Express (4.3 × 106 )-1/2 in scientific notation
A) 2.1 × 103 B) 4.8 × 10-4 C) 2.1 × 104 D) 2.1 × 10-5
B
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Why did the solar nebula heat up as it collapsed?
A) Nuclear fusion occurring in the core of the forming Sun produced energy that heated the nebula. B) As it shrank in size, gravitational potential energy was converted to thermal energy. C) It was heated by radiation from nearby stars. D) The shock wave from a nearby supernova heated the gas. E) Collisions among planetesimals generated friction and heat.
According to a postulate of Einstein, which of the following describes the nature of the laws of physics as one observes processes taking place in various inertial frames of reference?
a. Laws are same only in inertial frames with zero velocity. b. Laws are same only in inertial frames moving at low velocities. c. Laws are same only in inertial frames moving at near speed of light. d. Laws are same in all inertial frames.
Two blocks, having the same mass but different sizes, slide with the same constant speed on a smooth surface, then move onto a surface having friction coefficient ?k
A proton is released from rest at the origin in a uniform electric field in the positive x direction with magnitude 850 N/C. What is the change in the electric potential energy of the proton–field system when the proton travels to x = 2.50 m?
1.3.40 × 10^-16 J 2.-3.40 × 10^-16 J 3.2.50 × 10^-16 J 4.-2.50 × 10^-16 J 5.-1.60 × 10^-19 J