Iron is a poor choice of nuclear fuel because it releases
A) energy only when fused.
B) energy only when fissioned.
C) no energy when fused or fissioned.
Answer: C
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Which of the following is NOT a reason to use a reflecting telescope rather than a refractor?
A) Heavy lenses, which can only be supported at their edges, tend to deform under their own weight. B) Lenses are harder to focus than mirrors. C) Lenses are subject to chromatic aberration. D) A lens must have two precision surfaces; a mirror needs only one. E) Lenses absorb light, while mirrors do not.
A hockey puck slides off the edge of a horizontal platform with an initial velocity of 28.0 m/shorizontally in a city where the free-fall acceleration is 9.81 m/s2. The height of the platform above the ground is 2.00 m
What is the angle below the horizontal of the velocity of the puck just before it hits the ground if you ignore the effects of air? A) 77.2° B) 72.6° C) 12.8° D) 12.6° E) 31.8°
When a 125-kg piece of equipment is hung from a steel wire of diameter 6.00 mm, it stretches the wire by 4.00 mm. If instead the wire had a diameter of 3.00 mm, but all else were the same, by what distance would the same equipment stretch the wire?
A) 1.00 mm B) 2.00 mm C) 16.0 mm D) 8.00 mm E) 4.00 mm
Electron A is fired horizontally with speed 1.00 Mm/s into a region where a vertical magnetic field exists. Electron B is fired along the same path with speed 2.00 Mm/s. Which electron has a larger magnetic force exerted on it?
1.A does. 2.B does. 3.The forces have the same nonzero magnitude. 4.The forces are both zero.