Mechanical Energy and Electricity Calculations
- 1. You carry a 50N bag of lemons up a 8.0 m flight of stairs. How much work was done?
A) 6.25J
B) 3920J
C) 400N
D) 400J
- 2. Samuel uses 65 J of energy to move a 9.0 N object. How far did he move it?
A) 7.22m/s
B) 585m
C) 7.22m
D) 435m
- 3. Which, if either, requires more work, lifting a A) 100 N load a vertical distance of 2 m or lifting a B) 50 N load a vertical distance of 4 m?
A) It's the same
B) B
C) A
D) I need your help teacher
- 4. Egan Bernal uses 1500 Joules during 40 seconds. Find power
A) 60000W
B) 37.5N
C) 37.5 W
D) 0.026W
- 5. How much power does it take to lift 80.0 kg 20.0 m high in 10.00 s?
A) 1570 W
B) 15,70W
C) 2150 W
D) 1570J
- 6. Calculate the kinetic energy of a 20Kg soccer ball traveling at 15 m/s
A) 10 J
B) 2250 J
C) 150 J
D) 300 J
- 7. (a) Calculate the kinetic energy of a 70 kg rider that moves at 8.4 m/s. (b) Calculate the kinetic energy of the same guy at twice the speed.
A) A) 9878 J B) 2470 J
B) A) 294 B) 588
C) A) 2470 J B) 9878 J
D) A) 2470 N B) 9878 N
- 8. What is the mass of a horse that is running at 6.5 m/s and having 2000 J of Kinetic Energy?
A) 13000J
B) 94.7 Kg
C) 94.7 N
D) 307.69 Kg
- 9. Calculate the work done in lifting a 650.0 N barbell 3.3m above the floor. What is the gravitational potential energy of the barbell when it is lifted to this height?
A) 196.9 N
B) 196.9 J
C) 2145 N
D) 2145 J
- 10. A 1000 kg Elephant is coming down from the top of a 20.0 m. tall hill. How much potential energy did it have?
A) 196000J
B) 20000J
- 11. How high above the ground is a 32 kg bowling ball if it has 1700 joules of gravitational potential energy?
A) 5.42m
B) 53.1m
- 12. Two balloons are charged with an identical quantity and opposite charges: (6.25C) & (-6.25 C). They are held apart at a separation distance of 0.617m. A) Determine the magnitude of the ELECTRICAL FORCE of attraction between them. Then another charged balloon (7.5C) is getting closer to test the electric field produced by the two initial balloons. B) What is the strength of the electric Field?
Remember ----> K= 9000000000 N•m2/C2
A) A)123,132,005,390.2267 N B)923,490,040,426.7 N/C
B) A) 90000000000000000 J B) 1230000000000000 N
C) A) 923,490,040,426.7 N B) 123,132,005,390.2267 N/C
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