Ellen places an object 48.4 cm from a concave lens. If a virtual image appears 24.6 cm from the lens on the same side as the object, what is the focal length of the lens?
a. –16.3 cm
b. –50.0 cm
c. 732 cm
d. –23.8 cm
e. –36.5 cm
b
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Observed mall fluctuations in the temperature of the cosmic microwave background are predicted by dark energy models
Indicate whether the statement is true or false
A disk (radius = 8.0 cm) that rotates about a fixed axis starts from rest and accelerates at a constant rate to an angular velocity of 4.0 rad/s in 2.0 s. What is the magnitude of the total linear acceleration of a point on the rim of the disk at the instant when the angular velocity of the disk is 1.5 rad/s?
A. 24 cm/s2 B. 16 cm/s2 C. 18 cm/s2 D. 34 cm/s2 E. 44 cm/s2
What any type of field generation cannot create is
A) light. B) electromagnetic waves. C) energy.
Two pistons push down on the fluid filling two cylinders connected by a narrow hose, as shown in the figure. The area A1 is 1 square inch, and the area A2 is 10 square inches. A force of 4 pounds is exerted downward on piston 1, as shown
 The force F2 needed to keep piston 2 in place is __________.