You throw a rock horizontally off a cliff with a speed of 20 m/s and no significant air resistance. After , the magnitude of the velocity of the rock is closest to
A) 28 m/s.
B) 20 m/s.
C) 40 m/s.
D) 37 m/s.
A
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Raindrops are falling straight downward. When observed from a car traveling at 55.0 mi/h, the drops streak the side window at an angle of 60.0° with the vertical. Find the speed with which the drops are falling.
What will be an ideal response?
If the wavelength of light in Young's two-slit experiment is decreased, which one of the following statements is true of the interference pattern?
A) The distance between the minima stays the same. B) The distance between the maxima decreases. C) The distance between maxima stays the same. D) The distance between the maxima increases. E) Impossible to tell without knowing the separation between the slits.
Earth is nearly twice as large as Venus
Indicate whether the statement is true or false
A charge of +3.0 mC is distributed uniformly along the circumference of a circle with a radius of 20 cm. How much external energy is required to bring a charge of 25mC from infinity to the center of the circle?
a. 5.4 J b. 3.4 J c. 4.3 J d. 2.7 J e. 6.8 J