Normal body temperature for humans is 37C. What is this temperature in kelvins?
a. 296
b. 310
c. 393
d. 273
[Ques. 2] When charges qa, qb, and qc are placed respectively at the corners a, b, and c of a right triangle, the potential at the midpoint of the hypotenuse is 20 V. When the charge qa is removed, the potential at the midpoint becomes 15 V. When, instead, the charge qb is removed (qa and qc both in place), the potential at the midpoint becomes 12 V. What is the potential at the midpoint if only the charge qc is removed from the array of charges?
a. 8.0 V
b. 5.0 V
c. 7.0 V
d. 13 V
[Ques. 3] At what temperature is the same numerical value obtained in Celsius and Fahrenheit?
a. 40
b. 0
c. 40
d. 72
[Ques. 4] Electrons in an x-ray machine are accelerated from rest through a potential difference of 60 000 V. What is the kinetic energy of each of these electrons in eV?
a. 60 eV
b. 96 eV
c. 38 eV
d. 60 keV
e. 120 eV
[Ques. 5] A temperature change from 35C to 55C corresponds to what incremental change in F?
a. 20
b. 95
c. 36
d. 131
e. 68
[Ques. 6] An electron in a TV picture tube is accelerated through a potential difference of 10 kV before it hits the screen. What is the kinetic energy of the electron in electron volts? (1 eV = 1.6 1019 J)
a. 1.0E+4 eV
b. 1.6E18 eV
c. 1.6E11 eV
d. 6.3E+22 eV
e. 2.6E15 eV
[Ques. 7] If it is given that 635 K equals 362C, then it follows that 902 K equals
a. 629C.
b. 1 175C.
c. 514C.
d. 650C.
e. 640C.
[Ques. 8] Consider two charged spheres, one with charge +2 C and the other with 2 C. A proton (a positively charged particle) is at the point halfway between the spheres. What is not zero?
a. the potential energy of the proton
b. the work to move the proton from infinity to that point
c. the force on the proton
d. all of the three above are zero
[Ques. 9] The pressure in a constant-volume gas thermometer extrapolates to zero at what temperature?
a. 0C
b. 0 K
c. 0F
d. 0 Pa
[Ques. 10] Which of the following characteristics are held in common by both gravitational and electrostatic forces when dealing with either point masses or charges?
a. inverse square distance law applies
b. forces are conservative
c. potential energy is a function of distance of separation
d. all of the above choices are valid
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