Which of the following is not implied by this diagram?
A) There are six distinct forces known to operate in the universe, and a seventh force called the "super force" might also exist.
B) At very high temperatures, the electromagnetic and weak forces are no longer distinct but instead act as a single electroweak force.
C) At the current temperature of the universe, gravity is the weakest of the forces.
D) At the current temperature of the universe, the strong force is the strongest of the forces.
A) There are six distinct forces known to operate in the universe, and a seventh force called the "super force" might also exist.
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A calculus book weighing 20 N rests on the floor of a classroom. The reaction to the force of the floor on the book is a force of
A. 9.8 m/s2 exerted by the Earth on the book. B. 2.04 kg exerted by the floor on the book. C. 20 N exerted by the book on the Earth. D. 0 N. E. 20 N exerted by the book on the floor.
A marathon race is 26 mi and 385 yd long. Estimate how many strides would be required to run a marathon. Assume a reasonable value for the average number of feet/stride
A) 4.5 × 104 strides B) 4.5 × 103 strides C) 4.5 × 105 strides D) 4.5 × 106 strides
Parallel-Plate Capacitor: A 3.0-pFcapacitor consists of two large closely-spaced parallel plates that have surface charge densities of ±1.0 nC/mm2. If the potential across the plates is 23.0 kV with only air between them, find the surface area of each of the plates. (?0 = 8.85 × 10-12 C2/N ? m2)
A. 69 mm2 B. 0.014 mm2 C. 35 mm2 D. 0.0072 mm2
When an electron in H changes its spin from the same to the opposite direction as the proton, it:
A) emits an X-ray photon. B) absorbs a radio wave photon. C) emits a radio wave photon. D) absorbs a visible light photon. E) neither emits nor absorbs a photon.