An object is placed 15. cm from a concave mirror of focal length 20. cm. If the object is 4.0 cm tall,
(a) where is the image formed?
(b) how tall is it?
(a) 60. cm behind the mirror
(b) 16. cm tall
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A set of charged spheres carries -1.5 mC and each has mass 15 ?g. What vertical electric field in the laboratory would cause these spheres to continue in a straight line if they were projected horizontally into the electric-field region?
A. -98 ?V/m B. 10 mV/m C. -10 mV/m D. 98 ?V/m
A 100 kg football linebacker moving at 2 m/s tackles head-on an 80 kg halfback running 3 m/s. Neglecting the effects due to digging in of cleats
A) this is a simple example of an elastic collision. B) the linebacker will drive the halfback backward. C) neither player will drive the other backward. D) the halfback will drive the linebacker backward.
In design, most radio telescopes, like Arecibo, are ________
Fill in the blank(s) with correct word
A piece of copper of mass 110 g is being drilled through with a 1/2" electric drill. The drill operates at 25.0 W and takes 25.0 s to bore through the copper. If all the energy from the drill heats the copper, find the copper's increase in temperature. ccopper = 387 J/kg/°C
a. 18.4 C° b. 23.5 C° c. 14.7 C° d. 22.0 C° e. 29.4 C°