There is no evidence for plate tectonics on the Moon today
Indicate whether the statement is true or false
TRUE
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Matter Waves: If the de Broglie wavelength of an electron is 380 nm, what is the speed of this electron? (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s)
A. 2.0 km/s B. 3.8 km/s C. 1.9 km/s D. 4.1 km/s E. 5.2 km/s
Two parallel wires are separated by 0.36 m. Wire A carries 4.8 A and Wire B carries 8.9 A, both currents in the same direction. The force on 0.53 m of Wire A is:
a. 1.3E–5 N. b. 4.5E–5 N. c. 2.6E–6 N. d. 1.4E–6 N. e. 4.0E–5 N.
A 2.3-kg object traveling at 6.1 m/s collides head-on with a 3.5-kg object traveling in the opposite direction at 4.8 m/s. If the collision is perfectly elastic, what is the final speed of the 2.3-kg object?
A) 0.48 m/s B) 7.1 m/s C) 3.8 m/s D) 4.3 m/s E) 6.6 m/s
How can we easily understand the image that results from a pinhole camera like the one shown here?
a. The size and orientation of the image can be determined by examining the relative sizes of the sides of similar triangles that result from drawing light rays from parts of the object, through the pinhole and onto the rear of the camera. b. Maxwell's equations describing the behavior of light need to be applied. c. We need to use the "lens equation" that calculates where a camera lens forms images. d. The pinhole camera takes a picture of a pinhole-sized piece of an object. e. The pinhole eliminates the colored light rays, thus creating a black-and-white picture.