An object is placed 25 cm in front of a lens of focal length 20 cm. 60 cm past the first lens is a second lens of focal length 25 cm. How far past the 25-cm lens does the final image form?
a. 20 cm
b. 40 cm
c. 16 cm
d. 25 cm
e. 47 cm
c
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The main difference between sand dunes and ripple marks is
A) ripple marks are only caused by water. B) ripple marks are larger than sand dunes. C) sand dunes are larger than ripple marks. D) ripple marks are stationary.
How do we know the Sun is in hydrostatic equilibrium?
A. It is not growing colder. B. It is not exploding. C. It is not collapsing. D. All of these choices are correct. E. None of these choices are correct.
A 2.0-kg projectile moves from its initial position to a point that is displaced 20 m horizontally and 15 m above its initial position. How much work is done by the gravitational force on the projectile?
a. +0.29 kJ b. ?0.29 kJ c. +30 J d. ?30 J e. ?50 J
A steam turbine is an example of a heat mover
Indicate whether the statement is true or false