A bicyclist brakes from 21.7 m/s to a stop in 32.3 m.
What is the acceleration of the bicyclist?
How much time does it take for the bicyclist to stop?
What is the bicyclist’s average speed?
The acceleration of the bicycle during the motion before stopping is 7.29 m/s².
The time taken for the bicycle to stop is 2.98 s.
The average speed of the bicycle is 10.83 m/s.
The given parameters;
initial velocity of the bicycle, u = 21.7 m/sdistance traveled by the bicycle, s = 32.3 mThe acceleration of the bicycle is calculated ad follows;
v² = u² + 2as
where;
v is the final velocity of the bicycle after stopping = 0
0 = u² + 2as
-2as = u²
[tex]a = -\frac{u^2}{2s} \\\\a = \frac{(21.7)^2}{2\times 32.3} \\\\a = -7.29 \ m/^2\\\\|a| = 7.29 \ m/s^2[/tex]
The time taken for the bicycle to stop is calculated as;
v = u + at
0 = 21.7 - 7.29t
7.29t = 21.7
[tex]t = \frac{21.7}{7.29} \\\\t = 2.98 \ s[/tex]
The average speed of the bicycle is calculated as;
[tex]v = \frac{totla \ distance}{total \ time} \\\\v = \frac{32.3}{2.98} \\\\v = 10.83 \ m/s[/tex]
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As Al pine jumps off the end of a ski jump he has an initial velocity of 13m/s
A) how high will he be 2 sec after he jumps
B) at what other time will he be as high as he is in part(a)
C) at 2 sec was Al going up or down? Explain your reasoning
D) when is he again at the height of the skip jump?
E) Al spends a total of 5.2 seconds in the air. How far below the end of the skip jump is the ground
Answer:
(Hope this helps can I pls have brainlist (crown)☺️)
Explanation:
In pic
Hai quả cầu nhỏ hoàn toàn giống nhau, mang điện tích q1, q2 đặt trong chân không cách nhau 20cm thì hút nhau F = 5×10^-5. đặt vào giữa hai quả cầu tấm thủy tinh dày 5 cm có hằng số điện môi là 4. tính lực tác dụng giữa hai quả cầu
Answer:
Hai quả cầu nhỏ hoàn toàn giống nhau, mang điện tích q1, q2 đặt trong chân không cách nhau 20cm thì hút nhau F = 5×10^-5. đặt vào giữa hai quả cầu tấm thủy tinh dày 5 cm có hằng số điện môi là 4. tính lực tác dụng giữa hai quả cầu
I need the right answer ASAP NO LINKS!!!
The first one!
Hope this helps pls mark as brainliest :)
Answer:
Models change to accommodate new discoveries.
Explanation:
Scientific models are based on current scientific knowledge. This means that when new discoveries are made they are subject to change.
ph
what’s the correct choice?
help!!
Answer:
I think it's protons as they're positive!!
What is an uncharged body? In physics (simple words)
An uncharged body is a body that has equal magnitude of positive as well as negative charge on it. So as soon as some charged body is placed near it, the charged body induces negative charges on the uncharged body.
What important scientific advance made bacteria less dangerous to humans
Answer:
bacteria like
virus
1. A cross country skier averages 3.2 m/s over 9.1 km. How long did the skier's trip
take?
Answer:
your answer is 12.3
Explanation:
hope it helps : )
9.) Why would a pendulum swing faster or slower on different planets?
Please help with this :(
Answer:
Below
Explanation:
We can use this formula to find the acceleration of the crate :
acceleration = net force / mass of object
Plug in our values :
acceleration = 50 N / 50 kg
= 1 m/s^2
acceleration = 100 N / 50 kg
= 2 m/s^2
acceleration = 150 N / 50 kg
= 3 m/s^2
acceleration = 200 N / 50 kg
= 4 m/s^2
Hope this helps! Best of luck <3
If you spill household bleach on denim jeans, you will observe that the area of the spill no
longer has a blue color. Is this change chemical or physical? Give a reason for your
answer.
Answer: chemical change.
Explanation: Because the bleach has caused the denim to change color, the change is likely to be a chemical change.
The change that occurs when household bleach is spilled on denim jeans is a chemical change.
A physical change is a change in the form of a substance, but not in its chemical composition. For example, if you melt a piece of ice, you have made a physical change because the ice has changed from a solid to a liquid, but the chemical composition of the ice has not changed.
A chemical change is a change in the chemical composition of a substance. This means that the atoms in the substance are rearranged to form new substances. For example, when household bleach is spilled on denim jeans, the bleach reacts with the indigo dye in the jeans to form a new substance that is colorless.
In the case of household bleach on denim jeans, the bleach reacts with the indigo dye in the jeans to form a new substance that is colorless. This is a chemical change because the chemical composition of the indigo dye has been changed. The color change is a clear indication that a chemical change has occurred. When the bleach reacts with the indigo dye, the bonds between the atoms in the indigo dye are broken and new bonds are formed. This results in the formation of a new substance that is colorless.
