A body is projected with an initial velocity u at an angle to the horizontal. The time taken by it to reach its maximum height is given by the expression A 2usine theta /g B usine theta /g C D u² sin² theta /2g E usine theta /2g
Answers
Answer:
The correct expression for the time taken by a body projected at an angle to the horizontal to reach its maximum height is:
u * sinθ / g [B]
Explanation:θ
When a body is projected at an angle to the horizontal with an initial velocity u, the vertical component of its initial velocity is = u * sinθ. The only force acting in the vertical direction is gravity, which causes the body to decelerate until it reaches its maximum height. At the maximum height, the vertical component of the velocity becomes zero.
The time taken to reach the maximum height can be calculated using the formula:
Time = (Change in vertical velocity)/(Acceleration due to gravity)
Since the vertical velocity decreases uniformly due to gravity, the change in vertical velocity is equal to the initial vertical velocity = u * sinθ. The acceleration due to gravity is denoted by 'g'.
Therefore, the expression for the time taken to reach the maximum height is:
Time = u * sinθ/ g
Hence, option B [(u * sin(θ)) / g] is the correct expression.
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Related Questions
Rank the following by their power output, from highest to lowest.1. Boeing 777 jet engine at full throttle (75 Megawatts) 2. Central Pennsylvania gasoline station in problem 1 (38 Megawatts)3. Electrical power production of the country of Togo in West Africa (10 MW)4. Diesel railroad locomotive (3 MW)
Answers
The ranking of the following by their power output, from highest to lowest is as follows:
Boeing 777 jet engine at full throttle (75 MW).Central Pennsylvania gasoline station in problem 1 (38 MW).Electrical power production of the country of Togo in West Africa (10 MW).Diesel railroad locomotive (3 MW).What is Power?In physics, power may be defined as the amount of energy that is considerably transferred or converted per unit of time. In the International System of Units, the unit of power is the watt.
Early locomotives and railcars with internal combustion engines ran on kerosene and gasoline. While internal combustion engines can operate well across a limited range of power, low-power gasoline engines may be coupled to mechanical gears. Therefore, Boeing 777 jet engine operating at full power (75 Megawatts) represents the highest power output.
Therefore, the ranking of the following by their power output, from highest to lowest is well mentioned above.
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Put the waves in order from shortest to longest wavelength
Answers
Answer:
b, a, c
Explanation:
The middle one has the shortest wavelength, then it's the top one and the last one has the longest wavelength.
In a descriptive study, the researcher should delay data collection until
a.he has made clear judgments with respect to the questions of who, what, when, where, why, and how of descriptive research.
b.he has made a clear determination of how the data items are to be analyzed.
c. he has specified the statistical tabulations and significance tests that will be used to uncover the relationships which exist among the variables.
d. items a through c should all be determined before data collection begins.
e. data collection should not be delayed but should begin as soon as the hypothesis is stated so as to expedite the research.
Answers
In a descriptive research, the researcher should delay data collection until items a through c should all be determined before data collection begins, option D.
Descriptive research is used to describe a population's or phenomenon's characteristics. It doesn't address inquiries concerning how/when/why the attributes happened. Instead, it addresses the "what" question, which asks, "What are the characteristics of the population or situation being studied?". The characteristics that are used to describe the population or situation typically come from a categorical scheme, which is also referred to as descriptive categories. The elements, for instance, are categorized in the periodic table. Researchers use information about the idea of electrons, protons and neutrons to devise this absolute plan.
The periodic table, which we now take for granted, was created through descriptive research. Illustrative exploration for the most part goes before informative examination. For instance, over time, the description of the elements in the periodic table made it possible for scientists to explain chemical reactions and make accurate predictions regarding the combinations of elements.
As a result, descriptive research cannot explain why something happened. As a result, descriptive research cannot be used to establish a causal relationship in which one variable has an impact on another. At the end of the day, graphic exploration can be said to have a low necessity for inward legitimacy.
