Answers
Answer:
90 seconds to complete one lap around the track
Explanation:
To find the period of a runner's laps, we need to first find the length of time it takes for the runner to complete one lap around the track. We can do this by dividing the total time it takes to complete 5 laps by the number of laps:
period = 450 seconds / 5 laps
period = 90 seconds/lap
This means that it takes the runner 90 seconds to complete one lap around the track. This is the period of the runner's laps.
Related Questions
Look at the picture below and identify the atmospheric pressure found within the valley:
please help it is due in 10 min
Answers
briefly define what are micro-organisms
Answers
To qualify for the finals in a racing event, a race car must achieve an average speed of 255 km/h on a track with a total length of 2,200 m. If a particular car covers the first half of the track at an average speed of 213 km/h, what minimum average speed must it have in the second half of the event in order to qualify
Answers
Please find attached photographs of your answer. Hope it helps. Please do comment
A 10-newton force is required to hold a stretched spring 0. 20 meter from its rest position. What is the potential energy stored in the stretched spring?.
Answers
The potential energy stored in stretched spring is 1 Joule with the given data.
The force required to hold a spring in stretched spring is 10 N
As we are to calculate potential energy,
Force = \(k * x\)= 10 N
Displacement is x = 0.20 m
Potential Energy can be mathematically defined as:
Ep =\((F * x)/2\)
If we place values given in question in the above equation:
Ep =\((10*0*20)/2\)
Ep = 2/2
Ep = 1 Joule
Therefore, potential energy stored in stretched spring turns out to be 1 Joule based on the data that we have.
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In any given week, how often do you think you are exposed to sounds loud enough to cause hearing damage? Are you using hearing protection? Do you think (or know) that you have already experienced hearing loss? Though information about hearing loss is fairly widely distributed, it's still a common problem. Why do you think people don't use hearing protection more often? What could be done to encourage people to protect their hearing?
Answers
In any given week, I think I am exposed to sounds loud enough to cause hearing damage about 2-3 times. I am not using hearing protection at those times. I do not think I have already experienced hearing loss, but I am not sure.
What is hearing loss?Hearing loss refers to a partial or total inability to hear sounds in one or both ears. It can vary in severity, from mild to profound, and can affect people of all ages.
I think there are a few reasons why people don't use hearing protection more often. One reason is that they may not be aware of the risks of noise-induced hearing loss. Another reason is that they may not think the risks are high enough to warrant using hearing protection. Finally, some people may find hearing protection uncomfortable or inconvenient to use.
Here are some things that could be done to encourage people to protect their hearing:
More education about the risks of noise-induced hearing loss. More affordable and comfortable hearing protection.Learn more about hearing loss on https://brainly.com/question/24900023
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In a baseball game, Joseph hits a ball to the outfield. When does the ball have the most potential energy?
A. when the ball is caught
B. when the bat hits the ball
C. when the ball reaches its greatest velocity
D. when the ball reaches its highest point
Answers
It has the greatest Potential energy when the ball reaches its highest point.The correct option is D
What is potential energy?Potential energy is the energy that an object possesses due to its position or state, which can be converted into work or kinetic energy when acted upon by a force.
There are three types of Potential Energy such as :
Elastic Potential Energy: Anything that can act like a spring or a rubber band can have elastic potential energyGravitational Potential Energy: There is a constant attractive force between the Earth and everything surrounding it, due to gravityChemical Potential Energy.Learn more about Potential Energy here: brainly.com/question/1242059
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Answer:
1) PE=mgh
2)when the ball reaches its highest point
3)21,599,200 J
4) The object’s mass, gravity, and height determine its potential energy.
5)Members of a team work together to create a plan, and then members choose different tasks to carry out the plan.
how does gravity change as it nears an object
Answers
the following equation shows the position of a particle in time t, x=at2i + btj where t is in second and x is in meter. A=2m/s2, b=1m/s. Find
A, the average velocity of the particle in the time interval t1=2sec and t2=3sec
B, the velocity and acceleration at any time t.
