An object is in uniform circular motion. Which of the following statements is true?
A. Velocity = constant
B. Speed = constant
C. Acceleration = constant
B. Speed = constant. The ‘uniform’ in the term ‘uniform circular motion’ refers to the speed.
Since it is changing direction, the velocity is changing, so although speed is constant, velocity is not.
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According to the law of reflection of light, the angle of incidence is
A) equal to the angle of reflection. B) smaller than the angle of reflection. C) greater than the angle of reflection.
Several resistors are connected in parallel. Which of the following statements are correct? Choose all that are correct
1.The equivalent resistance is greater than any of the resistances in the group. 2.The equivalent resistance is less than any of the resistances in the group. 3.The equivalent resistance depends on the voltage applied across the group. 4.The equivalent resistance is equal to the sum of the resistances in the group. 5.None of those statements is correct.
The mirrors for X-ray telescopes are the same shape as those of optical reflectors
Indicate whether the statement is true or false
What is the binding energy of 12C? The mass of an atom of 12C is 12 u (exactly), of an atom of 1H is 1.007825 u, and of a neutron is 1.0086649 u.
A. 137 MeV B. 104 MeV C. 92.2 MeV D. 46.1 MeV E. 7.68 MeV