Answer:
t=240s
Explanation:
Distance=120m
Acceleration=-5m/s^2
v=0
Let u=x m/s
Using equation v^2-u^2=2as:-
0-x=2(-5)(120)
-x=-1200
x=1200m/s
Using now equation v=u+at:-
0=1200+-5t
5t=1200
t=240s
If a car stops at 120 meters. If it has an acceleration of –5 meters/second², then it would take 6.928 seconds to stop.
What is acceleration?The rate of change of the velocity with respect to time is known as the acceleration of the object.
As given in the problem a car stops at 120 meters. If it has an acceleration of –5 meters/second², then we have to find out how long it would take seconds to stop.
By using the second equation of motion,
s = ut + 1/2at²
The distance traveled by car before stopping = 120 meters
acceleration = –5 meters/second²
-120 = 0 + 0.5×( –5)t²
t² = 120/2.5
t² =48
t = 6.928 seconds
Thus, the time taken by the car before stopping would be 6.928 seconds.
To learn more about acceleration from here, refer to the link;
brainly.com/question/2303856
#SPJ2
true or false: the height from which cliff divers jump affects the velocity at which they will fall. velocity is speed in a certain direction.
Answer:
False
Explanation:
Because that is not true
What is the Creation Mandate?
Every factor that is used in search engine ranking can be controlled by the site
owner.
True or False ?
Answer:
the answer is false
Explanation:
i just took the test
False every factor that is used in search engine ranking cannot be controlled by the site owner.
The ranking of a particular website is controlled is not controlled by the website owner instead it depends upon various factors that indicate towards user's experience. Factors like accessibility for search engines, content quality, keyword use, user intent, links and click through rate are the chief contributing factors that are responsible for promoting high rank of the website in the search engine.Learn more about search engine:
https://brainly.com/question/21403015
3. Consider the motion of the object whose velocity-time graph is given
in the diagram. What is the net displacement of the object between times
t = 0 and t = 2?
Velocity-time graph
8
(m/s)
8
12 16
16 m
2 m
8 m
56 m
Answer:
16 m.
Explanation:
From the question given above, we obtained the following data:
Initial velocity (u) = 0 m/s
Final velocity (v) = 8 m/s
Initial time (t1) = 0 sec
Final time (t2) = 2 secs
Net Displacement (ΔD) =?
Velocity is defined as the rate of change of the displacement of an object with time. Mathematically, it is expressed as:
Change in velocity (Δv) = change in displacement (ΔD) / change in time (Δt)
Δv = ΔD / Δt
Next we shall determine the change in velocity and time. This is illustrated below below:
Initial velocity (u) = 0 m/s
Final velocity (v) = 8 m/s
Change in velocity (Δv) =?
Change in velocity (Δv) = v – u
Change in velocity (Δv) = 8 – 0
Change in velocity (Δv) = 8 m/s
Initial time (t1) = 0 sec
Final time (t2) = 2 secs
change in time (Δt) =?
change in time (Δt) = t2 – t1
change in time (Δt) = 2 – 0
change in time (Δt) = 2 secs.
Finally, we shall determine the net displacement of the object as follow:
Change in velocity (Δv) = 8 m/s
change in time (Δt) = 2 secs.
Net Displacement (ΔD) =?
Δv = ΔD / Δt
8 = ΔD/2
Cross multiply
ΔD = 8 × 2
ΔD = 16 m
Therefore, the net displacement of the object is 16 m.
Usually you walk straight home from school. But today you take
a detour to buy some candy on the way home. Which will
change, the distance of our walk home, the displacement of
your walk home, or both?
Answer: the distance of our walk home.
Explanation:
In Physics when we speak of distance we refer to the space traveled that is always measured on the trajectory, while displacement refers to the space from an initial position to a final position regardless of the path. When the path is a straight line, the space traveled is equal to the module of the displacement.
SpymoreThere are many units of pressure. The standard one is Pa. Express Pa using only the fundamental units of meters, kilograms and seconds. Explain.
Answer:
Pa = kg/m.s²
Explanation:
Pascal (Pa) is the S.I unit of pressure. The formula of pressure is given as follows:
Pressure = Force/Area
The S.I Unit for force is Newton (N) and for Area is (m²). Therefore, the S.I Unit of Pressure will be:
Pressure = N/m²
Therefore, it will be equal to Pascal (Pa)
Pa = N/m²
but, the formula for force is given by Newton's 2nd Law:
Force = (mass)(acceleration)
using S.I Units:
N = (kg)(m/s²)
Therefore,
Pa = [(kg.m/s²)/m²]
Pa = kg/m.s²
A rectangular building lot has a width of 52.5 ft and a length of 136 ft. Determine the area of this lot in square meters.
