A concave mirror with a radius of curvature of 1.0 m is illuminated by a candle located on the symmetry axis 3.0 m from the mirror. Where is the image of the candle?
60 cm in front of the mirror
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Which contains more moles of material: 80 grams of helium gas (He, having atomic weight 4.0 g/mol) or 400 grams of argon gas (Ar, having atomic weight 40 g/mol)?
A) helium B) argon C) Both contain the same number of moles.
Why doesn't Mars have a stratosphere?
A) It is too far from the Sun. B) Its atmosphere does not contain enough of an ultraviolet-absorbing gas. C) Its atmosphere does not contain enough greenhouse gases. D) It is too small in size. E) It lacks a strong enough magnetic field.
The ________ are two layers of charged particles trapped by our magnetic fields
Fill in the blank(s) with correct word
A 1.6-kg block is attached to the end of a 2.0-m string to form a pendulum. The pendulum is released from rest when the string is horizontal. At the lowest point of its swing when it is moving horizontally, the block is hit by a 10-g bullet moving horizontally in the opposite direction. The bullet remains in the block and causes the block to come to rest at the low point of its swing. What was
the magnitude of the bullet's velocity just before hitting the block? a. 1.0 km/s b. 1.6 km/s c. 1.2 km/s d. 1.4 km/s e. 1.8 km/s