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explain why as in the case of a falling hammer we may ignore the effects of air resistance and treat it as if it were in free fall
Answers
Answer:
When air resistance acts, acceleration during a fall will be less than g because air resistance affects the motion of the falling objects by slowing it down. Air resistance depends on two important factors - the speed of the object and its surface area. Increasing the surface area of an object decreases its speed.
Explanation:
i don't know if this helps
in trial 1 of an experiment, a cart moves with speed v0 on a frictionless, horizontal track and collides elastically with another cart that is initially at rest. in trial 2, the setup is identical except that the carts stick together during the collision. how does the speed of the two-cart system’s center of mass change, if at all, during the collision in each trial?Trial 1 Trial 2(A) Does not change Does not change(B) Does not change Decreases (C) Decreases Does not change(D) Decreases Decreases
Answers
The answer that matches both trials is (A) Does not change - Does not change.
The speed of the two-cart system's center of mass during the collision in each trial can be analyzed using the principle of conservation of momentum. In both trials, the total momentum before and after the collision remains the same.
In Trial 1, the collision is elastic, meaning that both kinetic energy and momentum are conserved. The center of mass does not change during the collision since the total momentum remains constant. Therefore, for Trial 1, the correct answer is "Does not change."
In Trial 2, the carts stick together during the collision, and although kinetic energy is not conserved, the total momentum is still conserved. As a result, the center of mass of the two-cart system does not change during the collision.
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A satellite with a mass of 718 kg is placed at an altitude of 1342
km above the surface of Triton. What is the strength of the
gravitational force on the satellite?
Answers
646 N is the strength of the gravitational force on the satellite
F=GmM/r²
satellite mass= 718 kg
mass of triton=1.35x10*23 kg
r= 352500m
F=GmM/r²
F=6.67×10^-11×718 kg×1.35x10*23 kg ÷(352500m)²
F=646 N
The gravitational subject has course, much as other electromagnetic fields just like the electric powered and magnetic fields. it's far a vector subject as a end result. The gravitational discipline power, which has the unit Newtons consistent with kilogram, is used to degree the gravitational discipline. This area force has a endless range and is constantly attracting.
The electromagnetic area, or the electrical and magnetic fields for charged debris and magnets, is comparable to the gravitational discipline. due to the fact electromagnetic discipline forces are stronger than gravitational field forces, they take priority over them.
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class 2 cables shall have a minimum voltage rating of ? .
Answers
Class 2 cables shall have a minimum voltage rating of 300 volts.
What is the voltage ?
The voltage is a measure of the difference in electric potential between two points in a circuit. It is measured in volts and is one of the basic parameters of electrical engineering. Voltage can be generated in a variety of ways, including through #SPJ1generators, batteries, and power supplies. When two points with different potentials are connected, current can flow from the higher potential point to the lower potential point. Voltage is also used to measure the potential difference between two points in a circuit, as well as to calculate the power in the circuit. In addition, voltage is used to control the flow of current in a circuit, by either increasing or decreasing the potential difference between the two points.
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When light hits a rough surface and is reflected, it is called reflection.
Answers
Is this supposed to be a true or false question? If so, then it's true.
Answer:
diffuse
Explanation:
EDGE
some one help me pls :(
Answers
Answer: A change in regular lifestyle is required
Explanation: various things a person can do is
[1] yoga practices
[2] avoiding eating junk foods
[3] adding fresh and green veggies to your daily diet
How will this surfboard’s streamlined shape affect its speed?
Answers
The tail shape of a surfboard greatly affected the board's interaction with the wave's face and the flowing of water flowing.
How does a shape of a surfboard affected?The tail shape of a surfboard affects how the board depends on the wave's face, and the water flowing between it. More comprehensive, thicker tail shapes have more surface area and assist the board to float and create lift - allowing the surfboard to plane over the surface of the water more efficiently.
The shape of both the surfboard and its fin swap the way the water moves around it if you can grab a wave as well as the turning ability of the surfboard.
So we can conclude that Surfboard bottom outlines are also essential. Concave and V-shaped contours have similar performances, for all opposite designs.
