Final Exam - 4 Questions on University Physics I | PHYS 2050, Exams of Physics

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XF.

A

PHYS-113(4) (Kaldon-40519)

Name ______________________________________________

Final Exam - 000,000 pointsWMU - Fall 2006

Section:

3a

3b

3c

3d

Sample Final Exam from Another Course

A to G

H to M

N to S

T to Z

Rev. 12/09/

years ago for the 69 1.) It was a miserable, wet, rainy Saturday and Sunday in France five 24 Heures du Mans – Circuit de la Sarthe (60,000 points)

th 24 Hours of Le Mans. The number 1 and 2 Audi’s

cold side of the engine is(b) The eighth finisher and winner of the GTS class was the number 63 Chevrolet Corvette C5-R. If thespeed of these race cars?(12,870 m) course in 3 minutes 48 seconds. (a) What was the averagefinished first and second. At one point they raced around the eight mile

T

C^ = 221°F = 105°C = 378 K

and the Carnot efficiency of this engine is

0.

(55.0%), then what is the temperature of the hot side of this heat engine,

T

H ?

you might be able to come up with an estimate of the Second Law Efficiency with this information.that loss down to 110 hp and you’d have a 620 hp (462.5 kW) engine. If you think about this carefully,The engine actually makes 730 hp (544.6 kW), but 130 hp of that is needed just to turn the engine! Get(c) They talked about “parasitic engine losses” in the Corvettes. The factory rates the engine at 600 hp.

Hint:

You can always substitute Power for Energy in the efficiency equations.

Physics 2050 / Final Exam [Form-A]

Summer I 2006

Page 2

(d) If the C5-R Corvette weighs 2510 pounds,

(^) m = 1141 kg

, and

0.893 and 1.03, then what is the minimum braking distance from 100 mph (44.7 m/s) to zero?(f) If the coefficients of friction between the special Goodyear racing tires and the paved racecourse aremph (44.7 m/s)? (e) If you assume that acceleration is constant, then how far (distance) does it take to go from zero to 100 acceleration is constant or not. Note: If you use Energy, then it doesn’t matter if the long (time) does it take to go from zero to 100 mph (44.7 m/s)?the 620 hp (462.5 kW) engine is used at full power, then how

C5-R Specs

Displacement LS-1 Pushrod V8 with Aluminum Block and Heads Engine:

: 427 cid

Intake System:

(^) Electronic Sequential Fuel

Compression Ratio Injection

: 12.5:

Horsepower

: 620bhp @ 6400RPM

Torque

: 495lb/ft @ 5200RPM

Transmission

: 6-Speed Manual with Drop Gear

Final Drive Ratio

: 3.11:

Curb Weight

: 2510 lbs.

Fuel Capacity

: 100 liters

Brakes

: 4-wheel vented monoblock calipers

w/carbon rotors & pads

Physics 2050 / Final Exam [Form-A]

Summer I 2006

Page 3

An Exercise in Exercise

(50,000 points)

located at the center of the circle (+). Which of the following tensions, Tresistance”. One way is use an off-center rotating cam with a mass hanging off of it. The pivot point is(b) A better form of exercise, according to the makers of Nautilus™ and other gear, is “progressivemeters?pounds (50.0 kg mass), then how work does it take to lift the weights 2.50 2.) Lifting weights is one form of exercise. (a) If the weights total 110.

1 or T

2 , is

greater

? Why?

spring constantfrom its equilibrium position produces the same force as the 110. pound weight in part (a), what is the (c) Another progressive resistance system uses springs. If pulling on the spring to a distance of 1.00 m

k ?

part (a), what is the Young’s modulusunstretched position produces the same force as the 110. pound weight in1.00 cm thick. If pulling on the bands to a distance of 15.0 cm from the(d) Another machine uses really big rubber bands that are 10.0 cm wide and

Y

of the material?

the same force as the 110. pound weight in part (a), what is the gauge pressurecylinder. If the piston is one inch in diameter (2.54 cm) and compressing the gas in the cylinder produces(e) Finally, a gas piston in a closed cylinder can be compressed to increase the gas pressure inside the

P

inside the cylinder?

Physics 2050 / Final Exam [Form-A]

Summer I 2006

Page 4

total mass of 5550 kg, find the change in the Potential Energy,Wonder of the World” – which is 1465 feet (447 m) above the ground. (a) If the express elevator has ain the day she visited the Sky Pod – the “World’s Highest Observation Deck at the CN Tower, Canada’s 3.) Mrs. Dr. Phil just got back last night from a conference in Toronto, Ontario, Canada. Earlier And Now From the Land of Hockey And SARS, eh? (50,000 points)

P.E., as the elevator goes from ground to

to the ground from the Sky Pod level.(c) Calculate the final speed that any object – water, the elevator, a tourist’s camera – will free fallpressure in the column of water is necessary to get the water 1465 feet (447 m) above the ground?(b) If water to the bathroom on the Sky Pod level is pumped up from the ground, what gaugeSky Pod.

Assume no air resistance, as usual.

League fastball straight out – with (d) One of Toronto Blue Jay baseball players is invited up to the Sky Pod level and throws a Major

v 0x

= 45.0 m/s (101 mph)

. How far does it travel horizontally

before it first hits the ground?

Again, ignore air resistance.

(e) A week from today, July 1

st , is Canada Day – the Canadians’ equivalent of the American 4

th of July.

at timeyellow starburst) at the same height as the Sky Pod. Find the vector velocity of the shellTower. One of the shells is shot straight up and comes to a stop (and exploding into a lovely red andDuring the festive celebrations, fireworks are shot off in the CN Railways yard that surrounds the CN

t = 0

.

Physics 2050 / Final Exam [Form-A]

Summer I 2006

Page 5

Just Four More Little Problems… (40,000 points)

†

4.) (a) A wheel is turning with

= 14.6 rad/sec²

under a torque



= 1330 N ·m

. What is the moment of

inertia,

I

, of the wheel?

(c) A small boy throws a stone into the air at an angleafterward. One of the cars has a mass 500. kg more than the other. Find the masses of both cars.(b) Two vehicles crash head-on inelastically, each traveling at 20.0 m/s. The wreck moves at 2.00 m/s



. It lands at the same height that it was launched

(d) What was the original launch speed,from, 15.3 m away horizontally and in a time of 2.21 seconds. How high does the stone go?

v 0 , of the stone?

† NOTE: Question 4 has only 4 parts because Question 1 has 6 parts. These questions come from several old exams.