation between the fulcrum and the resistance, yields the resistance force.
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Related Questions
Does the mass of an object always equal the sum of its parts?
yes
no
Answers
slow break style requires this type of action
Answers
Answer:
It is characterized by fast, quick passes down the court and using more players on the attack than the opposition has for their defense. Slower, more deliberate play characterizes the slow-break style. This technique calls for more thoughtful action; players maneuver carefully in order to shoot in this type of offense.
The small capillaries in the lungs are in close contact with the alveoli. A red blood cell takes up oxygen during the 0. 75 s that it squeezes through a capillary at the surface of an alveolus. What is the diffusion time for oxygen across the 2. 0- μm -thick membrane separating air from blood? Assume that the diffusion coefficient for oxygen in tissue is 1. 1×10−11m2/s?
Answers
The diffusion time for oxygen across the 2.0-μm-thick membrane separating air from blood is approximately 3.64 × 10^-5 s.
The Oxygen Diffusion Time.The diffusion time for oxygen across the 2.0-μm-thick membrane can be calculated using Fick's law of diffusion:
J = -D * (ΔC/Δx)
Where:
J = rate of diffusion
D = diffusion coefficient
ΔC/Δx = concentration gradient
Assuming that the concentration gradient across the membrane is constant, we can simplify the equation to:
t = x^2 / (2D)
Where:
t = diffusion time
x = thickness of the membrane
Substituting the given values:
t = (2.0 × 10^-6 m)^2 / (2 × 1.1 × 10^-11 m^2/s)
t = 3.64 × 10^-5 s
Therefore, the diffusion time for oxygen across the 2.0-μm-thick membrane separating air from blood is approximately 3.64 × 10^-5 s.
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Parachutists are hurt when jumping on the moon's surface,why?
Answers
Answer:
It's all about Gravity. When parachutists jump and open the parachute, the parachute increases the air resistance due to which acceleration due to gravity decreases, thus parachutists land safely without getting hurt.
All the planets revolve around the sun in the same direction, except for venus and uranus.
a. true
b. false
Answers
The following statement “All the planets in our solar system, except for Venus and Uranus, revolve around the Sun in the same direction. ” is false.
The majority of planets, including Earth, Mars, Jupiter, Saturn, and Neptune, orbit the Sun counterclockwise when viewed from above the Earth's North Pole. This direction is often referred to as prograde or direct motion.
However, Venus and Uranus have unique rotational characteristics. Venus rotates on its axis in a clockwise direction (referred to as retrograde or opposite motion) compared to its orbit around the Sun. Uranus, on the other hand, has an extreme axial tilt, causing it to essentially roll on its side as it orbits the Sun. This unique orientation means that Uranus also appears to rotate in a retrograde or opposite direction.
So, in summary, while most planets in our solar system revolve around the Sun in the same counterclockwise direction, Venus and Uranus have different rotational characteristics and orbit in a retrograde or opposite direction compared to the other planets.
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A ball is thrown upward with an initial velocity of 20ft/s.
a ) What is the acceleration of the ball on its way up?
b ) what is the velocity of the ball at the very top of its path?
c) what is the acceleration of the ball on its way down?
Answers
Answer: the acceleration is 63737737ey
the velpcoty is is 7-922=2929
the acceleration down is 99102>2929<92
Explanation: because when the ball goes up it has to come down due to gravity, physics, and your very kind and nice mother. I hope this helped you! i bet you will ace this assignment.
When floating a ping-pong ball with a hairdryer, which two forces are balanced?
Force pushing up:
Force pulling down:
Answers
The force of air that’s coming from hairdryer which is pushing ping pong ball upwards.
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If the displacement of a person from their desk is 27 m, 17° S of W, how far west are
they from their desk?
Answers
If the displacement of a person from their desk is 25.92 m if 27 m, 17° S of W, they are west from desk.
Resolving the 27 m distance into its horizontal and vertical components. The horizontal component will describe how far west they are and the vertical component will describe how far south they are. After resolving the components make a right angled triangle.
cos θ = Adjacent side / Hypotenuse
θ = 17°
Adjacent side = Horizontal component
Hypotenuse = 27 m
cos 17° = West distance / 27
West distance = 0.96 * 27
West distance = 25.92 m
In a right angled triangle some of the ratios similar to the one used above can be used. These ratios are called as trigonometric ratios. These ratios use trigonometric functions and relate them to sides of a right angled triangle.