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What would the position-time graph look like for an object that remains still over time?(1 point)
A. a horizontal line
B. an upward curve
C.an increasing line
D. a decreasing line
Plz Helppp. I need it ASAP
Answer:
a
Explanation:
it would be horizontal
The position-time graph look like A. a horizontal line for an object that remains still over time.
A position-time graph shows how far an object has moved from its starting point at any given time since it started moving. The slope of a position graph shows the velocity of an object.
The position-time graph looks like a horizontal line for an object that remains still over time.
Option A. is correct.
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Why is carbon-14 the best element to use for dating things?
Answer:
the radioactivity of carbon-14 DECAYS BY HALF.
Explanation:
Cuales son las propiedades de los materiales semiconductores de electricidad?
Answer:En general, los semiconductores son materiales, inorgánicos u orgánicos, que tienen la capacidad de controlar su conducción dependiendo de ...
Explanation:
explain what is the function of energy in the body and discuss internal and external body funcutions which energy is needed for
Answer:
Energy fuels your body's internal functions, repairs, builds and maintains cells and body tissues, and supports the external activities that enable you to interact with the physical world. Water, your body's most important nutrient, helps facilitate the chemical reactions that produce energy from food.
Speed is __________ velocity.
a) The same as
b) The absolute value of
c) The negative of
d) The rate of change of
Answer:
Speed is the rate of change of velocity.
Explanation:
Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object's movement. Put another way, speed is a scalar value, while velocity is a vector. Speed is just describing how fast the motion is compared to velocity.
Hope this helps :)
Position vs. Time
30
20
10
Position (m)
10
- 20
- 30
o
10 20
30
40 50
Time (s)
60
70
6. Use the graph above to answer Question 6:
The graph represents the motion of a car moving linearly. When is the car
moving backwards?
A. Os to 10 s
B. 20 s to 40 s
C. 40 s to 50 s
D. 50 s to 60 s
Answer:
D
Explanation:
cause the slope works with going up or down
What is a common disease caused by a fungus?
A.
common cold
B.
HIV/AIDs
C.
athlete's foot
D.
pneumonia
Why would protons and neutrons hold together in the first second following the Big Bang?
Answer:
The universe was hot and dense
Why do atoms
have no electric charge even though most of
rticles have charges?
Paolo says that his bicycle is hard to pedal.Mia looks at the bicycle and tells him he needs to oil the chain.explain why oiling the chain would help paolo
Answer:
Less friction
Explanation:
Paolo's bike is too difficult to pedal because there is too much friction in the mechanisms of the bike. To reduce friction, Paolo must oil the chain. This will make the bike run much more smoothly and allow for easier pedalling.
Which is greater 15 or 0.15
Answer:
15
Explanation:
0.15 is a decimal place after a 0, whereas the 15 is a whole number
What is the acceleration of a car that travels a constant velocity of 5.0 m/s for 5.5s?
Answer:
The acceleration of car is 0m/s .
Explanation:
The velocity doesn't change .
"constant velocity" means zero acceleration.
Which electromagnetic waves which electromagnetic waves have the highest frequencies in the electromagnetic spectrum?
OA.
gamma rays
B.
microwaves
O C.
radio waves
OD.
ultraviolet radiation
Answer:
gamma rays
Explanation:
What is the best app to practise physics?
Answer:
PhysicsProf.
Explanation:
Its the best
give brainliest or thanks tysm
Answer:
PhysicsProf
Explanation:
A circus performer juggling while standing on 10 a tightrope suspended 15.0 m above the ground tosses a sword directly upward into the air with a speed of 5.0 m/s. If the sword leaves his hand 1.0 m above the tightrope, what is the sword's maximum height above the ground? Round your answer to the nearest tenth
The sword's maximum height above the ground rounded to the nearest tenth is 122.49m
In order to get the maximum height of the rope above the ground, we will use the formula for calculating the range;
[tex]R=u\sqrt{\frac{2H}{g} }[/tex]
Given the following parameters:
speed u = 5.0m/s
H is the maximum height
g is the acceleration due to gravity = 9.8m/s
R is the range = 15.0m
Substitute the given parameters into the formula to have:
[tex]15=5\sqrt{\frac{2H}{9.8} }\\\frac{15}{3}=\sqrt{0.2041H} \\5^2 = 0.2041H\\H = \frac{25}{0.2041}\\H= 122.48m[/tex]
Hence the sword's maximum height above the ground rounded to the nearest tenth is 122.49m
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Answer:
the answer its time
v = d/t
Answer:distance
Explanation:
gravitational force acts a only between the sun and the planets moving around it b only between the Earth and the body is on it c between all bodies in the universe d only between the sun and the earth.
Answer:
(C) all bodies
F = G M1 M2 / R^2 all bodies (M1 and M2) are gravitationally connected