C, the average acceleration in the time interval given in part (a)
Answers
(a) The average velocity of the particle in the time interval t₁=2sec and t₂=3sec is 10 m/s.
(b) The velocity and acceleration at any time t is v = (2ati + bj) m/s and a = 2ai m/s²
(c) The average acceleration in the time interval given in part (a) is 4 m/s².
Position of the particlex = at²i + btj
x = 2t²i + tj
Average velocity, at t₁=2sec and t₂=3secΔv = Δx/Δt
x(2) = 2(2)²i + 2j
x(2) = 8i + 2j
|x(2)| = √(8² + 2²) = 8.246
x(3) = 2(3)²i + 3j
x(3) = 18i + 3j
|x(3)| = √(18² + 3²) = 18.248
Δv = (18.248 - 8.246)/(3 - 2)
Δv = 10 m/s
Velocity and acceleration at any time, tx = at²i + btj
v = dx/dt
v = (2ati + bj) m/s
a = dv/dt
a = 2ai m/s²
Average accelerationa = 2ai m/s²
a = 2(2)(1)
a = 4 m/s²
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Kara Less was applying her makeup when she drove into South's busy parking lot last Friday morning. Unaware that Lisa Ford was stopped in her lane 30 feet ahead, Kara rear-ended Lisa's rented Taurus. Kara's 1100-kg car was moving at 10.9 m/s and stopped in 0.159 seconds.
Answers
The change in momentum of Kara's car is -1.43 × 10⁴ kg.m/s, the magnitude of force is -1.021 × 10⁵ N.
What is Force?Force is the external agent which causes the motion of an object or it is the resistant which makes the object come at rest from motion. It is a vector quantity, because it has both the magnitude and direction.
Mass of Kara's car = 1300 Kg
moving with speed = 11 m/s
time taken to stop = 0.14 s
final velocity = 0 m/s
distance between Lisa ford and Kara's car = 30 m
a) change in momentum of Kara's car
Δ P = m Δ v
Δ P = m(vf - vi)
Δ P = 1300 (0 - 11)
Δ P = -1.43 × 10⁴ kg.m/s
The impulse is equal to the change in momentum of the car
I = -1.43 × 10⁴ kg.m/s
Magnitude of the force experienced by Kara
I = F × t
where, I is impulse acting on the car
t is time
- 1.43 × 10⁴ = F × 0.14
F = -1.021 × 10⁵ N
Negative sign represents the direction of the force.
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Your question is incomplete, most probably the complete question is:
Kara Less was applying her makeup when she drove into South's busy parking lot last Friday morning. Unaware that Lisa Ford was stopped in her lane 30 feet ahead, Kara rear-ended Lisa's rented Taurus. Kara's 1300-kg car was moving at 11 m/s and stopped in 0.14 seconds.
a. Determine the momentum change of Kara's car.
b. Determine the impulse experienced by Kara's car.
c. Determine the magnitude of the force experienced by Kara's car.
pls help!!
An object is placed 3.0 cm away from a convex lens of focal length 2.0 cm as shown in fig.
1. Use the lens equation to calculate the image distance.
2. Is the image real or virtual? how do you know ?
Answers
(1) The distance of the image formed by the lens is determined as 6 cm.
(2) The image formed is real.
What is the image distance?The distance of the image formed by the lens is calculated by applying the following formula as follows;
1/f = 1/v + 1/u
where;
v is the image distanceu is the object distancef is the focal length of the lensThe distance of the image formed by the lens is calculated as;
1/v = 1/f - 1/u
1/v = 1/2 - 1/3
1/v = 1/6
v = 6 cm
Since the sign of the image of the image is positive, the image formed is real.
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What is the relationship between temperature and humidity? Directly proportional or inversely proportional, if temperature increases/decreases, does humidity decrease/increase?
