Answer the following statement(s) true (T) or false (F)
1. A particle’s Newtonian x-momentum 
is always either equal to or smaller than the x component of the particle’s four-momentum px
2. A particle’s mass is always either equal to or smaller than the time-component of its four-momentum
3. The absolute value of the x component of a particle’s four-momentum vector is always either equal to or smaller than its t component
4. The squared magnitude of a four-vector could be negative.
5. The squared magnitude of a particle’s four-momentum could be negative.
1. TRUE
2. TRUE
3. TRUE
4. TRUE
5. FALSE
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Thermodynamic Devices: A Carnot air conditioner has a coefficient of performance of 17.0 and removes 72.0 MJ of heat from the interior of a house every hour. How much power does it consume?
A. 1180 W B. 1320 W C. 520 kW D. 3.14 MW E. 1.25 MW
A machinist needs to remove a tight fitting pin of material A from a hole in a block made of material B. The machinist heats both the pin and and the block to the same high temperature and removes the pin easily
What statement relates the coefficient of thermal expansion of material A to that of material B? A) Material B has a greater coefficient of expansion than does material A. B) The situation is not possible, heating block B will shrink the hole in the material as the material expands with increasing temperature. C) Material B has the same coefficient of expansion as does material A. D) Material B has a negative coefficient of expansion and A has a positive coefficient of expansion. E) Material A has a greater coefficient of expansion than does material B.
Classify the following statement as a characteristic
(a) of electric forces only, (b) of magnetic forces only, (c) of both electric and magnetic forces, or (d) of neither electric nor magnetic forces. The magnitude of the force depends on the charged object’s direction of motion.
1.electric forces 2.magnetic forces 3.both electric and magnetic forces 4.neither electric nor magnetic forcesA projectile is launched from ground level at an angle of 50.0° above horizontal with a speed of 30.0 m/s. If the projectile is moving over level ground, how long is it in the air before it again contacts the ground?
A) 8.12 s B) 2.35 s C) 4.69 s D) 6.44 s E) 11.3 s