Question

13 of 13 Review | Constants | Periodic Table The minimum stopping distance for a car traveling at a speed of 30 m/s is 60 m , including the distance traveled during the driver's reaction time of 0.50 s . What is the minimum stopping distance for the same car traveling at a speed of 44 m/s ?

Answer #1

Constants | Periodic Table
Consider the reaction
A+2B⇌C
whose rate at 25 ∘C was measured using three different sets of
initial concentrations as listed in the following table:
Trial
[A]
(M)
[B]
(M)
Rate
(M/s)
1
0.50
0.050
1.5×10−2
2
0.50
0.100
3.0×10−2
3
1.00
0.050
6.0×10−2
Part a
Calculate the initial rate for the formation of C at 25 ∘C, if
[A]=0.50M and [B]=0.075M.
Express your answer to two significant figures and include the
appropriate units.
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Two cars are traveling on level terrain at 60 mi/h on a road
with a coefficient of adhesion of 0.8. The driver
of car 1 has a 2.5-s perception/reaction time and the driver of car
2 has a 2.1-s perception/reaction time.
Both cars are traveling side by side and the drivers are able to
stop their respective cars in the same distance
after first seeing a roadway obstacle (perception and reaction plus
vehicle stopping distance). If the braking
efficiency of...

When traveling 40 mph (miles per hour), the distance that it
takes Fred’s car to stop varies evenly between 120 and 155 feet.
(This includes the reaction distance and the braking distance.) All
of the questions are related to the stopping distance when Fred is
traveling 40 mph.
a) Let S be the distance it takes for Fred’s car to stop at when
traveling 40 mph. Find the distribution, parameter(s), and support
of S.
b) What is the probability that...

A car is traveling at 13.0 m/s, and the driver sees a traffic
light turn red. After 0.590 s (the reaction time), the driver
applies the brakes, and the car decelerates at 8.00 m/s2. What is
the stopping distance of the car, as measured from the point where
the driver first sees the red light?

Constants | Periodic Table
The following reaction was monitored as a function of
time:
A→B+C
A plot of ln[A] versus time yields a straight
line with slope −5.0×10−3 /s .
Part A
Part complete
What is the value of the rate constant (k) for this
reaction at this temperature?
Express your answer using two significant figures.
k =
5.0×10−3
s−1
Previous Answers
Correct
Part B
Part complete
Write the rate law for the reaction.
Rate=k
Rate=k[A]
Rate=k[A]2
Rate=k[A]3
Previous Answers...

Constants | Periodic Table The gas-phase reaction of NO with F2
to form NOF and F has an activation energy of Ea = 6.30 kJ/mol and
a frequency factor of A = 6.00×108 M−1⋅s−1 . The reaction is
believed to be bimolecular: NO(g)+F2(g)→NOF(g)+F(g)
What is the rate constant at 537 ∘C ? Express your answer to
three significant digits with the appropriate units. For compound
units, place a multiplication dot between units (e.g.
J⋅mol−1⋅K−1).

Coriolis' alternative method for finding work can be used to
estimate the relative stopping distance for a car given the car's
speed. For this application of Coriolis' alternative method, the
force of friction is in the opposite direction of the motion of the
car on which that frictional force is acting, and the "work
required to stop the car" (sometimes called "the work done by
friction") is equivalent to the amount of mechanical energy
converted to thermal energy by the...

9 of 14
Constants | Periodic Table
You may want to reference (Pages 295 - 299) Section 7.4 while
completing this problem.
Sulfuric acid dissolves aluminum metal according to the
following reaction:
2Al(s)+3H2SO4(aq)→Al2(SO4)3(aq)+3H2(g)
Suppose you wanted to dissolve an aluminum block with a mass of
15.7 g .
Part A
What minimum mass of H2SO4 would you need?
Express your answer in grams.
m =
81.1481.14
g
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Answer
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Part B
What mass...

A car that weighs 1.5 × 104 N is initially moving at
a speed of 42 km/h when the brakes are applied and the car is
brought to a stop in 18 m. Assuming that the force that stops the
car is constant, find (a) the magnitude of that
force and (b) the time required for the change in
speed. If the initial speed is doubled, and the car experiences the
same force during the braking, by what factors are...

A car that weighs 1.4 × 104 N is initially moving at
a speed of 35 km/h when the brakes are applied and the car is
brought to a stop in 18 m. Assuming that the force that stops the
car is constant, find (a) the magnitude of that
force and (b) the time required for the change in
speed. If the initial speed is doubled, and the car experiences the
same force during the braking, by what factors are...

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