A 50-kg person riding a bike puts all her weight on each pedal when climbing a hill. The pedals rotate in a circle of radius 18 cm . What is the maximum torque she exerts? Express your answer to two significant figures.
The maximum torque exerted by a 50-kg person riding a bike when putting all her weight on each pedal while climbing a hill is 88.2 Nm.
Torque is the product of force and lever arm. The maximum torque exerted by a 50 kg person riding a bike when putting all her weight on each pedal while climbing a hill is calculated using the following formula;
torque = force x lever arm
The person's weight (50 kg) is converted to Newtons.
The weight of the person can be calculated as;
mass = 50 kg
acceleration due to gravity, g = 9.8 ms-2
weight, W = mass x g
Substituting the values in the formula,
W = 50 kg × 9.8 ms-2W
= 490 N
The maximum torque is exerted when the force is perpendicular to the radius when the pedal is horizontal. The torque equation then becomes;
torque = force x lever arm
The maximum torque, T = force x lever arm
where,
force = 490 N and lever arm = 0.18 m (18 cm converted to meters)
T = 490 N x 0.18 m
T = 88.2 Nm
Therefore, the maximum torque exerted by a 50-kg person riding a bike when putting all her weight on each pedal while climbing a hill is 88.2 Nm.
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You are pulling on a rope attached to the outer radius of a pulley with a moment of inertia I = 2.85 kg-m^2 as shown. The tension force of you on the pulley is 266.3 N. A pack of mass 23.4 kg is attached to the pulley's inner radius as shown. If the inner radius of the pulley is 0.43 m and the outer radius is 0.66 m, what is the magnitude of the linear acceleration of the pack? If instead of using a pulley with two radii, you were to replace the two radii pulley with a simple pulley of one radius: how would using the simple pulley instead of the two radii pulley affect the difficulty of holding the pack at rest over the edge? It will be easier to hold the pack. Not enough information to tell. There will be no difference. It will be harder to hold the pack.
The magnitude of the linear acceleration of the pack can be calculated using the following equation:a = (T - Fr) /m where a is the magnitude of the linear acceleration of the pack,T is the tension force of you on the pulley,Fr is the frictional force, and m is the mass of the pack.Substitute the given values to the formula:a = (T - Fr) / ma = (266.3 - Fr) / 23.4.
The frictional force can be determined using the moment of inertia of the pulley.I = mr²I = 2.85 kg-m²m = I / r²m = 2.85 / 0.43²m = 15.57 kgFr = maFr = 15.57 × aa = (266.3 - 15.57a) / 23.4Solve for a by multiplying both sides by 23.4:23.4a = 266.3 - 15.57a23.4a + 15.57a = 266.3a = 266.3 / 39.97a = 6.66 m/s².
Therefore, the magnitude of the linear acceleration of the pack is 6.66 m/s².If instead of using a pulley with two radii, you were to replace the two radii pulley with a simple pulley of one radius, it will be harder to hold the pack.
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Which object is in the sample of chemical change?
* Digesting a salad
* Mixing a salad dressing
* Dicing an onion
* Preparing a salad
Can someone answer this quickly, sorry if it’s rushed. ~Ty
Answer:
Digesting a salad
Explanation:
All the other ones are physical changes because you're changing its form but not its chemical identity and not changing the substance. Digesting a salad is a chemical change because you're both changing its form AND its chemical identity
A plane flies 408 mi with the wind in 3 hr. The return trip takes 4 hr. What is the speed of the wind and the speed of the plane in still air? Part 1 of 2 The speed of the plane in still air is Part 2
The speed of the wind is 17 mph and the speed of the plane in still air is 119 mph.
Let the speed of the plane be x and the speed of the wind be y. Then, the speed of the plane with the wind becomes x + y, while the speed of the plane against the wind is x - y.
The distance traveled with the wind in 3 hours is 408 miles.
Therefore, we can write the equation as:
3(x + y) = 408
Divide both sides by 3:
x + y = 136 .... (1)
The distance traveled against the wind in 4 hours is also 408 miles.
Therefore, the equation can be written as:
4(x - y) = 408
Divide both sides by 4:
x - y = 102 .... (2)
Now we can solve these two equations using the elimination method.
Add equations (1) and (2):
x + y + x - y = 136 + 1022x = 238x = 119 mph
Therefore, the speed of the plane in still air is 119 mph.
Now, substitute this value of x in equation (1):
119 + y = 136y = 17 mph
Therefore, the speed of the wind is 17 mph.