Answers
Simply put, the formula for the relationship between humidity and temperature is that they are inversely proportional.
The relative humidity will drop as the temperature rises, making the air drier; conversely, if the temperature drops, the air will get wet and the relative humidity will rise.
Is the relationship between temperature and humidity inverse?Temperature and humidity have an inversely proportionate relationship. The relative humidity will decrease as temperature rises, making the air drier. As a result of the air becoming wetter as the temperature drops, the relative humidity will rise.
Does temperature cause humidity to rise or fall?With the same quantity of absolute/specific humidity, air will have a HIGHER relative humidity if it is cooler and a LOWER relative humidity if it is warmer because warm air may contain more water vapor (moisture) than cold air.
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There is a distance of 3.60 * 10 ^ 7 m between the Earth and a satellite. The magnitude of the gravitational force of attraction between the and the Earth is 400 N. What would be the magnitude of the gravitational force of attraction if the distance between them changed to 1.80 * 10 ^ 7 meters?
Answers
Given:
The initial distance between the earth and the satellite, R₁=3.60×10⁷ m
The initial force between the earth and the satellite, F₁=400 N
The changed distance between the earth and the satellite R₂=1.80×10⁷ m
To find:
The changed force between the earth and the satellite.
Explanation:
From Newton's gravitational law, the gravitational force between two objects is directly proportional to the product of the mass of the objects and inversely proportional to the square of the distance between them.
Let us assume that the mass of the earth is M and the mass of the satellite is m.
Thus,
\(\begin{gathered} F_1=\frac{GMm}{R_1^2} \\ \Rightarrow F_1R_1^2=GMm\text{ }\rightarrow\text{ \lparen i\rparen} \end{gathered}\)And, the changed force is given by,
\(\begin{gathered} F_2=\frac{GMm}{R_2^2} \\ \Rightarrow F_2R_2^2=GMm\rightarrow\text{ \lparen ii\rparen} \end{gathered}\)From equation (i) and equation (ii),
\(\begin{gathered} F_1R_1^2=F_2R_2^2 \\ \Rightarrow F_2=\frac{F_1R_1^2}{R_2^2} \end{gathered}\)On substituting the known values,
\(\begin{gathered} F_2=\frac{400\times\left(3.60\times10^7\right?^2}{\lparen1.80\times10^7)^2} \\ =1600\text{ N} \end{gathered}\)Final answer:
The magnitude of the gravitational force of attraction between the earth and the satellite after the distance between them was changed is 1600 N.
Cobalt-60 has a half-life of 5 years. After 20 years, what percent of the original sample would remain?
Answers
Answer:
6.25%
Explanation:
20/5=4
half-life=1/2 of previous life
1/2=50%
50%=0.5
(0.5)^4 = ==> get the 4 from dividing total years(20) by the half-life(5): 20/5
0.0625
0.0625*100%=6.25%
A 2 kg mass of copper is heated for 40 seconds by a heater which produces 100J/s and the SHC of the copper is 400J what is the rise in temperature
Answers
Answer/Explanation:
m= 2kg
t= 40s
P= 100J/s
C= 400J/kg°C
Q= P×t
= 100×40= 4000J
Q= m×C×∆t
4000= 2×400×∆t
∆t= 4000/(2×400)
∆t= 5°C
P stands for power
Q is heat energy, and we know that power multiplied by time gives amount of energy (which in this case is heat energy)
Brainliest?!
Match the principle of logic or fallacy with the right definition.
Appropriate authority
Non contradiction
If two statements contradict, one must logically be false.
The person has credibility or credentials in the issue being
discussed.
Answers
Answer: Non contradiction: If two statements contradict, one must logically be false.
Appropriate authority: The person has credibility or credentials in the issue being discussed.
Explanation:
Insulator Problem. How does end A of the rod react when the ball approaches it after it has already made several contacts with the rod, such that a fairly large charge has been deposited at end A?strongly repelledstrongly attractedweakly attractedweakly repelledneither attracted nor repelled
Answers
As the charged ball reaches the rod's end A, it is strongly deflected away from it. Therefore, option (A) is the correct one.
