Question 4 A car is fitted with a flywheel connected to the drive shaft. The flywheel spins with the drive shaft. In this way, the fly wheel can be used to store energy. The car has a mass of 800 kg. The fly wheel consists of a uniform disk with mass 20 kg and diameter I m. When the car moves at a speed of 80 km h-1the fly wheel rotates with angular velocity 260 rev s-1. Starting from rest, the car descends down a 1500 m-long hill with a 5° slope. Assume that no energy is lost to friction and that the car's wheels are approximately massless. (a) What is the speed of the car at the bottom of the slope? W=260 2.22m kg 150om Cirenmference - T1 m IS00 20ug spins times vニn?+2a」 of cur mg Im 3 cos (5) fuet = fg sin(5) Fret 5:1500 4:0 V 50.62 = 683.3 N Fnet -ma : 68 3.3 433.3 800 :0.85413 ms? (b) What is the angular acceleration of the fly wheel just before the car reaches the bottom of the hill? Fined t:
Question 4 A car is fitted with a flywheel connected to the drive shaft. The flywheel spins with the drive shaft. In this way, the fly wheel can be used to store energy. The car has a mass of 800 kg. The fly wheel consists of a uniform disk with mass 20 kg and diameter I m. When the car moves at a speed of 80 km h-1the fly wheel rotates with angular velocity 260 rev s-1. Starting from rest, the car descends down a 1500 m-long hill with a 5° slope. Assume that no energy is lost to friction and that the car's wheels are approximately massless. (a) What is the speed of the car at the bottom of the slope? W=260 2.22m kg 150om Cirenmference - T1 m IS00 20ug spins times vニn?+2a」 of cur mg Im 3 cos (5) fuet = fg sin(5) Fret 5:1500 4:0 V 50.62 = 683.3 N Fnet -ma : 68 3.3 433.3 800 :0.85413 ms? (b) What is the angular acceleration of the fly wheel just before the car reaches the bottom of the hill? Fined t:
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please answer Part B only, thnks.
Transcribed Image Text:Question 4
A car is fitted with a flywheel connected to the drive shaft. The flywheel spins with
the drive shaft. In this way, the fly wheel can be used to store energy. The car has a
mass of 800 kg. The fly wheel consists of a uniform disk with mass 20 kg and diameter
I m. When the car moves at a speed of 80 km h-1Tthe fly wheel rotates with angular
velocity 260 rev s-1. Starting from rest, the car descends down a 1500 m-long hill with
a 5° slope. Assume that no energy is lost to friction and that the car's wheels are
approximately massless.
(a) What is the speed of the car at the bottom of the slope?
22.22m,ky
4-
W=260
150om
Ciremmterence
20ug
spins
I500
times
vニn?+2a)
7g of
car
mg
Im
V=Ju²+2as
s cos (s)
fuet = fg sin(s)
= (8 00) (9.8)5inc5).
Frst
5:1500
4:0
V 50.62 ms'
=683.3N
Frut -ma =
68 3.3
800
(b) What is the angular acceleration of the fly wheel just before the car reaches the
bottom of the hill?
Find t:
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