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The correct question is:
A plane flies 408 mi with the wind in 3 hr. The return trip takes 4 hr. What is the speed of the wind and the speed of the plane in still air?
figure show the directions of magnetic field vector and magnetic force vector. find the velocity vector in each case for a positively charged particle
The magnitude of the velocity vector can be determined by calculating the centripetal acceleration of the particle and applying it to the following equation: ac = v2/r, where ac is the centripetal acceleration, v is the velocity, and r is the radius of the circular path.
When an electrically charged particle is in motion, it generates a magnetic field. The direction of the magnetic field vector is given by the right-hand rule. The right-hand rule suggests that the thumb points in the direction of the charge's velocity, the fingers curl around in the direction of the magnetic field, and the palm points in the direction of the force vector. If the particle's charge is positive, the magnetic force vector and velocity vector would be in the same direction.
The magnitude of the magnetic force is given by the equation Fm = qvB sinθ, where q is the charge of the particle, v is the velocity of the particle, B is the magnetic field, and θ is the angle between the magnetic field and the velocity vector. If the particle's velocity vector is perpendicular to the magnetic field, the angle between them is 90 degrees, and the force is the greatest. When the angle between the velocity vector and the magnetic field is zero, the magnetic force is zero, and when the angle is 180 degrees, the force is also zero.
This is because the sin(0) and sin(180) are both equal to zero.The velocity vector of a charged particle moving through a uniform magnetic field would be circular. This is due to the fact that the magnetic force vector is perpendicular to the velocity vector, which means that it constantly changes the direction of the velocity vector. The centripetal force responsible for the circular motion of the charged particle is provided by the magnetic force. The particle's velocity and magnetic field are both perpendicular to the magnetic force, resulting in circular motion.
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What happens when similar systems work together?
Answer: skeletal system and nervous systems
Explanation:
Many different body systems work together to perform daily functions in life. The skeletal system and nervous systems work together to produce movement and keep your organs functioning.
Directions: Using the T-chart below, compare balanced forces and unbalanced forces.
Balanced Forces
Unbalanced Forces
(can i please get three examples for each)
Explanation:
unbalanced: a turning vehicle, apple falling on the ground, kicking a ball
balanced: floating on water, fruit hanging from tree, tug of war equally balanced teams
a spring with a constant 585 n/m is placed vertical on the ground a 2.3 kg mass is placed on the spring and the spring is compressed 21.5 cm. the spring is released and the mass is launched directly up in the air what is the maximum height the mass reaches above its initial position
The maximum height up to which the mass reaches above its initial position is 71cm.
According to the law of conservation of energy, energy can never be created nor be destroyed so all the energy of the spring will be converted into the potential energy of the mass.
Now, we can calculate the height till which the mass will reach in the air from its initial position,
1/2Kx² = Mgh
Where,
K is the spring constant,
x is the compression in the spring,
M is the mass of the object,
g is the gravitational acceleration and,
h is the height till reach the mass will be launched in the air.
It is given to us that the spring constant is 585N/m, the mass of the object is 2.3 kg and 8 is producing a compression of 21.5cm in the spring.
Now, putting all the values to find the vertical height of the object,
1/2(585)(0.215)² = 2.3(9.8)h
h = 0.49m
h = 49cm.
So, the vertical height of the object will be 49 centimetre.
The distance from initial position is 71cm.
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how much work is done by a person lifting a 2.0-kg object from the bottom of a well at a constant speed of 2.0 m/s for 5.0 s?
Work is the same as energy. With the use of energy formula, the work done is 4 J
What is Work ?The work done on an object can be defined as the product of force and distance in the direction of the force. It is synonymous to energy and it is measured in Joule.
Given that a person lifting a 2.0-kg object from the bottom of a well at a constant speed of 2.0 m/s for 5.0 s.
The given parameters are
Mass m = 2 KgSpeed v = 2 m/sTime t = 5 sWork = Energy = 1/2mv²
W = 1/2 × 2 × 2²
W = 0.5 × 2 × 4
W = 4 Joules
Therefore, the much work that is done by the person is 4 Joules.
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Fill in the three blanks with one of the choices below: A hot dense object would produce __________ spectrum, while hot gas (i.e., hot low-density object) would produce ___________ spectrum. On the other hand, our Sun shows ______________ spectrum.
A hot dense object would produce a continuous spectrum, while hot gas (i.e., hot low-density object) would produce an emission line spectrum. On the other hand, our Sun shows an absorption line spectrum.
