According to a newspaper account, a paratrooper survived a training jump from 1200 ft when his parachute failed to open but provided some air resistance by ï¬apping unopen in the wind. allegedly he hit the ground at 100 mi/h after falling 8 seconds. test the accuracy of this account.
Determining the plausibility of a paratrooper hitting the ground at 100 mi/h after an 8-second fall involves examining the concept of terminal velocity and the effects of air resistance on falling objects.
Explanation:The question concerns a paratrooper's descent with a malfunctioning parachute and whether it's plausible for him to hit the ground at 100 mi/h after falling for 8 seconds. To test the accuracy of this account, we must look at the forces involved and the terminal velocity a parachutist can reach. For example, a skydiver with a mass of 75 kg can achieve a terminal velocity of about 350 km/h in a headfirst position, which corresponds to minimizing the area and therefore the drag. Transitioning to a spread-eagle position can decrease this velocity to about 200 km/h, increasing air resistance due to a larger cross-sectional area. However, after a parachute opens, the terminal velocity becomes much smaller. This means that if the parachute provided any air resistance, it's unlikely the paratrooper would be traveling at 100 mi/h (which is approximately 160 km/h) after just 8 seconds.
The paratrooper's reported fall seems plausible as the calculated average acceleration, considering air resistance, is 5.59 m/s².
A paratrooper is reported to have survived a fall from 1200 ft after his parachute failed to open. To verify this account, let's calculate the following:
1. Terminal Velocity Calculation
The paratrooper fell for 8 seconds and allegedly hit the ground at 100 mi/h.
First, convert the velocity and time:
Velocity, v = 100 mi/h = 44.7 m/s
Time, t = 8 s
2. Average Acceleration
We can use the equation of motion, v = u + at where:
u = initial velocity (0, since he started from rest)
v = final velocity (44.7 m/s)
a = acceleration
t = time (8 s)
Rearranging for acceleration, we get:
a = (v - u) / t = 44.7 m/s / 8 s = 5.59 m/s2
3. Free Fall and Air Resistance
In a vacuum, the paratrooper would fall under a gravitational acceleration of 9.8 m/s². Given our acceleration is 5.59 m/s², air resistance played a significant role, slowing his acceleration.
Conclusion
The report's accuracy seems plausible given the average acceleration calculated. However, other factors like the angle of impact and ground conditions would also have contributed to his survival.
The cable is drawn into the motor with an acceleration of 7 m/s2 determine the time needed for the load at b to attain a speed of 10 m/s, starting from rest.
Using the basic equation of motion v = u + at, and considering the load starts from rest (u=0), we find it takes approximately 1.43 seconds for the load to attain a speed of 10 m/s when accelerating uniformly at 7 m/s².
Explanation:The student wants to know the amount of time it takes for a load at point B to achieve a speed of 10 m/s, given that it starts from rest and accelerates uniformly at a rate of 7 m/s². This problem can be solved using one of the basic equations of motion, specifically, the formula v = u + at, where v is the final velocity, u is the initial velocity, a is the acceleration, and t is the time. Since the load is starting from rest, u = 0. Hence, the equation becomes v = at. Substituting the given values (v = 10 m/s, a = 7 m/s²), we can solve for t = v / a, which gives t = 10 / 7 = 1.43 seconds. So, it will take approximately 1.43 seconds for the load to attain a speed of 10 m/s.
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An increase in wind speed will cause the temperature of a leaf to ______. assume all other parameters of the leaf environment remain unchanged.
A gas is cooled from 365 K to 285 K while its volume changes from 12.8 L to 9.9 L. The initial pressure of the gas is 1.9 atm.
Your skeleton. It is there for support, protection, and movement. But you could not move your bones without the help of your ______________ system. A) digestive B) gland C) immune D) muscular\
Henry takes a boat ride for 15 minutes to reach his destination. If the boat was traveling at 6 meters/second, how far did the boat travel?
Answer: The distance traveled by boat is 5400 meters.
Explanation:
Speed is defined as the ratio of distance traveled to the time taken.