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A 10:1 scale model was constructed to study the flow of a reservoir. The maximum discharge of the reservoir is
200m3/s, and the maximum discharge of the model is 0.1m3/s. If the time measured by the model is 1 hour, this
is equal to how many hours in a circle?
Answers
The required number of circles is 83.33.
Scale ratio, S = 10:1
Maximum discharge of reservoir, Q = 200 m³/s
Maximum discharge of model, q = 0.1 m³/s
Time measured by model, t = 1 hour
Time measured in a circle, T = ?
We can use the following equation to relate the discharges, lengths, areas, and times of the reservoir and the model:
Q₁/Q₂ = (L₁/L₂)² × (A₁/A₂) × (t₁/t₂)
where Q₁ and Q₂ are the discharges, L₁ and L₂ are the lengths, A₁ and A₂ are the areas, and t₁ and t₂ are the times.
In the given problem:
L₁/L₂ = 10/1 (scale ratio)
A₁/A₂ = 1 (as the shapes are similar)
Q₁ = 200 m³/s
Q₂ = 0.1 m³/s
t₁ = 1 hour
Therefore,
200/0.1 = (10/1)² × 1 × (1/t₂)
Simplifying the equation, we get:
2000 = 100 × (1/t₂)
Solving for t₂, we find:
t₂ = 1/2000 hour
Now, we need to find out how many hours are in a circle. In a circle, the time period is 24 hours, i.e., T = 24 hours.
So, the number of circles in 1 hour is 1/24. Therefore, the number of circles in 1/2000 hour is:
(1/24) × (1/(1/2000)) = (1/24) × (2000) = 83.33
Thus, 1 hour is approximately equal to 83.33 circles.
Hence, the required number of circles is approximately 83.33.
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what are projectiles
Answers
Answer:
projectiles is an object
Explanation:
projectiles moves freely under the influence of gravity and air resistance
for which colour of light is. the index of refraction of glass largest
Answers
Answer:
don't know sorry for the irreverent answer..
Answer:
The index of refraction varies with frequency, it doesn't change as light travels from one medium to another, As violet colour has the shortest wavelength and so the refractive index is maximum for it.
Health education provides
A.medical health coverage
B.accurate health information
C.a wellness guarantee
D.none of the above
Answers
bulbs A, B, and C in figure Q32.11 are identical, and all are glowing.
a) Rank in order, from most to least, the brightness of the three bulbs. Explain
b) Suppose a wire is connected between points 1 and 2. What happens to each bulb? does it get brighter, stay the same, get dimmer, or go out? Explain.
Answers
a) The resistors in series have the same current.
b. The current through the resistor determines how much power passes through it
Ranking in order the brightnesses of the bulbs?a) A succession of resistors will share the same electricity. Therefore, the current going through light A is the same as the sum of the currents going through bulbs B and C. The brightness of light A is greater than that of bulbs C and B because the current is higher.
(b) When a wire is connected between 1 and 2, then the bulbs B and C are short circuited and no current pass through them. Then more current passes through the bulb A.
Bulb A: glows brighter ( due to more current )
Bulb B: go out ( due to no current )
Bulb C: go out ( due to no current )
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What is the wavelength of a wave with f = 0.9 Hz and v = 154.9 cm/s? To check, set Frequency to 0.90 Hz, Tension to 2.4 N, and Density to 1.5 kg/m.
Answers
Explanation:
wavelength = v / f
f=0.9
v=154.9
units should be cm
what is the charge of a newly formed oxygen ion
Answers
The charge of a newly formed oxygen ion would be -2
Hope this helps :)
a 40.0-kilogram child exerts a 100.-newton force on a 50.0-kilogram object. the magnitude of the force that the object exerts on the child is
Answers
The child is subjected to a force of 100 N from the object.
Given,
Mass of the child, m = 40 kgThe force exerted by the child, F = 100 NMass of the object, M = 50 kgThere is an equal and opposite reaction to every action, according to Newton's third law of motion.