What kinds of things are insulators used for?Materials that act as insulators stop electricity from flowing through them. Because materials resist electric current, insulators are used as a barrier against the potentially damaging effects of electricity. Insulators include materials like glass, air, timber, plastic, and rubber, to name a few.
What does the term "insulator" signify in science?a device that separates and supports conductors and is made of an electrical insulating material. a substance with weak heat or electrical conductivity. contrast with semiconductor
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The number of hours
of daylight tat a location receives varies depending on how far north or south it is from the
Answers
Answer:
equator
Explanation:
in south & north pole you could have 20+ hours daylight or night, everyday!
A lost chicken is trying to cross the street. Its velocity v as a function of time t is given in the graph
below where rightwards is the positive velocity direction.
v (m/s)
5
4+
3
21
1-1
2
3
4
5
-2
-3
-4
-5
What is the chicken's displacement Ax from t = 2 sto 4's?
Answers
Answer:-7.5
Explanation:
i just did it
A power plant burns coal to generate electricity. Suppose that 1000 J of heat (Q) from the coal fire enters a boiler, which is kept at a constant temperature of 900 C. That 1000 J is used to boil water in a boiler. The steam from the boiler is used to drive a turbine that creates electricity (work). The excess heat is put into a cooling tower at 5 C.
Carnot efficiency If everything is perfectly efficient,
• What is the maximum efficiency that the plant could operate at?
• How much work could be done starting from that 1000 J?
Answers
Answer:
The work done will be "763 J". A further explanation is given below.
Explanation:
The given values are:
\(Q_1=1000 \ J\)
Temperature,
\(T_1=900^{\circ} C\)
i.e,
\(=1173\)
\(T_2=5^{\circ}C\)
i.e.,
\(=278\)
As we know,
⇒ \(\eta =1-\frac{T_2}{T_1}\)
On substituting the values, we get
⇒ \(=1-\frac{278}{1173}\)
⇒ \(=\frac{1173-278}{1173}\)
⇒ \(=\frac{895}{1173}\)
⇒ \(=0.763\)
then,
⇒ \(W=\eta Q_1\)
⇒ \(=0.763\times 1000\)
⇒ \(=763 \ J\)
If and object undergoes a change in momentum of 12 kg*m/s over a 10
second interval, what was the force exerted?
Answers
The magnitude of the force exerted on this object is 1.2 Newton.
Given the following data:
Change in momentum = 12 Kgm/s.Time = 10 seconds.What is impulse?In Science, the impulse that is experienced by an object is always equal to the change in momentum of the object, due to the force acting on an object.
Mathematically, impulse is given by this formula:
\(Impulse = change\;in\;momentum\\\\Force \times time = m \Delta V\)
Substituting the given parameters into the formula, we have:
\(Force \times 10=12\\\\Force =\frac{12}{10}\)
Force = 1.2 Newton.
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a bird flies 3km to the west and then 4km to the south. find the resultant displacement of the bird
Answers
Answer:
We are asked to calculate for the resultant displacement.
We therefore conclude that the resultant displacement of the bird is 5 Km, 53o 5 K m , 53 o South of West.
Explanation:
have a nice day.
HELLPPPP PLZZZ
10. Identify Which gas law
does this graph represent.
Answers
The tune-up specifications of a car call for the spark plugs to be tightened to a torque of 50 N⋅m. You plan to tighten the plugs by pulling on the end of a 30-cm-long wrench. Because of the cramped space under the hood, you'll need to pull at an angle of 105 ∘ with respect to the wrench shaft.
With what force must you pull?
Answers
The force needed to pull the wrench of 30 cm long is 643.95 N.
What is force?Force can be defined as the product of mass and aceleration.
To calculate the force that must be pull, we use the formula below.