To calculate the distance traveled by boat, we use the equation:
[tex]\text{Spped of the boat}=\frac{\text{Distance traveled}}{\text{Time taken}}[/tex]
We are given:
Speed of the boat = 6 m/s
Time taken = 15 mins = 900 s (Conversion factor: 1 min = 60 s)
Putting values in above equation, we get:
[tex]6m/s=\frac{\text{Distance traveled by boat}}{900s}\\\\\text{Distance traveled by boat}=(6m/s\times 900s)=5400m[/tex]
Hence, the distance traveled by boat is 5400 meters.
An airplane went from 120 m/s to 180 m/s in 4.0 seconds. What was its acceleration?
Consider a box sitting in the back of a pickup. The pickup accelerates to the right, and because the bed of the pickup is sticky, the box does not slide around the truck when this happens.What direction is the force acting on the box due to the truck?
The force acting on a box in the back of a pickup truck, which accelerates forward, is due to static friction and is directed forward. This force ensures the box accelerates at the same rate as the truck, preventing it from sliding.
Explanation:When a pickup truck accelerates forward, the force acting on a box due to the truck is directed forward. This force is the result of static friction between the box and the bed of the truck. The static friction force prevents the box from slipping by providing the necessary force to accelerate the box at the same rate as the truck. If the truck accelerates to the right, the frictional force acting on the box is also to the right. This force is a reaction to the box's tendency to remain in its state of rest, according to Newton's first law of motion, which says that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force.
The calculation of the maximum distance the truck can travel without the box sliding involves determining the static frictional force and using it to find the acceleration of the box. Given the coefficient of static friction (μ) is 0.24, and assuming the acceleration of gravity (g) is approximately 9.8 m/s², we use the equation for static friction F_s = μ N, where N is the normal force, equivalent to the weight of the box if we assume a horizontal surface and neglect air resistance.
The key to understanding this problem lies in recognizing the role of static friction in causing the box to accelerate together with the truck, rather than sliding. If the bed of the truck provides sufficient friction, it enables the box to move as one with the vehicle, demonstrating the practical application of Newton's laws of motion.
The force acting on the box due to the truck is directed to the right.
When the pickup truck accelerates to the right, a force is exerted on the box due to the truck bed's friction. Since the bed of the truck is sticky, the box does not slide. The direction of the frictional force acting on the box is also to the right, in the same direction as the truck's acceleration.
Here's a step-by-step explanation:
The truck accelerates to the right.The surface of the truck bed exerts a frictional force on the bottom of the box to prevent it from sliding.This frictional force acts to the right, matching the truck's acceleration direction.According to Newton's third law of motion, every action has an equal and opposite reaction, so the box exerts a force back on the truck bed, but this doesn’t change the direction of the frictional force acting on the box.Therefore, the force acting on the box due to the truck is to the right.
The peripheral nervous system consists of __________ that link the central nervous system with all parts of the body.
What wave phenomenon is responsible for the sunlight shown in this diagram? A.)Diffraction, because light is bent around the clouds B.)Refraction, because the light bends through the clouds C.)Absorption, because the sunlight is absorbed by the clouds D.)Transmission, because the sunlight travels through the clouds
A.)Diffraction, because light is bent around the clouds
Category 5e twisted pair can run farther than 100 meters from its source to its final destination, as long as the signal is regenerated at least every ____ meters.
What is the weight in newtons of an object that has a mass of 610 mg?
If earth had no landmasses, then the idealized zonal precipitation pattern would have _______.
If the planet earth has no land masses, the idealized zonal precipitation pattern would likely have regions that are wet in the equator and there will be more of mid-latitudes if the earth has no land masses at all and it does not exist.
This igneous rock contains flattened pieces of pumice and small crystals of quartz and feldspar. what type of eruption probably formed this rock?
Final answer:
The igneous rock in question, characterized by the presence of flattened pumice and small quartz and feldspar crystals, was likely formed by an explosive volcanic eruption. This is evidenced by the extrusive nature of pumice and the rapid cooling inferred from the small crystal sizes.
Explanation:
The igneous rock described contains flattened pieces of pumice and small crystals of quartz and feldspar. The presence of pumice, which is a vesicular felsic igneous extrusive rock with a very low density such that it can float on water, indicates that the rock was formed during an explosive volcanic eruption. This type of eruption releases lava that cools very quickly on the surface of the Earth, trapping gases within the rock and creating the vesicles or holes that define pumice. Hence, the rock exhibits characteristics of an extrusive igneous rock.