The amount of force the item applied to the child was equal to the force the child applied to the object.These forces are acting in the opposite direction.Thus, the child is subjected to a force of 100 N as a result of the object.
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A 4.0 Ohms resistor, an 8.0 Ohms resistor, and a 12.0 Ohms resistor are connected in series with a 24.0 V battery. Calculate the current in the circuit.
Answers
Answer:
RESISTANCE=(4+8+12)Ohms
=24 ohms
V=IR
24= I ×24
I= 24/24
I= 1 A
CURRENT IS 1 A
Answer:
resistanceeeeeeeeeeeeeeeeeee
An eagle is flying at a speed of 3 m/s at an angle of 22.2 degrees below the horizontal with a fish in its talons. The fish wriggles loose,
and falls into the water a distance of 5 meters away from the point directly below where it made its escape.
How far above the water was the fish when it escaped?
At what speed does it hit the water?
Answers
The fish was approximately 1.23 meters above the water when it escaped. The fish hits the water with a vertical speed of approximately 10.64 m/s.
To determine the height at which the fish escaped and the speed at which it hit the water, we can analyze the horizontal and vertical motion separately.
Given:
Eagle's flying speed (Veagle) = 3 m/s
Angle below the horizontal (θ) = 22.2 degrees
Horizontal distance traveled by fish (Dhorizontal) = 5 meters
Let's first calculate the height at which the fish escaped:
The vertical motion of the fish can be modeled as a projectile motion. We can use the following equation to determine the vertical displacement (Δy) of the fish:
Δy = Vinitial * sin(θ) * t + (1/2) * g * \(t^{2}\)
Where:
Vinitial = Initial vertical velocity of the fish
θ = Angle below the horizontal
t = Time of flight
g = Acceleration due to gravity (approximately 9.8 m/s^2)
Since the fish was released by the eagle, its initial vertical velocity is 0 m/s. We can set up the equation as follows:
Δy = (1/2) * g * \(t^{2}\)
To calculate the time of flight (t), we can use the horizontal distance traveled by the fish and the horizontal component of the eagle's velocity:
t = Dhorizontal / (Veagle * cos(θ))
Substituting this value into the equation for Δy:
Δy = (1/2) * g * (Dhorizontal / \([Veagle * cos(theta)]^{2}\)
Substituting the given values:
Δy = (1/2) * (9.8 m/\(s^{2}\)) * (5 m / \((3 m/s * cos(22.2 degrees))^{2}\)
Calculating this value, we find:
Δy ≈ 1.23 meters
Therefore, the fish was approximately 1.23 meters above the water when it escaped.
Now, let's calculate the speed at which the fish hits the water:
The vertical component of the fish's velocity just before hitting the water can be found using the following equation:
Vvertical = Vinitial * sin(θ) + g * t
Since the fish was released by the eagle, its initial vertical velocity is 0 m/s. Substituting the values we calculated earlier:
Vvertical = 0 * sin(22.2 degrees) + (9.8 m/\(s^{2}\)) * (5 m / (3 m/s * cos(22.2 degrees)))
Calculating this value, we find:
Vvertical ≈ 10.64 m/s
Therefore, the fish hits the water with a vertical speed of approximately 10.64 m/s.
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distance travelled by a train is 495 km in 4 hours 30 minutes, what is its speed in m/s?
Answers
Answer:
9.09m/s
Explanation:
Speed = Distance/Time
Distance = 495km
Time = 4 hr 30 min = 4 hr 1/2hr = 4.5 hr
Therefore, Speed = 495/4.5 = 110km/h
Now to convert km/h to m/s
110 x 1000/ 110 x 110
110 cancels out each other, we are now left with
1000/110 = 9.09m/s
What is the displacement of the iguana between 0s and 5s?
Answers
Answer: the displacement is 8m and the distance traveled is also 8 meters
Explanation:
It travels from -2 to 6, a difference of positive 8, and since that was its initial starting point, displacement is 8m, distance traveled also happens to be 8m
Answer:
8 and 8 (No decimals needed) See attached! :)
Explanation:
Graph the percentages you obtained in question 1. Use the circle tool to place your points.