Therefore, they are 25.92 m west from the desk.
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An alarm emits sound of power 0.51 w uniformly in all directions. how much energy passes through a rectangle 20 m from the alarm in one minute? the dimensions of the rectangle are 3.0 m by 4.0 m.
Answers
Approximately 0.1457 Joules of energy pass through the rectangle in one minute.
The intensity of a sound wave is the power per unit area. To find the intensity at the given distance, we can use the inverse square law. Since the power is uniformly distributed in all directions, we can consider a sphere with radius \(20 m\) centered at the alarm. The area of the sphere is \(4\pi r^2\), and the intensity is power divided by the area.
\(Intensity = Power / (4\pi r^2)\)
\(= 0.51 W / (4\pi (20)^2)\)
\(= 0.000203 W/m^2\)
Now we can calculate the energy passing through the rectangle in one minute. First, we need to find the total energy passing through the rectangle per second.
Energy per second = Intensity × Area of the rectangle
\(= 0.000203 W/m^2 x (3.0 m x 4.0 m)\)
\(= 0.002428 W\)
Finally, we can calculate the total energy passing through the rectangle in one minute.
Energy = Energy per second × 60 seconds
\(= 0.002428 W x 60 s\)
\(= 0.1457 J\)
Therefore, approximately 0.1457 Joules of energy pass through the rectangle in one minute.
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Write any two differences between electromagnets and permanent
magnets
Answers
The two differences between electromagnets and permanent
magnets are as follows:
Electromagnet exhibit the following:
temporary magnetization. They are made of soft magnetic materials.Permanent magnets exhibit the following:
permanent magnetization. They are made of hard magnetic materials. What are electromagnets?This refers to a temporary magnet produced by winding a wire around an iron core.eg.Motors, generators, Loudspeakers, headphones, Relays, Transformers, Actuators such as valves etc.
What are permanent magnets?his refers to a magnet that maintains its magnetism after the magnetizing force has been removed. eg cobalt, nickel, iron, and some alloys.
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Please please help me :)
Answers
Answer:
Explanation:
2) From F=ma
Force =15×40=600N or kgm/s2
3)From the same equation making acceleration the subject of the formula will give
a=f÷m
=24÷4=6m/s2
4)m=f÷a
=45÷15=3kg
A force of 500N acts on a body of mass 10kg such that its velocity changes from vi to vf in 20s than the rate of change of momentum will be equal to A.500N B.50N C.250N D.200N
Answers
Answer:
i m not confirmed but i think answer is 250
Explanation:
F=500N M=10KG t=20sec p=f*m/t p=500*10/20 p=250
Answer:
A. 500N
Explanation:
Using Impulse Momentum Theorem
F = m * a --------- (1)
where a = Δv / t
Δv = change of velocity
t = time
F = 500N
m = 10kg
t = 20s
using equation 1
500 = 10 * Δv / 20
500 * 20
Δv = ------------- = 1000 m/s
10
check:
impulse = change of momentum
therefore, Ft = Δ(m*v)
10 (1000)
F = --------------
20
F = 500 N
you are using a 50-mm-focal-length lens to photograph a tree. if you change to a 100-mm-focal-length lens and refocus, the image height on the detector changes by a factor of
Answers
The image height on the detector will change by a factor of 2 if you change from a 50-mm-focal-length lens to a 100-mm-focal-length lens and refocus.
The magnification of a lens is given by the ratio of the image height to the object height. Since the object height remains the same, the change in magnification is solely determined by the change in focal length.
The magnification of a lens is given by the formula:
Magnification = - (image distance / object distance).
Since we are only interested in the ratio of image heights, we can ignore the negative sign.
For the 50-mm lens, the magnification is:
Magnification1 = 50 mm / object distance.
For the 100-mm lens, the magnification is:
Magnification2 = 100 mm / object distance.
Taking the ratio of the two magnifications:
Magnification2 / Magnification1 = (100 mm / object distance) / (50 mm / object distance) = 100 mm / 50 mm = 2.
Therefore, the image height on the detector changes by a factor of 2 when switching from a 50-mm-focal-length lens to a 100-mm-focal-length lens and refocusing.
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1) A plane whose airspeed is 220 km/h heads due
north. It suddenly encounters a 150 km/h cross wind
blowing due east. What is the resulting velocity of
the plane with respect to the ground?