Moreover, the small crystal sizes of quartz and feldspar suggest rapid cooling as well. Large crystals are typically indicative of slow cooling within the Earth's crust, a feature of intrusive igneous rocks like granite. Given these characteristics, it is evident that the rock formed from an explosive eruption, which would have caused the rapid cooling and trapping of gas that are evident in the presence of pumice.
In what way do acids affect your body?
If for 1.00 inch there are 2.54 cm, then how many centimeters are in 4.00 ft
To convert 4.00 feet to centimeters, multiply 4.00 feet by 12 inches per foot to get inches, then multiply the result by 2.54 to convert inches to centimeters. The result is 121.92 centimeters.
To convert 4.00 feet to centimeters, you can use the conversion factors and the chain link method. First, you need to know the basic conversion factors, which are 2.54 cm in 1 inch and 12 inches in 1 foot. Using these conversions:
Convert feet to inches: 4.00 ft ×12 in/ft = 48.00 in
Then convert inches to centimeters: 48.00 in ×2.54 cm/in = 121.92 cm
Therefore, there are 121.92 centimeters in 4.00 feet.
A ball rolls 6.0 meters as its speed changes from 15 meters per second to 10 meters per second. What is the average speed of the ball as it rolls the 10 meters? 1) 2.5m/s 2) 10m/s 3) 12.5m/s 4) 15m/s (Please show calculation)
The average speed of the ball cannot be accurately determined without the total time or rate of deceleration. However, if we are simply looking for the average of the initial and final speeds, it would be 12.5 m/s.
The question involves calculating the average speed of a ball given its initial and final speeds. However, there is a discrepancy in the question as it initially mentions the ball rolls 6.0 meters but then asks for the average speed over 10 meters. Assuming the correct distance is 6.0 meters, the calculation of average speed requires us to know the total distance traveled and the total time taken.
To find the average speed, we use the formula:
Average Speed = Total Distance ÷ Total Time
The total distance traveled by the ball is given as 6.0 meters. Since we do not have the total time, we cannot calculate the average speed directly. Additionally, it's said that the ball's speed changes from 15 m/s to 10 m/s, which means that it is decelerating. However, with the information provided, we cannot accurately determine the ball's average speed without additional details such as the rate of deceleration or the time taken.
Assuming a typo in the question and that it's asking for the average of the initial and final speeds instead, we could simply calculate it by:
Average Speed = (Initial Speed + Final Speed) ÷ 2
In this case:
Average Speed = (15 m/s + 10 m/s) ÷ 2 = 12.5 m/s
However, this calculation assumes a linear change of speed, which might not be the case in a real-world scenario.
The value of the electrical charge on particles is never a whole number true or false
43.278 kg - 28.1 g use significant figures rule
85) List and discuss the structures of a long bone. 86) Discuss the organization of the five regions of the spine. 87) Explain how atlas and axis are different from other vertebrae. Discuss the roles they play in the body. 88) Differentiate among the three types of joints based on structural and functional classification. Provide examples of each type of joint.
Four 8.5 kg spheres are located at the corners of a square of side 0.52 m. calculate the magnitude and direction of the gravitational force exerted on one sphere by the other three. magnitude
The magnitude of the gravitational force exerted on one sphere by the other three can be calculated using Newton's Law of Universal Gravitation. Using the given information, the magnitude of the gravitational force is approximately 2.97 x 10^-8 N.
Explanation:The magnitude of the gravitational force between two objects can be calculated using Newton's Law of Universal Gravitation:
Fg = (G * m1 * m2) / r2
Where Fg is the gravitational force, G is the gravitational constant (approximately 6.67 x 10-11 Nm2/kg2), m1 and m2 are the masses of the objects, and r is the distance between the centers of the objects.
In this case, the mass of each sphere is 8.5 kg and the distance between their centers is 0.52 m.
Calculating the gravitational force between one of the spheres and the three others, we use the formula and plug in the values:
Fg = (6.67 x 10-11 * 8.5 kg * 8.5 kg) / (0.52 m)2
Calculating the result, the magnitude of the gravitational force exerted on one sphere by the other three is approximately 2.97 x 10-8 N.
