Answer:
the circuit must be closed
Explanation:
Choice 'b' is one possible way to state
Newton's second law of motion.
The other choices are meaningless.
Each pulley reduces the extra effort compulsory to lift the
elephant (light and 100% efficiency). If the elephant "weighs" 27,800
N and the person can apply 700 N,
27,800 / 700 = 39.7 which is about 40 N.
The answer that offers a combined # of 40 pulleys is computed by:
40 / 2 = 20
Therefore the answer is 20 fixed and 20 moveable.
Answer:
35meV
Explanation:
To find the average translational kinetic energy you use the followinf formula:
K_B: Boltzman' constant = 1.38*10^-23 J/K
T: standard temperature = 273.15K
By replacing these values you obtain:
in eV you have:
5.65*10^-12(6.242*10^18eV)=0.035eV=35meV
Hence, the average translational energy is 35meV