Answers
Answer:
=(220^2 +150^2)
/
put this on a square root
for you to get 266.2705391
round it to a whole number =266km/h
Explanation:
p
A cart moving at a constant speed of 25 m/s possesses 438 J of kinetic energy what is the mass?
Answers
A cart moving at a constant speed of 25 m/s possesses 438 J of kinetic energy, and the mass of the car is 1.6 kg.
What is kinetic energy?The energy an object has as a result of motion is known as kinetic energy. A force must be applied to an object to accelerate it. We must put in the effort to apply force. After the work is finished, energy is transferred to the item, which then moves at a new, constant speed.
What does "constant speed" refer to?Definition: When an object is moving at a constant speed—that is, its speed does not change—we say it is moving at a constant speed. steady rate
Given:
KE = 500 J
v = 25 m/s
The formula for Kinetic Energy is given:
KE = ½ mv²
where: KE - Kinetic Energy
m - mass
v - velocity
Substituting the value of KE and v in the formula,
500 J = (½)(m)(25 m/s)²
m = (500 J)(2)/(25 m/s)²
m = 1.6 kg
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An incandescent nightlight bulb costs only $.50, lasts three years and uses $0.75 of electricity each year. An LED lightbulb costs $4, lasts eleven years, and uses $0.20 of electricity a year. If the discount rate is 12%, which is the better choice?
Answers
To determine which choice is better, we need to calculate the present value (PV) of the costs associated with each lightbulb.
Let's start with the incandescent bulb. The cost of the bulb is $0.50, and it lasts for three years. Each year, it uses $0.75 of electricity. The discount rate is 12%.
To calculate the present value of the electricity cost for each year, we can use the formula
PV = C / (1 + r)^t,
where C is the cost, r is the discount rate, and t is the number of years. Plugging in the values, we have:
PV = $0.75 / (1 + 0.12)^1 + $0.75 / (1 + 0.12)^2 + $0.75 / (1 + 0.12)^3
Calculating this gives us a present value of $1.89 for the electricity cost.
Next, let's calculate the present value of the LED bulb. The cost of the bulb is $4, and it lasts for eleven years. Each year, it uses $0.20 of electricity.
Using the same formula as before, we can calculate the present value of the electricity cost for each year:
PV = $0.20 / (1 + 0.12)^1 + $0.20 / (1 + 0.12)^2 + ... + $0.20 / (1 + 0.12)^11
Calculating this gives us a present value of $1.18 for the electricity cost.
Now, we can compare the present values of the costs for each lightbulb. The incandescent bulb has a present value of $1.89, while the LED bulb has a present value of $1.18.
Since the present value of the LED bulb is lower, it is the better choice. The LED bulb is more cost-effective in the long run, even though it has a higher upfront cost. It lasts longer and uses less electricity, resulting in lower overall costs.
In conclusion, the LED lightbulb is the better choice based on the calculations of present value. It offers long-term savings due to its longer lifespan and lower electricity usage.
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Suppose a city with population 800,000 has been growing at a rate of 8% per year. If this rate continues, find the population of this city in 24 years.
The population in 24 years will be approximately (Round to the nearest whole number as needed.)
Answers
Answer:
2,336,000
800,000 × 0.08 = 64,000
800,000 + (64,000×24)
A ball is dropped from a window 24M high how long will it take to reach the ground
Answers
Answer: 2.448 seconds
Explanation: it should take about 2.448 seconds, 2.45 if to nearest 100th, or 2.4 if to nearest tenth or just 2 seconds if rounded to the nearest whole number, earth's gravity is 9.8 m/s. 24 / 9.8 = 2.448979591.
The burning of a log releases the logs chemical_energy into other forms of energy
Answers
Answer:
When we burn wood we are releasing solar energy, in the form of heat, that has been stored in the wood as chemical energy. The process of photosynthesis converted solar energy, water and carbon dioxide into oxygen and the organic molecules that form the wood, half the weight of which is carbon.
Explanation:
hand pushes on table with force of 35 N forward. whats the reaction force
Answers
Answer:
i think it is newtons third law of motion but i'm not sure sorry.i just really need point i don't know the answer.
Explanation:
Calculate the momentum of a 2500 kg truck traveling 110 km/h
Answers
Answer:
275000
Explanation:
momentum = mass * velocity
2500*110=275000
A girl attempts to swim directly across a stream 15meters wide. When she reaches the other side, she is15 meters downstream. The magnitude of herdisplacement is closest to
Answers
=
√
15
2
+
15
2
x
=
15
√
2
QED.
One drops a penny from top of the Empire State Building on the ground below. The hight of the Empire State Building is 443m How long will it take for a penny yo strike the ground assuming no air resistance
Answers
Answer:
See below
Explanation:
Assuming no resistance
DISTANCE = 1/2 a t^2
443 = 1/2 (9.81)t^2 Shows t = 9.5 seconds
You have a cup with 50cm filled with water. How much pressure will the water act on the bottom of the cup? The density of water is 1000kg/m^3 and g = 10N/kg
Answers
Answer:
5000 N/m².
Explanation:
The following data were obtained from the question:
Density (d) = 1000 kg/m³
Acceleration due to gravity (g) = 10 N/kg
Height (h) = 50 cm = 50/100 = 0.5 m
Pressure (P) =.?
Pressure is related to density and height by the following equation:
P = dgh
Where
P is the pressure.
d is the density.
g is the acceleration due to gravity.
h is the height.
With the above formula, we can obtain the pressure at the bottom of the cup as follow:
P = dgh
P = 1000 x 10 x 0.5
P = 5000 N/m²
Therefore, the pressure at bottom of the cup is 5000 N/m².
How fast would you (70kg) need to run in order to have the same momentum as a car (750kg) driving at 5 km/hr?
Answers
From the calculations and the data provided, the speed is obtained as 15 m/s
What is momentum?The term momentum refers to the product of mass and velocity. Given that we can now proceed with the answer.
Since;
p = mv
m = 750kg
v = 5 km/hr or 1.4 m/s
p = 750kg * 1.4 m/s
p = 1050 kgm/s
If the mass of the body is 70kg, the speed is
v = p/m
v = 1050 kgm/s/70 Kg
= 15 m/s
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In the product 602, what does the coefficient mean?
O There are 12 molecules of O2,
O There are 8 molecules of O2,
O There are 6 molecules of O2.
O There are 2 molecules of O2.
Answers
Answer:
c. there are 6 molecules of O2
Explanation:
Answer:
yup what he said
Explanation:
Ill give brainliest! 1. Which item below describes a quick change to
Earth's landscape?
A. a stone becoming smooth
B. dirt moving down a steep hill
C. flat land becoming a canyon
D. a glacier flattening the land below it
Answers
Answer:
hmmmmm
Explanation:
I am gonna say D.
if I am right plz give me a brainliest
What patterns did you notice when comparing the interactions between the tape and van de Graaff generator to the tape and charged balloon?
Answers
The negatively charged van de Graff generator can make a flow of electrons through the tape and these both will repel each other. When the tape comes in contact with the balloon, the positive charges of balloon gets attracted and they stick together.
What is van de Graff generator?Electrons are drawn from the earth by a Van de Graaff generator, transported via a belt, and then stored on the big sphere. These electrons are attracted to one another and try to distance themselves from one another by dispersing throughout the surface of the sphere.
Electrons can spread out widely on the earth, thus they will choose the shortest route possible to return to the ground. The electrons from the tape repel the electron from the tape, make the tape negatively charged.
This negatively charged tape when comes in contact with the balloon, it will polarize the balloon and its positive charges aligns with the tape's charge and gets stuck.
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A toy airplane is flying at a speed of 3 m/s with an acceleration of 1.1 m/s squared how fast is it flying after five seconds
Answers
Answer:
\(8.5\frac{m}{s}\)
Explanation:
Use Kinematics:
\(v = v_0 + at\)
\(v = 3 + 1.1 * 5\)
\(v = 8.5 \frac{m}{s}\)
5. A 10 kg mass is lifted to a height of 2 m. What is its potential energy at this position? Given Formula
Substitution Answer (with units)
Answers
The potential energy at this position is 196 joules.
What is potential energy ?
potential energy stored in energy that depends upon to the relative position of the various parts of a system. A spring has more potential energy when it is the compressed or stretched. A steel ball has more potential energy raised above the ground than it has the after falling to Earth.
Sol-
m=10kg h=2m Ep=mgh Ep=(10kg)(9.8 m/sec2)(2m)
Ep=196J.
The formula for potential energy depends on the force acting on the two objects. For the gravitational force the formula is P.E. = mgh, where m is the mass in kilograms, g is the acceleration due to gravity (9.8 m / s2 at the surface of the earth) and h is the height in meters.
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