The _____ is the average density of the Universe needed to make its curvature flat
A) relative density
B) arithmetic density
C) nuclear density
D) critical density
D
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At what speed would a proton need to circle the Earth at a height of 1000 km above the equator if the Earth's magnetic field is horizontal and directed north-south, with an intensity of 4.00 × 10?8 T? (The radius of the Earth is 6400 km and the charge and mass of the proton are q = 1.60 × 10?19 C and mp = 1.67 × 10?27 kg. Ignore relativistic corrections.)
What will be an ideal response?
When you look at a single slit diffraction pattern produced on a screen by light of a single wavelength, you see a bright central maximum and a number of maxima on either side, their intensity decreasing with distance from the central maximum. If the width of the slit is decreased,
a. the pattern shrinks in size. (central maximum less wide; other maxima in closer to it) b. the pattern increases in size. (central maximum wider; other maxima farther from it) c. it does not affect the size of the pattern. d. the width of the central maximum increases, but the other maxima do not change in position or width. e. the width of the central maximum decreases, but the other maxima do not change in position or width.
A telescope with an 8-inch mirror will collect twice as much light as one with a 4-inch mirror
Indicate whether the statement is true or false
A 600-kg car is going around a banked curve with a radius of 110 m at a speed of 24.5 m/s. What is the appropriate banking angle so that the car stays on its path without the assistance of friction?
A) 60.9° B) 29.1° C) 33.8° D) 56.2° E) 13.5°