1. Continuous Spectrum: A hot dense object, such as a solid or a dense gas, produces a continuous spectrum. This spectrum consists of an uninterrupted range of colors or wavelengths, with no distinct lines or gaps. It appears as a smooth, rainbow-like spectrum and is characteristic of objects that emit light at all wavelengths.
2. Emission Line Spectrum: A hot gas, or a low-density object, produces an emission line spectrum. This spectrum consists of a series of bright, colored lines against a dark background.
Each line corresponds to a specific wavelength of light that is emitted when electrons in the atoms or ions of the gas transition from higher to lower energy levels. These lines are unique to the element or molecule present in the gas and can be used to identify its composition.
3. Absorption Line Spectrum: Our Sun, like many other stars, exhibits an absorption line spectrum. This spectrum consists of a continuous spectrum with dark lines superimposed on it. These dark lines, also known as absorption lines, are caused by the outer atmosphere of the Sun (the photosphere) absorbing specific wavelengths of light emitted by the hotter interior.
The absorption lines correspond to the specific wavelengths of light that are absorbed by different elements or molecules present in the Sun's atmosphere. By studying these lines, scientists can determine the chemical composition and physical properties of the Sun and other stars.
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A current of 0.050 amps flows in a circuit element with a resistance of 25 ohms what is the voltage drop across the circuit element. (use ohms law V=IR)
The voltage drop across the circuit, given that 0.05 A flows in the circuit is 1.25 V
Ohm's lawThis law states as follows:
V = IR
Where
V is the potential differenceI is the currentR is the resistorHow to determine the voltageFrom the question given above, the following data were obtained:
Current (I) = 0.05 AResistance (R) =25 ohmsVoltage (V) =?V = IR
V = 0.05 × 25
V = 1.25 V
Therefore, the voltage drop across the circuit is 1.25 V
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An object has more elastic potential energy if...
a river flows due south with a speed of 1.90 m/sm/s . a man steers a motorboat across the river; his velocity relative to the water is 4.00 m/sm/s . the river is 700 mm wide.
The time it takes the motorboat to cross the river is approximately 73.40 seconds.
The velocity of the motorboat with respect to the river is v_b = 4.00 m/s at an angle of 30° north of east with the north direction. The river flows south with velocity v_r = 1.90 m/s. The width of the river is d = 700 m. We need to find the time t it takes the motorboat to cross the river.
Step 1: Find the velocity of the motorboat with respect to the ground - The velocity of the motorboat with respect to the ground can be found using the velocity addition formula:
v_bg = v_b + v_r
where v_bg is the velocity of the motorboat with respect to the ground.
v_bg = (4.00 m/s)² + (1.90 m/s)² + 2(4.00 m/s)(1.90 m/s cos 30°)
v_bg = sqrt(22.76) m/s
v_bg ≈ 4.78 m/s
Step 2: Find the time to cross the river - The time to cross the river is given by the distance across the river divided by the component of the velocity of the motorboat with respect to the ground perpendicular to the river, which is v_bg sin 30°.
t = d / (v_bg sin 30°)
t = 700 m / (4.78 m/s)(0.5)
t ≈ 73.40 s
Therefore, the time it takes the motorboat to cross the river is approximately 73.40 seconds.
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what are projectiles
Answer:
projectiles is an object
Explanation:
projectiles moves freely under the influence of gravity and air resistance
Newton's heating-cooling law states that the rate of change in the temperature, H, is proportional to the difference between the object and the surrounding temperature. Let H(t) be the temperature of the object being cooled and S be the surrounding temperature. A warm object at 100 degrees is placed in a refrigerator at 35 degrees Fahrenheit and after 30 minutes the object is 75 degrees. Write and solve the differential equation which describes the temperature of the object over time, where time is measured in hours. OH(t)=35-65e-0.97t OH(t)=35+65e-t(0.97) OH(t)=75-35e-0.97t OH(t)=35+75e0.971
The differential equation which describes the temperature of the object over time is;
dH/dt = -k (H-S), where k = 0.97. The solution to this differential equation is given by H(t) = S + 65e^(-0.97t).
Newton’s law of heating and cooling is an application of the first law of thermodynamics. The law suggests that the rate of change of temperature of an object is proportional to the difference between its temperature and the temperature of the surroundings.
