Physics, 26.03.2020 08:25 DivineMemes420
1.
Which of the following is a true statement concerning the electrostatic force and gravitational force acting on an electron and a proton in an atom?
Fg > Fel
Fel > Fg
Fg = Fel
We would need to know which atom
2.
In a certain atom a proton and electron are separated by a distance of 4.7 x 10-13 m. Calculate the electrostatic force of attraction between this proton and electron.
4.90 x 10-16 N
5.45 x 10-26 N
1.04 x 10-3 N
6.5 x 1015 N
3.
In a certain atom a proton and electron are separated by a distance of 4.7 x 10-13 m. Calculate the gravitational force of attraction between this proton and electron.
4.18 x 10-73 N
8.42 x 10-40 N
2.16 x 10-55 N
4.59 x 10-43 N
Answers: 3
Physics, 21.06.2019 16:10
The man fires an 80 g arrow so that it is moving at 80 m/s when it hits and embeds in a 8.0 kg block resting on ice. how far will the block slide on the ice before stopping? a 7.1 n friction force opposes its motion.
Answers: 3
Physics, 21.06.2019 22:00
Aroll in a paper machine is powered by a separately excited dc machine. operating point 1 (under load): the roll typically operates at 764 rpm and must provide 301 nm of torque to oppose the load of the paper. the armature voltage is 230v for this operating point operating point 2 (no load): when the load is removed the speed of the roll increases to 900 rpm (the field characteristics are unchanged) la ea dev m (a) calculate the maximum torque (units of nm) that the motor can supply with this applied voltage (b) calculate the value of the armature resistance, ra (in ohms) (c) at operating point 1 (loaded condition), the field current, i, and the total input power (armature field), are measured to be to be 10 a and 28,600 w respectively. use this information to calculate the value of the field resistance, rf (in ohms). (d) (d) at operating point 1 (loaded condition), calculate the motor efficiency. express your answer as a percent to at least 2 significant digits. (d) if the field voltage is reduced by 1/2, calculate the new stall torque (in nm) of the motor (f). if the field voltage is reduced by 1/2, calculate the new no-load speed (in rad/sec)
Answers: 1
Physics, 22.06.2019 12:20
A2.0 μf capacitor and a 4.0 μf capacitor are connected in series across a 0.827-kv potential. the charged capacitors are then disconnected from the source and connected to each other with terminals of like sign together. find the voltage across each capacitor.
Answers: 2
1.
Which of the following is a true statement concerning the electrostatic force and gra...
Which of the following is a true statement concerning the electrostatic force and gra...
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