Answer: A = l x w = 16.006 m x 41.344 m = 661.75 m²
Explanation:
Conversion first to meters and then the question is easy
How many ft in a meter? 1ft = .304 m
52.5 ft = 52.5 ft x .304m/ft = 16.006m
136 ft = 136 ft x .304 m/ft = 41.344m
What is the equation to find the area of a rectangular lot?
A = l x w = 16.006 m x 41.344 m = 661.75 m²
what is the speed of a truck that travels 10 km in 10 minutes?
Answer:
10 minutes: 10 km
1 minute: 10 ÷ 10 = 1 km
the speed of the truck is 1km/min
Answer:
1 kilometer/minute
Explanation:
If we want to find the speed, we must divide the distance by the time.
[tex]s= \frac {s}{t}[/tex]
The truck travels a distance of 10 kilometers in 10 minutes.
[tex]d= 10 km\\t=10 min[/tex]
Substitute the values into the formula and divide.
[tex]s=\frac{d}{t}[/tex]
[tex]s=\frac{10 km}{10min}[/tex]
[tex]s= 1 km/min[/tex]
The speed of the truck is 1 kilometer per minute.
Metal sphere A has a charge of −????. An identical metal sphere B has a charge of +2????. The magnitude of the electric force on sphere B due to sphere A is F. The magnitude of the electric force on A due to B must be:______.
Answer:
Force on Sphere A due to B = F
Explanation:
The electrostatic force between the two charges is given by the Coulomb's Law, by the following formula:
F₁₂ = kq₁q₂/r²
where,
F₁₂ = Force on charge 1 due to charge 2
k = Coulomb's Constant
q₁ = magnitude of charge 1
q₂ = magnitude of charge 2
r = distance between both the charges
Similarly, the force on charge 2 due to charge 1 is given by the following formula:
F₂₁ = kq₁q₂/r²
It is clear from the formula that the force of both the charges on each other due to the other charge are same. Therefore, in our case:
Force on Sphere A due to B = Force on Sphere B due to A
Force on Sphere A due to B = F
A wildebeest runs with an average speed of 4.0\,\dfrac{\text m}{\text s}4.0 s m 4, point, 0, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction for 15\,\text s15s15, start text, s, end text. What was its distance travelled in meters?
Answer:
60m
Explanation:
Answer: 60
Explanation: I got it right on Khan
An elevator moves downward in a tall building at a constant speed of 5.05 m/s. Exactly 5.75 s after the top of the elevator car passes a bolt loosely attached to the wall of the elevator shaft, the bolt falls from rest.
(a) At what time does the bolt hit the top of the still-descending elevator? (Assume the bolt is dropped at t = 0 s.)
(b) Estimate the highest floor from which the bolt can fall if the elevator reaches the ground floor before the bolt hits the top of the elevator. (Assume 1 floor ≌ 3 m.)
Answer:
Explanation:
The elevator is moving with uniform speed and bolt will fall with acceleration due to gravity g .
Displacement of elevator when bolt starts falling
= 5.05 x 5.75 = 29 m
Let after time t bolt reaches the elevator
in time t , displacement of bolt = 1/2 g t²
= .5 x 9.8 x t² = 4.9 t²
displacement of elevator = 5.05 t
position of elevator = 29 + 5.05 t
According to question ,
29 + 5.05 t = 4.9 t²
4.9 t² - 5.05 t - 29 = 0
t = 3 s approx .
b )
Distance covered by the bolt
= 1 /2 g t²
= .5 x 9.8 x 9
= 44.1 m
Bolt must have to fall from a height of 44.1 m
or in terms of floor it is
44.1 / 3 = 15 th floor .
Hunk travelled 540 km at an average speed of 90 km/h. If Tim completed the same amount of distance with 1 hour and 30 min less than Hunk, what was Tim's average speed for the whole journey? km/h
Answer:120
Explanation:it just is trust me
The final step of the decision-making model is: A-describe the situation B-weigh the pros and cons C-take action D-review your decision
Answer: D
Explanation: review your steps
Answer:
its d
Explanation:
Cool the matter back down to a solid state. How does its shape compare to its original shape?Why? *
Answer:
i am just answering what this guy said this answer isnt mine ok -v-/ Both soaps and emulsifiers contain only one nonpolar tail group Both soaps and emulsifiers consist of fatty acid chains and a polar head group Both soaps and emulsifiers work in the same manner
Soaps contain two polar tail groups, but emulsifiers have only one polar tail group ,Soaps contain only one nonpolar tail group, but emulsifiers have two nonpolar tail group
Which of the following is not a valid use of your driver's license?
proof of your ability to operate a motor vehicle
O proof of your age
O proof of your residency
proof that you have liability insurance
Answer:
Proof that you have liability insurance
Explanation:
Answer: The answer is proof that you have liability insurance
Explanation: