A 2-kg ball is thrown horizontally at. a speed of 10 m/s. At the same time, a 1-kg ball is dropped from the same height. Ignoring air resistance, which ball hits the ground first?
a. the 2-kg ball
b. it's a tie
c. the 1-kg ball
Ans: b. it's a tie
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A metallic surface is illuminated with light of wavelength 400 nm. If the work function for this metal is 2.40 eV, what is the maximum kinetic energy of the ejected electrons, in electron-volts?
(1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A 60.0-kg mass person wishes to push a 120-kg mass box across a level floor. The coefficient of static friction between the person's shoes and the floor is 0.700
What is the maximum coefficient of static friction between the box and the floor such that the person can push horizontally on the box and cause it to start moving? A) 0.333 B) 0.500 C) 0.350 D) 0.667 E) 0.700
Do you think it is possible that a 1.5-solar-mass red giant could harbor an advanced civilization? Explain your reasoning
What will be an ideal response?
A beam of X-rays of different frequencies is reflected at 10 degrees off a crystal of interatomic spacing 0.2 nm. Which X-ray wavelength is preferentially reflected?
a. 0.0943 nm b. 0.139 nm c. 0.0695 nm d. 1.02 × 10^?10 m e. 3.47 × 10^?11 m