Newton's Second Law in 1 Dimension: A 40-kg crate is being lowered with a downward acceleration is 2.0 m/s2 by means of a rope.(a) What is the magnitude of the force exerted by the rope on the crate?(b) What would be the magnitude of the force exerted by the rope if the crate were being raised with an acceleration of 2.0 m/s2?
Fill in the blank(s) with the appropriate word(s).
(a) 310 N (b) 470 N
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Kirchhoff's Rules: A multiloop circuit is shown in the figure. Find the current I2 if the batteries are ideal. (It is not necessary to solve the entire circuit.)
A. -3 A B. 3 A C. 7 A D. -7 A E. 0 A
A ball is dropped at time t=0.0 s. At t=2.0 s, a second ball is thrown downward with speed v. What is v if at t=4.0 s, the two balls are at the same vertical position?
A. 15 m/s B. 25 m/s C. 49 m/s D. 29 m/s
When a mass of 0.350 kg is attached to a vertical spring and lowered slowly, the spring stretches 12.0 cm. The mass is now displaced from its equilibrium position and undergoes simple harmonic oscillations. What is the period of the oscillations?
A) 0.695 s B) 0.483 s C) 0.286 s D) 0.0769 s E) 1.44 s
Diffuse reflection occurs when the size of surface irregularities is
A) small compared to the wavelength of the light used. B) large compared to the wavelength of the light used. C) either