A 20-m long steel wire (cross-section 1.0 cm2, Young's modulus 2.0 × 10^11 N/m2), is subjected to a load of 25 000 N. How much will the wire stretch under the load?
a. 0.25 cm
b. 2.5 cm
c. 12.5 cm
d. 25 cm
e. 1.25 cm
b
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A projectile is launched at an angle less than 30° and at speed v. Which will increase the projectile's range more, ignoring atmospheric drag?
a. doubling the launch angle b. increasing the speed of launch by 50% c. reducing the mass of the projectile d. launching on February 29th
A single thin slit forms a diffraction pattern, with the first minimum at an angle of 40.0° from central maximum. If monochromatic light of 530.0-nm wavelength is used for the illumination, what is the width of the slit?
A) 825 nm B) 791 nm C) 757 nm D) 723 nm E) 689 nm
Heavier stable nuclei tend to have
A) half as many protons as neutrons. B) the same number of neutrons and protons. C) more neutrons than protons. D) no clear trend in the relative number of neutrons and protons. E) more protons than neutrons.
All insects are harmful to their ecosystems
What will be an ideal response?