Answers
Answer:
Image below
Explanation:
Read the scenario and social media post.
Damien is researching organic gardening, which avoids pesticides—chemicals used to kill harmful insects. While looking for sources, he runs across this social media post.
Answers
Answer:
No answer
Explanation:
Because there is no question
Answer:
C. Biased in favor of pesticides.
Explanation:
Everyone experiences a wide range of emotions, but when could they indicate a mental disorder?
Answers
Answer:
Excessive paranoia, worry, or anxiety.
Long-lasting sadness or irritability.
Extreme changes in moods.
Social withdrawal.
Dramatic changes in eating or sleeping patter
Explanation:
hope it helps brainliest if right thx :)
the rotational speed of a flywheel increases by 40%. by what percent does its rotational kinetic energy increase? explain your answer.
Answers
The rotational kinetic energy of a flywheel increases by 80% when its rotational speed increases by 40%. This is because the rotational kinetic energy of a flywheel is directly proportional to the square of its angular velocity.
The rotational speed of a flywheel increases by 40%. The percentage increase in its rotational kinetic energy is approximately 96.8%. Suppose the initial rotational speed of the flywheel is n1 and the initial rotational kinetic energy is K.E.1. After the speed of the flywheel is increased by 40 percent, the new speed is n2 = n1 + 0.4n1 = 1.4n1.
Then the new kinetic energy K.E.2 of the flywheel is given by K.E.2 = (1/2)I(n2^2)where I is the moment of inertia of the flywheel.Since n2 = 1.4n1, we have \(K.E.2 = (1/2)I(1.96n1^2) = 0.98I(n1^2).\).
Therefore, the percentage increase in the rotational kinetic energy of the flywheel is approximately 96.8%.
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A block weighing 35 N is resting on a steel table (us = 0.40).
The minimum force to start this block moving is
N.
Answers
Answer: 14
Explanation: 35•0.40
The minimum force to start this block moving is 14N,formula to be used to find minimum force(F= μ N
What does physics mean by minimum force?those minimal steps, including the use of force, required to defuse a crisis or protect oneself from an aggressive act or hostile intent. Once the target obeys orders or stops taking hostile action, all actions must stop.
How do you determine the greatest and smallest force?To solve such problems, you must find the second derivative: The force is at its minimum if the second derivative is positive; at its maximum if the second derivative is negative.
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True/False : oxygen is the only electron acceptor for cellular respiration on our planet today.
Answers
The given statement "oxygen is the only electron acceptor for cellular respiration on our planet today" is False because oxygen is the most common electron acceptor for cellular respiration in aerobic organisms, there are other electron acceptors that can be used in anaerobic respiration.
Examples include nitrate, sulfate, and carbon dioxide. These electron acceptors are used by microorganisms in environments where oxygen is not readily available, such as in deep-sea sediments, wetlands, and the digestive tracts of animals. Additionally, some organisms can carry out fermentation, which does not require an electron acceptor.
In summary, while oxygen is the primary electron acceptor for cellular respiration in aerobic organisms, there are other electron acceptors that can be used in anaerobic environments, and some organisms can carry out fermentation without an electron acceptor.
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A box of tools rests in the back of a pickup truck. The truck accelerates to the north and the box remains at rest in the truck. The direction of the friction force on the box of tools is _____.
Answers
Answer:
The direction of friction force is toards north.
Explanation:
A tool box is at rest on the back of a track. The truck is accelerating towards north.
As the frame of reference is acceleratinf so it is a non inertial frame of reference.
Thus, teh toolkit experineces a pseudo force towards the south direction.
According to the question, the toolbox is at rest so the fiction force is balances by teh psheudoforce, and thus teh friction force is acting toards north.
Which of these are some of the largest grazers in the tundra? (Select all that apply.)
1 wolves
2 ptarmigan
3 musk ox
4 caribou
Answers
Answer:
musk ox
caribou
Explanation: