What is the proper abbreviation for ‘seconds?'
a. sec
b. There is none. It should always be spelled out.
c. secs
d. s
e. none of the above
D
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Weight and g: An piece of space debris is released from rest at an altitude that is two earth radii from the center of the earth. Compared to its weight on Earth, the weight of this debris is
A. zero. B. the same as on the surface of the earth. C. one-half of its weight on the surface of the earth. D. one-third of its weight on the surface of the earth. E. one-quarter of its weight on the surface of the earth.
An alpha particle is a nucleus of helium. It has twice the charge and four times the mass of the proton
When they were very far away from each other, but headed toward directly each other, a proton and an alpha particle each had an initial speed of 0.0030c, where c is the speed of light. What is their distance of closest approach? Hint: There are two conserved quantities. Make use of both of them. (c = 3.00 × 108 m/s, k = 1/4??0 = 8.99 × 109 N ? m2/C2, e = 1.60 × 10-19 C, mproton = 1.67 × 10-27 kg) A) 2.1 × 10-13 m B) 3.3 × 10-13 m C) 2.6 × 10-13 m D) 2.9 × 10-13 m
What potential difference is required across an 8.0-? resistor to cause a 2.0 A current through it?
What will be an ideal response?
The _______________ supposes that planets form in the rotating disks of gas and dust around young stars
Fill in the blank(s) with correct word