Question

A 60 kg bicyclist rides his 10.1 kg bicycle with a speed of 13.8 m/s.

(a) How much work must be done by the brakes to bring the bike and rider to a stop? kJ

(b) How far does the bicycle travel if it takes 5.3 s to come to rest? m

(c) What is the magnitude of the braking force? N

Answer #1

A 85 kg bicycle and rider initially move at 15 m/s up a
10degreehill. The rider slams on the brakes and skids to rest. The
coefficient of friction is (0.8,0.7). how far does the bike skid ,
time elapsed before kid stop skidding

A 85 kg bicycle and rider initially move at 15 m/s up a 100
hill. The rider slams on the brakes and skids to rest. The
coefficient of friction is (0.8,0.7). how far does the bike skid ,
time elapsed before kid stop skidding

A 85 kg bicycle and rider initially move at 15 m/s up a 10degree
hill. The rider slams on the brakes and skids to rest. The
coefficient of friction is (0.8,0.7). how far does the bike skid ,
time elapsed before kid stop skidding.

A bicyclist is finishing his repair of a flat tire when a friend
rides by with a constant speed of 4.0 m/s . Two seconds later the
bicyclist hops on his bike and accelerates at 2.3 m/s2 until he
catches his friend.
Part A
How much time does it take until he catches his friend (after
his friend passes him)?
Express your answer using two significant figures.
t =
s
Part B
How far has he traveled in this time?...

Spectators watch a bicycle stunt rider travel off the end of a
55.0° ramp, rise to the top of his trajectory and, at that instant,
suddenly push his bike horizontally away from him so that he falls
vertically straight down, reaching the ground 0.600 s later. How
far (in m) from the rider does the bicycle land if the rider has a
mass mrider = 70.0 kg and the bike has a mass mbike = 13.5 kg?
Neglect air resistance...

A 975-kg van decelerates to rest from a speed of 82.5 km/h in a
distance of 150 m. Presume the van is initially traveling in the
positive direction.
A )If the brakes are the only thing making the van come to a
stop, calculate the force (in newtons, in a component along the
direction of motion of the van) that the brakes apply on the
van.
B) Suppose instead of braking that the van hits a concrete
abutment at full...

A 1000 kg car is driving at a speed of 35 m/s on flat level
ground. A road hazard ahead causes the driver to slam on the
brakes, and the tires start to skid. a) If the pavement is dry (and
thus μk = 0.7) how far will they travel before coming to a stop? b)
If the pavement is wet, μk is reduced to 0.3. Now how far would
they travel before coming to a stop?

A 0.294 kg mass slides on a frictionless floor with a speed of
1.25 m/s. The mass strikes and compresses a spring with a force
constant of 42.2 N/m. How far does the mass travel after contacting
the spring before it comes to rest? How long does it take for the
spring to stop the mass?

Section B
a. A bicycle and a rider have a combined mass of 175 kg. How
many calories of heat are generated in the brakes when the bicycle
comes to a stop from a speed of 20 m/s? Take 4.18 J =1cal
b. If
all the energy is trapped in a 1.5 kg aluminum bag without any
heat loss, how much will
its temperature increase (DT) ? c = 0.220 cal/g°C.

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

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