A constant horizontal pull acts on a sled on a horizontal frictionless ice pond. The sled starts from rest. When the pull acts over a distance x, the sled acquires a speed v and a kinetic energy K
If the same pull instead acts over twice this distance: A) The sled's speed will be 2v and its kinetic energy will be 2K.
B) The sled's speed will be 2v and its kinetic energy will be K .
C) The sled's speed will be v and its kinetic energy will be 2K.
D) The sled's speed will be v and its kinetic energy will be K .
E) The sled's speed will be 4v and its kinetic energy will be 2K.
C
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Faraday's law describes
A) electromagnetic induction. B) the connection between current, voltage, and resistance. C) the attraction and repulsion of magnetic poles. D) the force between magnetic poles. E) all of the above
When sulfur-35 (Z = 16) decays to chlorine-35 (Z = 17), an alpha particle is emitted
Indicate whether the statement is true or false
Circular Motion of Charges: Alpha particles, each having a charge of +2e and a mass of 6.64 ×10-27 kg, are accelerated in a uniform 0.50 T magnetic field to a final orbit radius of 0.50 m. The field is perpendicular to the velocity of the particles. What is the kinetic energy of an alpha particle in the final orbit? (1 eV = 1.60 × 10-19 J, e = 1.60 × 10-19 C)
A. 3.0 MeV B. 2.6 MeV C. 3.4 MeV D. 3.9 MeV E. 4.3 MeV
You and your friend want to go to the top of the Eiffel Tower. Your friend takes the elevator straight up. You decide to walk up the spiral stairway, taking longer to do so
Compare the gravitational potential energy (U) of you and your friend, after you both reach the top. A) It is impossible to tell, since the times are unknown. B) It is impossible to tell, since the distances are unknown. C) Your friend's U is greater than your U, because she got to the top faster. D) Both of you have the same amount of potential energy. E) Your U is greater than your friend's U, because you traveled a greater distance in getting to the top.