Physics, 23.11.2019 05:31 kimlyn58p0wyn0
Which of the following are true about the number of particles at a *thousandth* of a second after the bang?
a. there are lots of free protons, neutral hydrogen, and free electrons
b. there are lots of free protons, neutral hydrogen, but no free electrons
c. there are lots of free protons, no neutral hydrogen, and lots of free electrons
d. there are lots of free protons, no neutral hydrogen, and no free electrons
e. there are no free protons, lots of neutral hydrogen, and lots of free electrons
f. there are no free protons, lots of neutral hydrogen, and no free electrons
g. there are no free protons, no neutral hydrogen, and lots of free electrons
h. there are no free protons, no neutral hydrogen, and no free electrons
Answers: 1
Physics, 21.06.2019 18:40, Rachaeltice8810
Ten students stand in a circle and are told to make a transverse wave. what best describes the motion of the students? each student bumps the shoulder of his or her neighbor. at the exact time, all students take a step to the right. the students skip clockwise, going in a circular motion. one at a time, each student lifts his or her hands up and then down.
Answers: 1
Physics, 22.06.2019 09:00, edgarsandoval60
Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.
Answers: 3
Physics, 22.06.2019 21:40, lottie2306
Engines for propeller-driven aircraft are limited in their maximum rotational speed by the fact that the tip speed of the propeller must not approach the speed of sound in air (mach i). taking 6 ft as a typical diameter for a propeller of a light airplane and 1100 fils as the speed of sound, find the upper limit on the rpm (revolutions per minute) of the propeller shaft.
Answers: 3
Which of the following are true about the number of particles at a *thousandth* of a second after th...
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