What volume of .2500 m cobalt iii chloride is required to react completely with 25 ml of .0315 m calcium hydroxide?
did a reaction happen in the erlenmeyer flask? how can you tell?
To determine if a reaction happened in an Erlenmeyer flask, you can observe indicators such as color change, formation of a precipitate, and gas evolution.
Explanation:In order to determine if a reaction happened in the Erlenmeyer flask, you can observe several indicators:
Change in color: If the original reactants and the product have different colors, it suggests that a reaction took place.Formation of a precipitate: If a solid substance appears in the solution, it indicates the formation of a new compound.Gas evolution: If bubbles or a gas is produced, it signifies that a reaction occurred.Additionally, other observations such as the release of energy (exothermic reaction) or absorption of energy (endothermic reaction) can provide further evidence of a reaction.
What potential difference is needed to accelerate a he+ ion (charge +e, mass 4u) from rest to a speed of 1.8×106 m/s ?
Final answer:
The potential difference needed to accelerate a He+ ion to a specific speed can be calculated using kinetic energy and charge, with the equation V = ½mv² / q, where m is the mass of the ion, v is the velocity, and q is the charge.
Explanation:
The student has asked what potential difference is needed to accelerate a He+ ion (charge +e, mass 4u) from rest to a speed of 1.8×106 m/s. The kinetic energy gained by the ion when it's accelerated through a potential difference (V) is equal to the charge of the ion (q) times the potential difference (V). Thus, we use the equation KE = qV and also know that KE can be expressed as ½mv2. Therefore, we can set these equations equal to solve for V:
V = ½mv2 / q
Where m is the mass of the He+ ion, v is the final velocity, and q is the charge of the ion. For He+ ion, q is +e, which is 1.602×10−19 C because it has one fewer electron than a normal helium atom. The mass of a He+ ion can be converted to kilograms by multiplying the atomic mass unit (u) with the conversion factor (1 u = 1.6605×10−27 kg), so for 4u, it would be 4×1.6605×10−27 kg.
Plugging these values into the equation, we can calculate the required potential difference to achieve the given speed.
Two cars start from rest at a red stop light. When the light turns green, both cars accelerate forward. The blue car accelerates uniformly at a rate of 3.8 m/s2 for 4.6 seconds. It then continues at a constant speed for 9.2 seconds, before applying the brakes such that the car’s speed decreases uniformly coming to rest 257.71 meters from where it started. The yellow car accelerates uniformly for the entire distance, finally catching the blue car just as the blue car comes to a stop.
How fast is the blue car going 2.8 seconds after it starts?
The blue car accelerates at 3.8 m/s² from rest. After 2.8 seconds, its speed is calculated using the formula v = u + at. The car's speed at that moment is 10.64 m/s.
Explanation:To determine how fast the blue car is going 2.8 seconds after it starts, we use the formula for final velocity in uniformly accelerated motion, which is v = u + at, where v is the final velocity, u is the initial velocity, a is the acceleration, and t is the time.
Here, the initial velocity u is 0 m/s since the car starts from rest, the acceleration a is given as 3.8 m/s2, and the time t is 2.8 seconds.
Plugging the values into the formula gives us:
v = 0 m/s + (3.8 m/s2)(2.8 s) = 10.64 m/s.
Thus, the blue car is traveling at a speed of 10.64 meters per second after 2.8 seconds from the start.
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Each of the three plates has a mass of 10 kg. if the coefficients of static and kinetic friction at each surface of contact are μs = 0.3 and μk = 0.2 , respectively, determine the acceleration of each plate when the three horizontal forces are applied.
Final answer:
To calculate the acceleration of each plate, first find the force of kinetic friction using the mass of the plates and coefficients of friction. The acceleration can then be found by applying Newton's second law, considering the net force on each plate after friction is taken into account.
Explanation:
To determine the acceleration of each plate when three horizontal forces are applied, we first need to understand the role of static and kinetic friction. Given each plate has a mass of 10 kg, we can calculate the normal force (N) exerted by each plate, which is necessary for finding frictional forces. The normal force is equal to the weight of the plate, calculated as N = mg, where m is the mass and g is the acceleration due to gravity (9.8 m/s2). Thus, for a 10 kg plate, N = 10 kg × 9.8 m/s2 = 98 N.
