In alpha decay the mass number (the total number of protons and neutrons) of the parent nuclide decreases by
A. 0
B. 2
C. 4
D. 6
C. 4
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A cup of coffee is enclosed on all sides in an insulated container 1/2 cm thick in the shape of a cube 10 cm on a side. The temperature of the coffee is 95°C, and the temperature of the surroundings is 21°C. Find the rate of heat loss (in J/s) due to conduction if the thermal conductivity of the cup is 2 × 10?4 cal/s?cm?°C.
A. 62 B. 74 C. 230 D. 160 E. 12
Two objects are at rest on a frictionless surface. Object 1 has a mass that is twice that of Object 2. When a constant force is applied to Object 1, it accelerates for a time interval ?t. The force is removed from Object 1 and is then applied to Object 2. After Object 2 has been accelerated for the same time interval, which statements are true?
(i) p2 = 2p1 (ii) p2 = p1 (iii) p2 = ½ p1 (iv) KE2 = 2KE1 (v) KE2 = KE1 (vi) KE2 = ½ KE1
1.(i) and (vi) 2.(ii) and (iv) 3.(i) and (v) 4.(iii) and (v)Mercury's surface, upon casual visual observation, most resembles what other surface in our solar system?
What will be an ideal response?
As a charged particle moves freely in a circular path in the presence of a constant magnetic field applied perpendicular to the particle's velocity, the particle’s kinetic energy
1.remains constant. 2.increases. 3.decreases.