Question

A car is traveling at 15 m/s on a horizontal road. The brakes are applied and the car skids to a stop in 4.0 s. The coefficient of kinetic friction between the tires and road is:

Select one:

a. 0.38

b. 0.69

A ball is thrown straight up with a speed of 36.0 m/s. How long does it take to return to its starting point?

Select one:

a. 7.20 s

b. 10.2 s

c. 14.7 s

d. 11.0 s

e. 3.67 s

A car, initially at rest, travels 20 m in 4 s along a straight
line with constant acceleration. The acceleration of the car
is:

Select one:

a. 4.9 m/s^{2}

b. 0.4 m/s^{2}

c. 2.5 m/s^{2}

d. 9.8 m/s^{2}

e. 1.3 m/s^{2}

c. 0.92

d. 0.76

e. 1.11

The result of adding 1 mm to 1 cm in SI units is

Select one:

a. 1.1×10^{-3} m

b. 1.1×10^{-4} m

c. 2.0×10^{-2} m

d. 1.1×10^{-2} m

e. 2.1×10^{-2} m

Answer #1

A car of mass 772 kg is traveling 26.4 m/s when the driver
applies the brakes, which lock the wheels. The car skids for 4.47 s
in the positive x-direction before coming to rest.
HINT
(a)
What is the car's acceleration (in m/s2)? (Indicate
the direction with the sign of your answer.)
m/s2
(b)
What magnitude force (in N) acted on the car during this
time?
N
(c)
How far (in m) did the car travel?
m

A car traveling at
17.2 m/s skids to a stop in 188 m from the point where the brakes
were applied.
In what distance would
the car have stopped had it been going 58.5 m/s , if tires and road
condition were unchanged (i.e. if the acceleration were the
same)?

On a horizontal road, a car is traveling West at a constant
speed of 11.4 m/s . After 16 s , it has rounded a corner and is now
heading North at a constant speed of 16.0 m/s .
What is the magnitude of the car's average acceleration during
this 16 s time interval?
0.29 m/s2
1.2 m/s2
0 m/s2
1.7 m/s2

A car traveling at 18.0 m/sm/s skids to a stop in 28.5 mm from
the point where the brakes were applied.
In what distance would the car have stopped had it been going
59.4 m/sm/s , if tires and road condition were unchanged (i.e. if
the acceleration were the same)?

A car, 1110 kg, is traveling down a horizontal road at 20.0 m/s
when it locks up its brakes. The coefficient of friction between
the tires and road is 0.901. How much distance will it take to
bring the car to a stop?

Traveling at 40.2 m/s, a driver applies the brakes to his
fast-moving car and skids out of control on a wet concrete
horizontal road. The 2000 kg car is headed directly toward a
student waiting to catch a bus to campus who is standing 58.0 m
down the road. Luckily, Superman is flying overhead and surveys the
situation. Knowing that the coefficient of kinetic friction between
rubber and rough wet concrete is .800, he determines that friction
alone will not...

A 2300 kg car moving at an initial speed of 25 m/s along a
horizontal road skids to a stop in 50 m. (Note: When stopping
without skidding and using conventional brakes, 100 percent of the
kinetic energy is dissipated by friction within the brakes. With
regenerative braking, such as that used in hybrid vehicles, only 70
percent of the kinetic energy is dissipated.)
(a) Find the energy dissipated by friction. 718750 Incorrect:
Your answer is incorrect. kJ
(b) Find...

On a horizontal road, a car is traveling West at a constant
speed of 7.60 m/s After 32 s , it has rounded a corner and is now
heading North at a constant speed of 12.9 m/s. What is the
magnitude of the car's average acceleration during this 32 s time
interval?

On a horizontal road, a car is traveling West at a constant
speed of 12.0 m/s. After 52 s, it has rounded a corner and is now
heading North at a constant speed of 22.8 m/s.
What is the magnitude of the car's average acceleration during
this 52 ss time interval?

A car is traveling along a straight road at a velocity of +35.0
m/s when its engine cuts out. For the next ten seconds the car
slows down, and its average acceleration is a1. For the next five
seconds the car slows down further, and its average acceleration is
a2. The velocity of the car at the end of the fifteen-second period
is +24.2 m/s. The ratio of the average acceleration values is a1/a2
= 1.78. Find the velocity of...

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