Two blocks, having the same mass but different sizes, slide with the same constant speed on a smooth surface, then move onto a surface having friction coefficient ?k
3
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An isolated black hole in empty intergalactic space would be difficult to detect because
a. there would be no stars behind it whose light would be affected by gravitational lensing. b. it could not emit light from inside its event horizon. c. no companion stars would be affected by its gravitational field. d. no matter would be falling into it to create an X-ray-emitting accretion disk. e. All of the other choices are correct.
A force does work on an object if a component of the force
a. is perpendicular to the displacement of the object. b. is parallel to the displacement of the object. c. perpendicular to the displacement of the object moves the object along a path that returns the object to its starting position. d. parallel to the displacement of the object moves the object along a path that returns the object to its starting position.
A long solenoid (n = 80 turns/cm) carries a current of 70 mA. Determine the magnitude of the magnetic field inside the solenoid
An electron has the same de Broglie wavelength as a 390 nm photon. The speed of the electron is closest to:
A) 1,900 m/s B) 2,100 m/s C) 1,700m/s D) 1,500 m/s E) 540 m/s