17) Determine the work, in J, required to stop a 1500-kg car traveling at 30 m/s....
17) Determine the work, in J, required to stop a 1500-kg car traveling at 30 m/s. (hint: use the work-energy theorem).
a) 2.4 x 105
b) 8.2 x 105
c) 1.7 x 105
d) 6.8 x 105
Answer_______________
18) 10 J of heat are removed from a gas sample while it is being compressed by a piston that does 30 J of work. Determine, in J, the change in thermal energy of the system.
a) 4
b) 10
c) 20
d) 3
Answer_______________
19) It is possible for a device to transform a given amount of heat completely into work.
a) true
b) false
Answer_______________
20) The density of a block of iron is 7,860 kg/m3. The density of mercury is 13,950 kg/m3. This block of iron will:
a) float in mercury
b) sink in mercury
c) hang motionless in mercury
d) none of the above
Answer_______________
Homework Answers
17. Work = change in kinetic energy
W= .5*1500*30^2
W= 675000 j
Option d is correct
Add Answer to:
17) Determine the work, in J, required to stop a 1500-kg car
traveling at 30 m/s....
18) 10 J of heat are removed from a gas sample while it is being compressed...
18) 10 J of heat are removed from a gas sample while it is being compressed by a piston that does 30 J of work. Determine, in J, the change in thermal energy of the system. a) 4 b) 10 c) 20 d) 3 Answer_______________ 19) It is possible for a device to transform a given amount of heat completely into work. a) true b) false Answer_______________ 20) The density of a block of iron is 7,860 kg/m3. The density...
18) 10 J of heat are removed from a gas sample while it is being compressed...
18) 10 J of heat are removed from a gas sample while it is being compressed by a piston that does 30 J of work. Determine, in J, the change in thermal energy of the system. b) 10 c) 20 d) 3 Answer 19) It is possible for a device to transform a given amount of heat completely into work. a) true b) false Answer 20) The density of a block of iron is 7,860 kg/m”. The density of mercury...
20) The density of a block of iron is 7,860 kg/m². The density of mercury is...
20) The density of a block of iron is 7,860 kg/m². The density of mercury is 13,950 kg/m² This block of iron will: a) float in mercury b) sink in mercury c) hang motionless in mercury d) none of the above
A lead block of mass 7.0 kg is originally at a temperature of 15°C and 1 atm. It is then heated to a temperature of 64°...
A lead block of mass 7.0 kg is originally at a temperature of 15°C and 1 atm. It is then heated to a temperature of 64°C without any change in pressure. The specific heat of lead is 128 J/(kg - °C), its density is 1.13 x 104 kg/m3, and the coefficient of linear expansion is 29 x 10 -6/oC (a) Determine the work done by the lead block (b) How much heat energy is transferred during this process? J (c)...
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1) A 3.00 g bullet traveling horizontally at 400 m/s hits a 3.00 kg wooden block which is initially at rest on a smooth horizontal table. The bullet buries itself in the block without passing through. The speed of the block after the collision is a) 0.4 m/s. b) 1.2 m/s. c) 2.0 m/s. d) 2.8 m/s. e) 3.6 m/s. 2) What type of collision was seen in the previous problem? a) elastic collision b) inelastic collision c) perfectly elastic...
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How much energy does it take to stop a 1500 kg car traveling at 50 m/s in 15 s? A) 1 MJ B) 2 MJ C) 3 MJ D) 4 MJ Show work please!
A 1,210 kg car going 32 m/s is brought to a stop using its brakes. Let's...
A 1,210 kg car going 32 m/s is brought to a stop using its brakes. Let's assume that a total of approximately 28 kg of iron in the brakes and wheels absorbs the heat produced by the friction. (a)What was the car's original kinetic energy (in J)? ________J (b)After the car has stopped, what is the change in temperature (in °C) of the brakes and wheels? ________ °C
A steel block of mass 6.4 kg is originally at a temperature of 18°C and 1...
A steel block of mass 6.4 kg is originally at a temperature of
18°C and 1 atm.
A steel block of mass 6.4 kg is originally at a temperature of 18°C and 1 atm. It is then heated to a temperature of 68°C without any change in pressure. The specific heat of steel is 452 J/(kg . °C), its density is 7.85 x 103 kq/m3, and the coefficient of linear expansion is 12 x 10-6/oc. (a) Determine the work done...
1) the kinetic energy of a 15.2 kg object traveling at 8.49 m/s is ___ J....
1) the kinetic energy of a 15.2 kg object traveling at 8.49 m/s is ___ J. 2) A 437.2 g sample of an unknown substance requires 8460 J to increase its temperature from 19.3 oC to 68.9 oC. The specific heat of the substance is ___ J/g oC. 3) A 437.2 g sample of an unknown substance requires 8460 J to increase its temperature from 19.3 oC to 68.9 oC. According to table 5.1 in the text, the sample may...
2) Suppose a woman does 550 J of work and dissipates 9800 J of heat in...
2) Suppose a woman does 550 J of work and dissipates 9800 J of heat in the process. (a) What is the decrease in her internal energy, assuming no change in temperature or consumption of food? (That is, there is no other energy transfer.) Express your answer in kcal. kcal (b) What is her efficiency? % 3) (a) How long will the energy in a 310 kcal cup of yogurt last in a woman doing work at the rate of...
18) 10 J of heat are removed from a gas sample while it is being compressed by a piston that does 30 J of work. Determine, in J, the change in thermal energy of the system. b) 10 c) 20 d) 3 Answer 19) It is possible for a device to transform a given amount of heat completely into work. a) true b) false Answer 20) The density of a block of iron is 7,860 kg/m”. The density of mercury...
20) The density of a block of iron is 7,860 kg/m². The density of mercury is 13,950 kg/m² This block of iron will: a) float in mercury b) sink in mercury c) hang motionless in mercury d) none of the above
A lead block of mass 7.0 kg is originally at a temperature of 15°C and 1 atm. It is then heated to a temperature of 64°C without any change in pressure. The specific heat of lead is 128 J/(kg - °C), its density is 1.13 x 104 kg/m3, and the coefficient of linear expansion is 29 x 10 -6/oC (a) Determine the work done by the lead block (b) How much heat energy is transferred during this process? J (c)...
A steel block of mass 6.4 kg is originally at a temperature of
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A steel block of mass 6.4 kg is originally at a temperature of 18°C and 1 atm. It is then heated to a temperature of 68°C without any change in pressure. The specific heat of steel is 452 J/(kg . °C), its density is 7.85 x 103 kq/m3, and the coefficient of linear expansion is 12 x 10-6/oc. (a) Determine the work done...
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