Kinetics & Thermodynamics- exam 2
1. SI unit for energy
Answer Joules (J)
2. Calorie
Answer amount of energy to raise the temp of 1 g of H2O from 14.5 C to 15.5 C
3. 1 cal = ? J
Answer 4.184
4. food calorie = ? = ? cal
Answer kilocalorie, 1000
5. little "c" = ?
Answer calorie
6. big "C" = ?
Answer kilocalorie (1000 cal/little "c")
7. kinetic energy is the to ?
, Answer work, move
8. SI unit for kinetic energy
Answer joule (J)
9. kinetic energy is dependent on what?
Answer mass of the object and the speed achieved
10. Work-Kinetic Energy Theorem is ?
Answer net or total work done on a system is equal to the system's change in kinetic energy
11. Work (SI unit?) is what?
Answer (J) is the energy transferred when a force applied to an object displaces it in the same direction
12. Power (SI unit?) is what?
Answer (J/s) is the rate at which work is done (energy is expended)
13. equation for work
Answer W = F x d W = force x
distance
F = mass x acceleration (SI unit is Newtons/N)
,14. equation for force and SI unit
Answer F = mass x acceleration (N)
15. equation for power
Answer P = W/t W = work (J)
t = time
16. ex. problem
60 seconds, 10 meters, 20 N of force, what is power?
Answer have time, have distance, have force. Find Work 1st
W = 20 N x 10 meters = 200 J.
Now plug into Power equation
P = 200 J / 60 seconds = 3.33 J/s
17. work against the force of friction = ? bc force applied in object is
being .
Answer resistance, same direction, displaced
18. work against the force of gravity = = force to the object
, .
Answer Newton's Law, required, lift, up.
19. no, bc W = Fxd and no distance (bc friction/resistance) so no work
Answer if man can't move the box at all, is any work actually being done? Y/N, why?
1. SI unit for energy
Answer Joules (J)
2. Calorie
Answer amount of energy to raise the temp of 1 g of H2O from 14.5 C to 15.5 C
3. 1 cal = ? J
Answer 4.184
4. food calorie = ? = ? cal
Answer kilocalorie, 1000
5. little "c" = ?
Answer calorie
6. big "C" = ?
Answer kilocalorie (1000 cal/little "c")
7. kinetic energy is the to ?
, Answer work, move
8. SI unit for kinetic energy
Answer joule (J)
9. kinetic energy is dependent on what?
Answer mass of the object and the speed achieved
10. Work-Kinetic Energy Theorem is ?
Answer net or total work done on a system is equal to the system's change in kinetic energy
11. Work (SI unit?) is what?
Answer (J) is the energy transferred when a force applied to an object displaces it in the same direction
12. Power (SI unit?) is what?
Answer (J/s) is the rate at which work is done (energy is expended)
13. equation for work
Answer W = F x d W = force x
distance
F = mass x acceleration (SI unit is Newtons/N)
,14. equation for force and SI unit
Answer F = mass x acceleration (N)
15. equation for power
Answer P = W/t W = work (J)
t = time
16. ex. problem
60 seconds, 10 meters, 20 N of force, what is power?
Answer have time, have distance, have force. Find Work 1st
W = 20 N x 10 meters = 200 J.
Now plug into Power equation
P = 200 J / 60 seconds = 3.33 J/s
17. work against the force of friction = ? bc force applied in object is
being .
Answer resistance, same direction, displaced
18. work against the force of gravity = = force to the object
, .
Answer Newton's Law, required, lift, up.
19. no, bc W = Fxd and no distance (bc friction/resistance) so no work
Answer if man can't move the box at all, is any work actually being done? Y/N, why?
