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SPH3U

Unit Test #3 – Energy

Name: ________________

Instructions:

1. Read each question carefully before answering. 2. Express all final answers with the correct number of significant digits. 3. Calculators may not be shared. No iPod or Smartphone calculators. 4. Good Luck !!

/ 14 C1.3 I can solve problems related to work, force, and displacement.

1. The capacity to do work is known as: a) energy b) heat c) work d) efficiency

2. The unit of work is the joule (J) which is equivalent to: a) kg•m/s2 b) watt c) kg•m/s d) kg•m2/s2

3. The type of energy possessed by moving objects is:

a) kinetic energy b) potential energy c) chemical energy d) work energy

4. How much more kinetic energy would a vehicle have if its velocity was doubled? a) half b) double c) quadruple d) no change

5. A student lifts a 216 N box onto a shelf that is 2.00 m above the ground. How much work is done

on the box? a) 132 J b) 232 J

c) 432 J d) 832 J

6. The kinetic energy of a 10 kg mass is 405 J. Find its speed. a) 4.5 m/s b) 6 m/s c) 6.4 m/s d) 9 m/s

Test Score Parent/Guardian Signature / 53 %

o

O

: ¥2

o

0 Ekin⇒?u

SPH3U 7. A force of 60.0 N acts on a block at an angle of 30.0⁰ relative to the ground. The block moves a

horizontal distance of 3.0 m. How much work is done by the applied force? (2 marks) 8. A 2500 kg truck travelling at 72 km/h slams on the brakes and skids to a stop. The frictional force

from the road is 7900 N. Use the relationship between kinetic energy and mechanical work to determine the distance it takes for the truck to stop. (6 marks)

/ 8 C1.6 I can conduct inquiries and solve problems involving power, energy, time, and work.

9. A forklift inputs 5200 J of energy in order to lift a 50.0 kg mass to a height of 4.0 m at a constant speed.

What is the efficiency of the forklift? (4 marks)

10. How long would it take a motor with 0.50 kW of power to do 1200 J of work ? (2 marks)

W-tFcosobd-C6oDkos30X3YWs160JEkss0W-aEkEki.2@okgX2onsIm-2so0kgz72tf.20m1sEkii500ooJFT9ooNW-Fdd5o0oooJ-790oNDdAd-5oooookgmIsid-63mT90kYHohEffsWwwut_x1oo9oWw-S2ooJ4oEft-1960Wout-mghqooXk09o-fokgX9.8ggX4ax4otfft389otl960Jmx1ooo-5oowaHsP.hfngat.h

,E200J

at=24ssA

SPH3U 11. A 60.0 kg person accelerates from rest to 11 m/s in 6.5 s. What is the person’s power? (2 marks)

/ 10 C1.4 I can use the law of conservation of energy to solve problems.

12. A 250 kg roller coaster cart loaded with people has an initial velocity of 3.0 m/s at the top of the first

hill. Determine the velocity of the cart at A, B, and C. Note you must use a conservation of energy method to solve this problem !!!! ( 10 marks )

W --DEk±Ekf P=¥+aEk=@ksµHD2

-

2A£k=363oy

10=363056.5

P=s6:HA

Eni'Eg*k• Eg#okDt8%D(Rn)Eg= 29400J

Ek= 155475J -29400J

Ek= 126075J

AttopoftrHHH_ E←m£ AfcEk

.fm#3nD3v=fmEfHYS

Ek=H2sJ V=2lMsg#6so0l

Eg=(250#98n§(63n ) v=32m|s

Eg= 1543505 At B

En=u2sJtF43505E#0x98⇒(38n)

Ems1554755Eg= 93100J

Ek . 155475-93100Ek = 62375J v=22m1s

SPH3U

/ 21 C1.8 I can solve problems involving changes in temperature and changes of state.

13. The amount of energy the must be added to substance to raise 1.0kg of the substance by 10C

is the substance’s: a) temperature b) thermal energy c) specific heat capacity d) kinetic energy

14. -2730 C is known as: a) latent heat of fusion b) specific heat capacity c) the freezing point d) absolute zero

15. At 646m above sea level water boils at 980C. What is this temperature in kelvin?

a) 371 K b) 212 K c) 0 K d) - 175 K

16. In the past, scientists believed that warmth and coldness were produced by a massless fluid called:

a) kelvin b) caloric c) kinetic energy d) thermal energy

17. The amount of thermal energy needed to change 1 kg of ethyl alcohol from a liquid to a gas is

its: a) specific heat capacity b) kinetic energy

c) specific latent heat of vaporization d) specific latent heat of fusion

18. Two different liquids at different temperatures are mixed in a thermally insulated container. The final temperature of the mixture will depend on:

a) the mass of each liquid b) the initial temperature of each liquid c) the specific heat capacity of each liquid d) all of the above

19. Calculate how much thermal energy is needed to change 400.0 g of ice at -2.00C into steam at 101.00C. (10 marks)

o

o0 273+98=3:0

0 Q=mcDT

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to.us#xkEJiD=E4ksX3.4xohIfQi=168oJQz=136oooJ

Q *s=@4kg)(4l8g⇒(101°C)

Q+s= 168 872 J

Qi.dk#.3xlo6ED

Qy = 920 000J

Q ,= 1680J t 136 000J + 168 872J

t 920000 J

Q+= 1226552J.

.

.Qt = 1.2×106 J

SPH3U

20. A 0.20 kg piece of aluminum at 375.00C is placed in 0.30 kg of water at 15.00C to be cooled quickly. Determine the final temperature of the aluminum and water. (5 marks)

QT9HwmDQgainedtuatefm.o.2kgm-O.3kgTi-375.CTi-1siasTEETrxiiHkicaHoooHkgiDTiCTf-37JaIEtofQusI@2X92Dltt.37DQgaixdiG.D

fnsffs:D=1846-379=12544+-14

Qu+=l84Tf - 69000 Qjaed=l2s4Tf-18810

l84Tf -69000+125417-18810=0

143817=87810

Tf = 878¥÷61°C

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