Study the distance-time graph, showing the distances that eight different things cover in 120 seconds or less. The letters below correspond to the lines on the graph. For each object, calculate the average speed, and then match it with the closest correct answer.
A:
B:
C:
D:
E:
F:
G:
H:
Answers
Answer:
This question appear incomplete
Explanation:
This question appear incomplete because there is no list of closest correct answer there. Although can still be well attempted.
The formula to be used here is
average speed = distance ÷ time
The unit of speed here would be meters per second (m/s). However, some of the lines do not really fall on a measurable line on the graph and can only be "best assumed".
A: distance is 1600 meters
time appear to be 4 seconds (definitely less than 5 seconds according to the graph).
speed = 1600 ÷ 4
speed = 400 m/s
B: distance is 1600 meters
time appear to be 18 seconds (definitely less than 20 seconds according to the graph)
speed = 1600 ÷ 18
speed = 88.89 m/s
C: distance is 1600 meters
time is 65 seconds
speed = 1600 ÷ 65
speed = 24.62 m/s
D: distance is 1600 meters
time is 105 seconds
speed = 1600 ÷ 105
speed = 15.24 m/s
E: distance is 1100 meters
time is 120 seconds
speed = 1100 ÷ 120
speed = 9.17 m/s
F: distance is 500 meters
time is 120 seconds
speed = 500 ÷ 120
speed = 4.17 m/s
G: distance appear to be 250 meters
time is 120 seconds
speed = 250 ÷ 120
speed = 2.08 m/s
H: distance appear to be 50 meters
time is 120 seconds
speed = 50 ÷ 120
speed = 0.42 m/s
The average speed for each object are:
1. The average speed of A is 400 m/s
2. The average speed of B is 88.89 m/s
3. The average speed of C is 24.62 m/s
4. The average speed of D is 15.24 m/s
5. The average speed of E is 9.17 m/s
6. The average speed of F is 4.17 m/s
7. The average speed of G is 2.08 m/s
8. The average speed of H is 0.33 m/s
Average speed is defined as the total distance travelled divided by the total time taken to cover the distance.
Average speed = Total distance / total timeWith the above formula, we can obtain the average speed for each object as follow:
1. Determination of average speed of A
Total distance = 1600
Total time = 4 s
Average speed =?Average speed = 1600 / 4
Average speed of A = 400 m/s2. Determination of average speed of B
Total distance = 1600
Total time = 18 s
Average speed =?Average speed = 1600 / 18
Average speed of B = 88.89 m/s3. Determination of average speed of C
Total distance = 1600
Total time = 65 s
Average speed =?Average speed = 1600 / 65
Average speed of C = 24.62 m/s4. Determination of average speed of D
Total distance = 1600
Total time = 105 s
Average speed =?Average speed = 1600 / 105
Average speed of D = 15.24 m/s5. Determination of average speed of E
Total distance = 1100
Total time = 120 s
Average speed =?Average speed = 1100 / 120
Average speed of E = 9.17 m/s6. Determination of average speed of F
Total distance = 500
Total time = 120 s
Average speed =?Average speed = 500 / 120
Average speed of F = 4.17 m/s7. Determination of average speed of G
Total distance = 250
Total time = 120 s
Average speed =?Average speed = 250 / 120
Average speed of G = 2.08 m/s8. Determination of average speed of H
Total distance = 40
Total time = 120 s
Average speed =?Average speed = 40 / 120
Average speed of H = 0.33 m/sLearn more: https://brainly.com/question/14988345
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Explanation:
The lines on the position-time graph shows the velocities of different vehicles. Which line represents a vehicle moving at a constant velocity?
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A car tyre is pumped to a pressure of 20000 Nm-2 in the morning when the temperature is 23 oC. Later in the day, the temperature rises to 34 oC. Calculate the new pressure in the tyre. The volume is kept constant.
Answers
Answer:
20743.24 Nm¯²
Explanation:
From the question given above, the following data were obtained:
Initial pressure (P1) = 20000 Nm¯²
Initial temperature (T1) = 23 °C
Final temperature (T2) = 34 °C
Final pressure (P2) =?
Volume = constant
Next, we shall convert celsius temperature to Kelvin temperature. This can be obtained as follow:
T(K) = T(°C) + 273
Initial temperature (T1) = 23 °C
Initial temperature (T1) = 23 °C + 273 = 296 K
Final temperature (T2) = 34 °C
Final temperature (T2) = 34 °C + 273 = 307 K
Finally, we shall determine the final (i.e the new) pressure of the tyre.
Initial pressure (P1) = 20000 Nm¯²
Initial temperature (T1) = 296 K
Final temperature (T2) = 307 K
Final pressure (P2) =?
Volume = constant
Since the volume is constant, the final (i.e the new) pressure of the tyre can be obtained by using the following formula:
P1/T1 = P2/T2
20000 / 296 = P2 /307
Cross multiply
296 × P2 = 20000 × 307
Divide both side by 296
P2 = (20000 × 307) /296
P2 = 20743.24 Nm¯²
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What would the speed of a free-falling cell phone be exactly 0.59 seconds after it is dropped
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Answers
Answer:
C. 5.8 m/s
Explanation:
You just need to multiply the rate of gravity, 9.8 m/s/s, by 0.59, time. You would get 5.782 so you would round it up to 5.8
Which of the following is a warning sign of an abusive relationship?
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Answer: The choices?
Explanation:
Explanation: Where are the rest of the questions ?
