Very small forces can have tremendous effects on the motion of very small objects. This is particularly apparent at the scale of the atom. An electron, mass 9.1 × 10 -31 kg, experiences a force of 1.6 × 10 -17 N in a typical electric field at the earth’s surface. From rest, how much time would it take for the electron to reach a speed of 3.0 × 10 6 m/s, 1% of the speed of light ?
Very small forces can have tremendous effects on the motion of very small objects. This is particularly apparent at the scale of the atom. An electron, mass 9.1 × 10 -31 kg, experiences a force of 1.6 × 10 -17 N in a typical electric field at the earth’s surface. From rest, how much time would it take for the electron to reach a speed of 3.0 × 10 6 m/s, 1% of the speed of light ?
Very small forces can have tremendous effects on the motion of very small objects. This is particularly apparent at the scale of the atom. An electron, mass 9.1 × 10-31kg, experiences a force of 1.6 × 10-17N in a typical electric field at the earth’s surface. From rest, how much time would it take for the electron to reach a speed of 3.0 × 106m/s, 1% of the speed of light?
Definition Definition Rate at which light travels, measured in a vacuum. The speed of light is a universal physical constant used in many areas of physics, most commonly denoted by the letter c . The value of the speed of light c = 299,792,458 m/s, but for most of the calculations, the value of the speed of light is approximated as c = 3 x 10 8 m/s.
An electron is a subatomic particle (m = 9.11 x 10-31 kg) that is subject to electric forces. An electron moving in the +x direction accelerates from an initial velocity of +5.81 x 105 m/s to a final velocity of 2.69 x 106 m/s while traveling a distance of 0.0663 m. The electron's acceleration is due to two electric forces parallel to the x axis: F1−→F1→ = 9.79 x 10-17 N, and F2−→F2→, which points in the -x direction. Find the magnitudes of (a) the net force acting on the electron and (b) the electric force F2−→ .
The nucleus of 8 Be, which consists of 4 protons and 4 neutrons, is very unstable and spontaneously breaks into two alpha particles (helium nuclei, each consisting of 2 protons and 2 neutrons). (a) What is the force between the two alpha particles when they are 5.00 × 10−15 m apart, and (b) what is the initial magnitude of the acceleration of the alpha particles due to this force? Note that the mass of an alpha particle is 4.002 6 u.
The two long, straight wires that run along the back of a computer case to power the cooling fan carry 0.110 A in opposite directions. The wires are separated by 5.00 mm. (
a) Find the force per unit length (magnitude and direction) that these wires exert on each other.
(b) The mass per unit length of the wire is 5.00 x 10-3 kg/m. What acceleration does one of the wires experience due to this force?
Chapter 4 Solutions
College Physics: A Strategic Approach Technology Update, Books a la Carte Edition & Modified Mastering Physics with Pearson eText -- ValuePack Access . Chapters 1-16 and 17-30 (3rd Edition)
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