A particle physicist observes cosmic rays creating a new particle high in the atmosphere, and the speed of this particle is measured at 99.7% the speed of light
It is unstable, and is observed to decay in an average 37.0 ?s. If this particle were at rest in the laboratory, what would be its average lifetime?
A) 2.9 µs
B) 18 µs
C) 5.3 µs
D) 12 µs
E) 4.3 µs
A
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A charged particle moving in the magnetic field created by an external magnet experiences a force that is perpendicular to both the particle’s velocity 
and the direction of the magnetic field 
in the sense indicated by your right thumb if your right index finger points in the direction of and your adjacent finger points in
the direction of . (The magnetic field , in turn, points away from the external magnet’s north pole and toward its south pole.) A certain radioactive substance emits quantons that, when placed in a magnetic field directed away from the observer, bend to the right side of their direction of travel. These nuclei are decaying via which kind of process?
A. An alpha decay process
B. A beta decay process
C. A gamma decay process
D. There is not enough information to specify.
An aluminum wire and a steel wire, each of length 2.0 m, are hung from the ceiling. A 5.0-kg mass is suspended from the lower end of each wire. The aluminum wire has a diameter of 2.2 mm
What must be the diameter of the steel wire if it is to stretch the same distance as the aluminum wire, so that the two wires maintain equal lengths after the masses are attached? Young's modulus for aluminum is 0.70 × 1011 Pa and for steel it is 2.0 × 1011 Pa.
Why do we use fuses?
a. to eliminate shock hazards b. to prevent fires c. to save on the cost of electricity d. to store charge
A large 2.54-cm.-thick copper plate is placed between two air streams. The heat transfer coefficient on the one side is 28 W/(m2 K) and on the other side is 57 W/(m2 K). If the temperature of both streams is suddenly changed from 38°C to 93°C, determine how long it will take for the copper plate to reach a temperature of 82°C.
GIVEN
• A large copper plate between two air streams whose temperatures suddenly change
• Plate thickness (2L) = 2.54 cm = 0.0254 m
• The heat transfer coefficients are
? lch = 28 W/(m2 K)
? 2ch = 57 W/(m2 K)
• Air temperature changes from 38°C to 93°C
FIND
• How long it will take for the copper plate to reach a temperature of 82°C
ASSUMPTIONS
• The initial temperature of the plate is 38°C
• The plate can be treated as an infinite slab
SKETCH
