A projectile is launched with an initial velocity of 80 m/s at 30° above the horizontal. Neglecting air resistance, what is horizontal component of the projectile's acceleration?
A) 40 m/s2 B) 0 m/s2 C) 69 m/s2 D) 9.8 m/s2 E) 80 m/s2
B
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There is an upper limit on the speed of a particle, which means there is also an upper limit on its
A) momentum. B) kinetic energy. C) both of these D) neither of these
Which of the following is a reason why low-mass stars cannot get very hot when they contract?
A) They are unable to convert gravitational energy into thermal energy. B) They have limited gravitational energy. C) They get very hot and hence can ignite several nuclear fuels. D) They can sustain hydrogen fusion only if their masses are less than 0.08 solar mass.
Equation of Traveling Waves: Four waves are described by the following equations, where distances are measured in meters and times in seconds.I. y = 0.12 cos(3x - 21t)II. y = 0.15 sin(6x + 42t)III. y = 0.13 cos(6x + 21t)IV. y = -0.23 sin(3x - 42t)Which of these waves have the same period?
A. I and III, and also II and IV B. I and IV, and also II and III C. I and II, and also III and IV D. All of them have the same period. E. They all have different periods.
Which of the following types of electromagnetic radiation has the greatest energy?
a. X-rays b. visible light c. radio d. gamma rays e. infrared radiation