Formula:
F = T/Lcos∅.......... Equation 1Where:
F = ForceT = TorqueL = Length of the wrench∅ = AngleFrom the question,
Given:
T = 50 N.mL = 30 cm = 0.3 m∅ = 105°Substitute these values into equation 1
F = 50/(0.3×cos105°)F = -643.95 N.Note: The negative sign tells the direction of the force and can be ignored (Pull)
Hence, the force need to pull is 643.95 N.
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Which car has the greater acceleration magnitude: car A that accelerates from 0 to 10 m/s in 50 m or car B that accelerates from 10 m/s to 20 m/s in 50 m
Answers
The car that has the greater acceleration magnitude is car B
Torricelli's theorem can be used to calculate the magnitude of an object's acceleration when the value of time is not known:
\(v^{2} = v_{0}^{2} + 2a\Delta S\)
Note that \(v\\\) is the final velocity value, \(v_{0}\) is the initial velocity value, \(a\) is the acceleration value, and \(\Delta S\) is the displacement.
Substituting the values given by the question in the formula, we have:
CAR A\(10^{2}= 0^{2}+2\times a \times 50\)
\(100 = 100a\)
\(a = 1m/s^{2}\)
2. CAR B
\(20^{2} = 10^{2} + 2\times a \times 50\)
\(400 = 100 + 100a\)
\(100a=300\)
\(a = 3m/s^{2}\)
So, comparing the two acceleration calculated above, it is assumed that the car has the greater acceleration magnitude is car B with \(3m/s^{2}\) comparing to \(1m/s^{2}\) of the car A.
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WILL DO BRAINLIEST A jar contains seven pink, 6 orange, and four blue marbles. If you pick one without looking, what is the probability that the marble you pick will be orange?
6/10
6/17
11/17
7/11
Answers
Answer:
Choice 2: 6/17
Explanation:
4+7=11. 6+11= 17. so it's 6/17
A graph shows distance (km) v. time (h) for a car trip. If two points on the graph are (1, 40) and (3,130), which is the average speed during this interval of time?
Answers
We are given two points on the distance-time graph: (1, 40) and (3,130)
This means that:
At time 1 hour, the distance traveled was 40 km
At time 3 hours, the distance traveled was 130 km
We want to find the average speed during this 2 hour interval (from 1 hour to 3 hours).
Average speed is defined as:
Average Speed = Change in Distance / Change in Time
The change in distance is the distance traveled from 1 hour to 3 hours, which is 130 km - 40 km = 90 km
The change in time is 3 hours - 1 hour = 2 hours
So, the average speed is:Average Speed = 90 km / 2 hours
= 45 km/hr
Therefore, the average speed during this interval of time is 45 km/hr.
how do you mountaineers reduce the effects of changes in atmospheric pressure?
Answers
Sully is riding a snowmobile on a flat, snow-covered surface with a constant velocity of 10 meters/second. The total mass of the snowmobile, including Sully, is 280 kilograms. If Sully accelerates to a velocity of 16 meters/second over 10 seconds, what’s the force exerted by the snowmobile to accelerate? Use F = ma, where . A. 160 N B. 168 N C. 248 N D. 280 N E. 324 N
Answers
Answer:
280.6N
Explanation:
According to Newton's second law;
Force = mass * acceleration
Given
Mass = 280kg
velocity = 10m/s
Time = 10 secs
Acceleration = velocity?/Time
Force = mass * velocity/time
Force = 280 + (16-10/10)
Force = 280 + 0.6
Force = 280.6N
Hence the force exerted by the snowmobile to accelerate is 280.6N
Answer:168 N
Explanation:
Which of these forms due to the force of compression?
A) Anticline
B) Normal Fault
C) Strike-Slip Fault
D) Fault-Block Mountain
Answers
Answer:
anticline
Explanation:
hope u will understand
Answer:
Got it right on edge 2020
Explanation:
anticline
Which best describes the direction of heat?