The maximum static friction force that must be overcome to start moving the plate is calculated using Fₛ(max) = μsN, where μs is the coefficient of static friction (0.3). Therefore, Fₛ(max) = 0.3 × 98 N = 29.4 N. Once motion begins, the kinetic friction force applies, calculated using Fₘ = μkN, where μk is the coefficient of kinetic friction (0.2). Therefore, Fₘ = 0.2 × 98 N = 19.6 N. To find the acceleration of each plate, we apply Newton's second law of motion (F = ma), subtracting the kinetic friction force from the applied force, and solving for a.
Without specific values for the applied forces in the question, we've laid out the framework to calculate the acceleration. It's important to subtract the kinetic friction force from the applied force to find the net force before applying Newton's second law.
What's the steady state theory
Answer:
A theory explaining the model of the Universe.
Explanation:
Steady State theory, proposed in 1948 by Sir Hermann Bondi, Thomas Gold, and Sir Fred Hoyle, suggests that the universe is always expanding while maintaining a constant average density. This is achieved as matter is continuously created to form new stars and galaxies at the same rate as that of old ones becoming non-observable. This occurs as a consequence of increasing distance and velocity of recession of old stars and galaxies.
As per this theory, Universe has no beginning and no end in time. If looked at it from a grand scale, the arrangement of galaxies and average density remain same.
Later observation of the Universe gave results contradictory to Steady State Theory. This has led to increase in support of Big Bang Model of the Universe.
The steady state theory in systems theory means state variables do not change over time, and in chemical kinetics, it refers to the steady-state approximation where an intermediate's concentration is assumed constant, aiding in the analysis of complex reactions.
The steady state theory refers to a concept in systems theory where a system or process is said to be in a steady state if its state variables, which define the behavior of the system, are not changing over time. In the context of chemical kinetics, this often pertains to the steady-state approximation, where the concentration of an intermediate in a reaction is assumed to be constant over time because its formation rate is equal to its consumption rate. This approximation simplifies the mathematical analysis of complex reactions and is particularly useful in enzyme kinetics, as proposed by Briggs & Haldane in 1925.
The steady-state assumption does not imply that the system is static or that there is an absence of reaction fluxes. Rather, it means that even though reactions are occurring and products are being formed, the internal metabolite concentrations and the fluxes (input and output fluxes) are maintained constant over time. This is a critical simplification that aids in metabolic modeling and the analysis of enzymatic reactions.
Matter's resistance to a change in motion is called _____ and is directly proportional to the mass of an object. For an object to change its state of motion, a force must be applied to it?
When the space shuttle coasts in a circular orbit at constant speed about the earth, is it accelerating? if so, in what direction?
Yes, there is centripetal acceleration, whose direction is radially inwards, towards the center of the Earth.
How to get the acceleration?Remember that if an object is not accelerating, then it will remain at rest or will move with a constant velocity. Remember that velocity is defined by a magnitude (the speed) and a direction.
Now, in the case of a circular orbit, the speed is constant, but the direction of motion is not, so the velocity is not constant. So yes, we have acceleration.
That acceleration is called centripetal acceleration, and always appears when we have circular motion, is an acceleration that points inwards, to the center of the circle.
So in the case of the space shuttle that orbits Earth, the acceleration's direction would be radially inwards, towards the center of the Earth.
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state and explain guass law?
Final answer:
Gauss's Law is a fundamental principle in Physics that relates the electric flux through a closed surface to the net electric charge enclosed by the surface. It states that the electric flux is proportional to the total charge enclosed by the surface divided by the permittivity of free space.
Explanation:
Gauss's Law is a fundamental principle in Physics that relates the electric flux through a closed surface to the net electric charge enclosed by the surface. It states that the electric flux is proportional to the total charge enclosed by the surface divided by the permittivity of free space. Mathematically, it can be written as:
Σi E⟀Ai = Γenclosed / ε0
Where Σi E⟀Ai is the sum of the dot products of the electric field and the area vectors of small surface elements, Γenclosed is the net electric charge enclosed by the surface, and ε0 is the permittivity of free space.