A warm object is placed in a refrigerator where the surrounding temperature is cooler, and the temperature of the object decreases. This phenomenon can be explained using differential equations. Given that H(t) is the temperature of the object being cooled and S is the surrounding temperature, the differential equation which describes the temperature of the object over time is given by;dH/dt = -k (H-S)
where k is the constant of proportionality.To solve this differential equation, we can use separation of variables, such that;
dH/dt = -k (H-S)dH/(H-S) = -k dt
Integrating both sides, we get;ln|H-S| = -kt + Cwhere C is the constant of integration.Rearranging, we have;
|H-S| = e^(-kt+C)
At time, t = 0, H = 100 and after 30 minutes the object is 75 degrees; t = 0.5 hours, H = 75. We can use these values to solve for C and k as follows;
|100-35| = e^(C) => 65 = e^(C) …(1)
and|75-35| = e^(-0.5k+C) => 40 = e^(C) e^(-0.5k) => e^(-0.5k) = 40/65 => e^(-0.5k) = 8/13 => -0.5k = ln(8/13) => k = -2ln(8/13) => k = 0.97 …(2)
Substituting equation (1) into (2), we get;H-S = 65e^(-0.97t) => H(t) = S + 65e^(-0.97t)
Therefore, the differential equation which describes the temperature of the object over time is;dH/dt = -k (H-S), where k = 0.97.
The solution to this differential equation is given by H(t) = S + 65e^(-0.97t).
The differential equation which describes the temperature of the object over time is;
dH/dt = -k (H-S), where k = 0.97. The solution to this differential equation is given by H(t) = S + 65e^(-0.97t).
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(03.04 MC)
If the distance between two charged particles is doubled, the force between them changes by a factor of...
1/2
1/4
2
4
Answer:
1/4
Explanation:
If the distance between two charges is doubled, the attraction of repulsion between the two becomes weaker, and decreases to 1/4 of the original value.
True or false? An object that is accelerating is always speeding up or slowing down.
Answer:
True
Explanation:
If acceleration points in the same direction as the velocity, the object will be speeding up. And if the acceleration points in the opposite direction of the velocity, the object will be slowing down.
Hurry pls. Will make correct answer brainliest !!
a dump truck contains a load of soil. Which action will decrease the dump
truck's inertia?
A. Decrease the force applied by the engine.
B. Dump out some of the soil.
C. Increase its speed.
D. Add more soil.
Inertia is the resistance of an object to a change in its state of motion. The more mass an object has, the more inertia it has. Correct answer: B. Dump out some of the soil.
Therefore, by dumping out some of the soil from the truck, the mass of the truck is decreased, which in turn decreases its inertia.
Option A, decreasing the force applied by the engine, will not affect the truck's inertia. Option C, increasing its speed, will also not affect the truck's inertia, as inertia is only dependent on mass. Option D, adding more soil, will actually increase the truck's inertia, as it will increase its mass.Therefore, the correct answer is option B.
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Explain why the magnifying glasses made from transparent materials?
Transparent materials are preferred for magnifying glasses because they allow light to pass through, resulting in clear and accurate images with natural colors. The quality of the material used is also important for achieving clarity and preventing distortion.
Magnifying glasses are typically made from transparent materials such as glass or plastic because they need to allow light to pass through them to form an image. When light passes through a transparent material, it refracts or bends, which is what allows the lens to focus the light onto a small point.
The quality of the material used to make the magnifying glass is important as it affects the clarity and sharpness of the image produced. The material should be free from impurities and scratches to prevent distortion of the image.
Transparent materials are also preferred for magnifying glasses because they allow us to see the object being magnified in its natural colors. If the material were opaque, the colors would be distorted or blocked altogether, making it difficult to see the object clearly. Overall, using transparent materials for magnifying glasses allows for clear, sharp images with accurate colors, making them ideal for a wide range of applications.
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When the pressure is 1.00 atm What is the volume of the gas?
The required volume of the gas is 0.52 L.
What is relation between pressure and volume of the gas?Diminishing the volume of a contained gas will expand its tension, and expanding its volume will diminish its strain. As a matter of fact, on the off chance that the volume increments by a specific variable, the tension declines by a similar element, as well as the other way around.
According to question:V1 = 1.56 L, P1 = 1 atm, P2 = 3 atm,
To find: V2 of gas
So, P1V1 = P2V2
V2 = P1V1/P2
V2 = 1.56(1)/3 = 0.52 L
Thus, required volume of gas is 0.52L
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Correct question:
A gas occupies 1.56 l at 1.00 ATM what will be the volume of this gas if the pressure becomes 3.00 ATM
The bearing of grids of an AB alignment is 100º 22', while the magnetic declination is 8º30' E. What are the true azimuth, magnetic azimuth, and grid azimuth of this alignment?
The true azimuth of the AB alignment is 91º 52' (east of north), the magnetic azimuth is 100º 22' (east of north), and the grid azimuth is 108º 52' (east of north).
To find the true azimuth, magnetic azimuth, and grid azimuth of the AB alignment, we need to consider the magnetic declination. The magnetic declination indicates the angle between true north and magnetic north at a specific location. In this case, the magnetic declination is 8º 30' E, which means that the magnetic north is 8º 30' east of the true north.
To calculate the true azimuth, we subtract the magnetic declination from the grid azimuth. The grid azimuth is given as 100º 22', so subtracting the magnetic declination of 8º 30' E gives us a true azimuth of 91º 52' (east of north).
The magnetic azimuth remains the same as the grid azimuth, which is 100º 22' (east of north).
The grid azimuth is calculated by adding the magnetic declination to the true azimuth. Since the magnetic declination is east, we add it to the true azimuth. Adding 8º 30' E to the true azimuth of 91º 52' gives us a grid azimuth of 108º 52' (east of north).
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The human nerve cells have a net negative charge and the material in the interior of the cell is a good conductor. if the cell has a net charge of - 7.85 pc, what are the magnitude and direction (inward or outward) of the net flux through the cell boundary
The magnitude and direction (inward or outward) of the net flux through the cell boundary is - 0.887 wb.m².
What is flux?
Flux describes any effect that appears to pass or travel through a surface or substance.
The magnitude and direction (inward or outward) of the net flux through the cell boundary is calculated as follows;
Ф = Q/ε
where;
Q is net chargeε is permittivity of free spaceΦ = (-7.85 x 10⁻¹²)/(8.85 x 10⁻¹²)
Φ = - 0.887 wb.m²
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How do you find mass in physics
Is this compound Ionic or Covalent? fr2o
Answer:
it is an ionic compound
Explanation:
What's the difference between a tornado and a hurricane?
Answer:
hurricanes last longer that tornadoes
Question 10 of 10
Two particles are separated by 0.38 m and have charges of 1.25 x 10-9C and
1.92 * 10-°C. Use Coulomb's law to predict the force between the particles if
the distance is doubled. The equation for Coulomb's law is F = kouse, and
the constant, k equals 9.00 x 109 Nm²/C2
A. -1,50x10-7N
B. -3.74 x 10-8N
C. 1,50 x 10-7N
D. 3.74 x 10-8N
SUBMIT
Answer:
Its d 3.74 x 10-8N
Explanation:
Answer: 3.74 x 10-8 N
Explanation:
how does the eye control the amount of light entering it?
Answer: Hello there
Explanation:
The colored part of the eye which helps regulate the amount of light entering the eye. When there is bright light, the iris closes the pupil to let in less light. And when there is low light, the iris opens up the pupil to let in more light. Focuses light rays onto the retina.
A washing machine’s two spin cycles are 328 rev/min and 542 rev/min. The diameter of the drum is 0.43 m.
a. What is the ratio of the centripetal accelerations for the fast and slow spin cycles? Recall that ac=v2r
and v = rω
b. What is the ratio of the linear velocity of an object at the surface of the drum for the fast and slow spin cycles?
c. Find the maximum centripetal acceleration in terms of g for the washing machine.
#1
\(\\ \tt\rightarrowtail \dfrac{a_1}{a_2}=\dfrac{(v1)^2r}{(v2)^2r}\)
putting v=rw\(\\ \tt\rightarrowtail \dfrac{a_1}{a_2}=\dfrac{r^3\omega_1^2}{r^3\omega_2^2}\)
Cancel r^3\(\\ \tt\rightarrowtail \dfrac{a_1}{a_2}=\dfrac{(328)^2}{(542)^2}\)
\(\\ \tt\rightarrowtail a_1:a_2=107584:293764\)
#2
\(\\ \tt\rightarrowtail v_1:v_2=328:542=164:271\)
please help will give brainlyest
How does the compass react to being away from the magnetic bar?
Answer:
When you take the compass away from the bar magnet, it again points north. So, we can conclude that the north end of a compass is attracted to the south end of a magnet. ... In Experiment 2, when you move the north pole of a magnet toward the south pole of the other magnet, the two magnets attract.