How is the mass hung on the spring related to the force that actually stretches the spring?
The force that Earth exerts on the hanging mass is called weight. The weight of the
mass is the actual force that stretches the spring. Weight = mg, where g is the
acceleration of gravity, 9 8 . m s2 .
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Springs: An ideal spring with a spring constant (force constant) of 22 N/m is stretched from equilibrium to 2.9 m. How much work is done in the process?
A. 93 J B. 186 J C. 47 J D. 121 J
A particle (mass = 5.0 g, charge = 40 mC) moves in a region of space where the electric field is uniform and is given by Ex = 2.5 N/C, Ey = Ez = 0 . If the velocity of the particle at t = 0 is given by vy = 50 m/s, vx = vz = 0, what is the speed of the particle at t = 2.0 s?
a. 81 m/s b. 72 m/s c. 64 m/s d. 89 m/s e. 25 m/s
The hydrogen in the universe was formed by
a. the energy of the Big Bang c. radioactive decay of heavy elements b. nuclear fusion reactions in stars d. none of the above
Inductive reactance XL is given by
a. L? b. L/? c. 1/L? d. ?/L e. ?2L