Question 6 of 10
What is the role of the commutator in a DC generator?
O A. It causes the magnetic fields of the permanent magnets to
reverse.
B. It causes the electric current to constantly reverse its direction.
C. It keeps the electric current flowing in one direction.
D. It keeps the magnetic fields of the permanent magnet steady.
SUBMI
Answers
Answer:
C. It keeps the electric current flowing in one direction.
Explanation:
just got it correct on my quiz.
The commutator in a DC generator keeps the electric current flowing in one direction option (C) is correct.
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The commutator in a DC generator converts the alternate current into the direct current.
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Student one used bowling ball A in a bowling game against Student 2, who used bowling ball B. Use Newton’s Three Laws of Motion to explain the following:
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Answer:
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Explanation:
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Answer:
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Explanation:
(please awnser i need my grade up) We can calculate the about of potential energy in an object using the formula PE = mgh where m is the mass of the object, g is the acceleration due to gravity (which on Earth is a constant 9.8) and h is the height the object is from ground. If I have a 2kg bar of gold and raise that to a shelf mounted 3 meters from the ground what is that objects GPE? Remember to insert the numbers into the formula like this PE = (2) (9.8) (3) , you may use your calculator to complete this multiplication problem.
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Answer:
88.2 J
Explanation: Hope I helped <3
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Answers
Answer:
The forces of push and pull
Explanation:
In the egg drop experiment, the egg is balanced on top of a toilet paper tube and balanced on a pan. The pan itself is placed on top of a glass of water. When the experimenter uses his hands to push the pan, the force of gravity pulls the egg downwards making it move down, right into the glass of water.
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Answer:
Forces of push and pull
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B) Peer pressure is the pressure to go along with the behavior and beliefs of your friends.
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D) Peer pressure is the pressure to do something dangerous.
Answers
Answer:
B because I remember that's what peer pressure is
Answer:
C
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Answer:
C
Explanation:
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Remember: up is +, down is -
Answers
Answer:
t = 0.0689 s
Explanation:
Given that,
Mass of a basketball, m = 0.622 kg
Initial velocity, u = 4.23 m/s (downward or negative)
Final velocity, v = 3.85 m/s (up of positive)
Average force, F = 72.9 N
We need to find the time it was in contact with the floor. The force is given by :
[tex]F=ma\\\\F=m\dfrac{v-u}{t}\\\\t=\dfrac{m(v-u)}{F}\\\\t=\dfrac{0.622\times (3.85-(-4.23))}{72.9}\\\\t=0.0689\ s[/tex]
So, the time of contact is 0.0689 s.
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Answers
Answer:
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Explanation:
Fnet = Net force
FR = Force of friction
m = mass
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F - FR = ma
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Answer:
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Answer:
i think is a
Explanation:
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2. Write "PE" or KE" next to the types of energy
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sound
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Sound- KE
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give two differences between visible light and infrared light
Answers
Answer:
Explanation:
Visible light has a wavelength that ranges from 380 nm – 750 nm on the electromagnetic spectrum while infrared light is just beyond it, ranging from 700 nm – 1 mm, the start of the non-visible portion of the spectrum. As a result, infrared cannot be seen except with special equipment like a security camera
Visible light is the common lighting method and we see it all around us. It is used in homes, work areas, factory floors, parking lots, loading docks, etc. They are also used as warning systems and to provide lighting for CCTV cameras in public places. The presence of floodlights warns intruders that their actions are being monitored.
Infrared light, however, is used when the intention is to monitor intruders covertly. Without a bright light to warn them about the presence of security cameras, intruders no longer feel the need to avoid surveillance, leaving them exposed to the IR-illuminated cameras.
Answer:
1. For humans, we can only see visible light, but can't see infrared.
2. Infrared have longer wavelengths than visible light.
I'll give brainliest!
During the last 5 million years, how often have the poles reversed
themselves?
5
20
10
15
Answers
the answer to this problem is 15
Answer:itts 20 15 is incorrect ill show u proof
Explanation:
Mars orbits the Sun once
every 687 days in a circle
of radius 2.28 x 10^10 m.
What is Mars' velocity?
(Unit = m/s)
Answers
Answer:
2413
Explanation:
If your on Acellus 2413 is what you want to put in
A cyclist acceleration from 0m/s to 8m/s in 3second. what is his acceleration?
Answers
Answer:
2.66 m/s² .
Explanation:
Initial velocity , u = 0 m/s
Final Velocity , v = 8 m/s
Time Taken , t = 3 s
So , Acceleration = (v-u)/t = (8 m/s - 0 m/s) /3 sec . = 8/3 m/s² = 2.66 m/s²
Which force is always pulling but never pushes and is directly influenced by mass
Answers
Answer:
i believe it is gravity
Explanation:
the gravitational force is a force that attracts any two objects with mass. it pulls things together does not pushes them.
Matter can go through a phase change and still have the same mass.
Answers
Answer:
True
Explanation:
In a physical change such as melting, can change its form but the total mass will remain the same. For example, in a chemical reaction, the total mass of substances that react will equal the mass of the products. However, it is important to mention that some phase changes such as from solid to liquid, the mass of an ice will be turned to the liquid what and during this phase change period, the mass of the ice consequently decreases.
an object with a mass of 6 kg accelerates 4 m/s2 when an unknown force is applied to it. what is the amount of the force?
Answers
Explanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 6 × 4
We have the final answer as
24 NHope this helps you
Answer:
24 n is the answer
PLEASE HELP (multiple choice)