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1. At room temperature, an oxygen molecule, with a mass of 5.31 x 10 ^ 鈥?26 kg, typically has a kinetic energy of about 6.21 x 10 ^ 鈥?21 J. How fast is it moving?
2. How much work is required to stop an electron with mass 9.11 x 10 ^ 鈥?31 kg which is moving at a speed of 1.70 x 10 ^ 6 m/s?
3. How long will it take a 1750 W motor to lift a 285 kg piano to a sixth story window that is 16.0 m above?
4. A 50 kg mass is raised 5 m above ground level
(a) What is its change in gravitational potential energy?
(b) What is the change in gravitational potential energy per unit mass?
5. A 100 kg mass is raised 5 m above ground level
(a) What is its change in gravitational potential energy?
(b) What is the change in gravitational potential energy per unit mass, Vg?
6. A 150 kg mass is raised 5 m above ground level
(a) What is its change in gravitational potential energy?
(b) What is the change in gravitational potential energy per unit mass, Vg?
7. Repeat the calculations in question 6 assuming the mass is
(a) 200 kg
(b) 250 kg
PLEASE NEED HELP! - Energy Questions - Physics I - class?
I think you need to pay attention in class or read the book.
PLEASE NEED HELP! - Energy Questions - Physics I - class?
1)
[1/2] {5.31 x 10 ^ 鈥?26} V^2 = 6.21 x 10 ^ 鈥?21 J
Calculate V.
2)
[1/2 {9.11 x 10 ^ 鈥?31}[ 1 .70 x 10 ^ 6] ^2 = Work
3]
1750 W = 285 X 16 x time
Calculate time.
For 4, 5, 6,
Change in potential energy is [mgh.]
Cahnge in potential energy per unit mass is mgh / m = gh.
