A boy kicks a football from ground level with an initial velocity of 20 m/s at an angle of 30° above the horizontal. How long does it take for the ball to rise to the highest point of its trajectory?
A) 1.0 s
B) 1.8 s
C) 2.0 s
D) 3.5 s
E) 0.5 s
A
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A 20.0 kg box slides down a 12.0 m long incline at an angle of 30.0 degrees with the horizontal. A force of 50.0 N is applied to the box in the upward direction to try to pull it up the incline. The applied force makes an angle of 10.0 degrees to the incline. If the incline has a coefficient of kinetic friction of 0.00, then the increase in the kinetic energy of the box is
A. 420 J. B. 475 J. C. 521 J. D. 585 J. E. 620 J.
An electron is trapped in an infinite square well (a box) of width Find the wavelength of photons emitted when the electron drops from the n = 5 state to the n = 1 state in this system
(c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg) A) 6.49 ?m B) 5.45 ?m C) 5.91 ?m D) 7.07 ?m
If a star system at 30 parsecs distance is found to be broadcasting intelligent radio signals, then their news is already ________ years old
Fill in the blank(s) with correct word
How are the particles in the elementary particle zoo classified in order to relate them effectively?
a. By particle size. b. By charge. c. By which force the particles participate in. d. By mass. e. By location.