Physics Notebook
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The Physics Notebook provides solutions to select problems and exercises from Physics.
The purpose of this channel is to build problem-solving skills that are critical to understanding and applying the principles of Physics.
The text of Physics Notebook is available in multiple formats.
Notebook Exercises
At the end of each exercise you will be able to check the answer and the commented resolution of this one. If you prefer, download and have your list in .doc or .pdf format:
Further Applications of Newton's Laws
01
A block of mass m slides down on an inclined plane of slope of angle θ. If there is no friction between the block and the plane, which of the following statements about the movement of block must be true?
a) The downward acceleration of block is a = m.sin θ;
b) The downward acceleration does not depend on the mass of the block;
c) The lower the mass, the longer the time it takes for the block to come down the ramp;
d) For an angle of 30º, so the acceleration is a = 2.0 m/s2;
e) The time it take for the block to come down the ramp increase as the angle of inclination, θ, is increase.
Solving Problem
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Uniform Circular Motion and Gravitation
02
If the time it takes a planet to move from position A to B, sweeping out area A1, is exactly the time taken to move from position C to D, sweeping area A2, then
a) The area between A, B and the Sun is the largest.
b) The area between C, D and the Sun is the largest.
c) Both areas are equal in size.
d) There is not enough information to determine the areas.
Statics and Torque
04
A block of mass M is lifted at constant velocity, via an arrangement of pulleys as shown. Determine the pulling force F. Ignore the mass of the pulleys.
Fluid Statics
05
How does pressure affect a straw? Read the following sentences and select the incorrect alternative.
a) When a person sucks on the end of their straw, they reduce the atmospheric pressure in the straw.
b) The balance in pressures causes the water to be pushed upwards towards the persons mouth.
c) Atmospheric pressure pushes the liquid through the straw and up into your mouth.
Temperature, Kinetic Theory and the Gas Laws
06
In 2020, one of the Brazil’s worst droughts of recent decades has seen the River Paraguay –one of its main waterways – drop to 50-year lows. Meanwhile, the country was through a heatwave, registering a record high temperature of 45 °C. What is the value in Fahrenheit Scale? What is the value in Kelvin Scale?
Geometric Optics
07
A ray of light passes from air, with refractive index 1.0, into glass, at an angle of incidence of 60˚. What is the angle of refraction if the index of refraction of the glass is 2.0?
a) 21° (sin 21°= √2/4)
b) 26° (sin 26°= √3/4)
c) 30° (sin 30°= 1/2)
d) 45° (sin 45°= √2/4)
e) 60° (sin 60°= √3/2)
Oscillatory Motion and Waves
08
A wave is traveling in a rope. The diagram represents a snapshot of the rope at a particular instant in time. If the period of vibration of the rope is 0.4 s, determine the amplitude, frequency, wavelength and speed of this wave.
Electric Potential and Electric Field
09
Two large metallic plates of the same size are connected each to the terminals of a battery. The distance between the plates is uniform and equal to 3 m. What is the intensity of the electric field between the plates if the potential difference between the terminals of the battery is equal to 15 volts? If the electric potential at a point A is 5 V, what are the electric potentials at points B and C?
Electric Current, Resistance, and Ohm's Law
10
A kilowatt-hour (kWh) is the energy that a one thousand watts, one kilowatt, appliance uses in one hour. Thus, How much energy, in kWh, is used if you use a 6000 W electric shower during half an hour?
Magnetism
11
What is the force experienced by a charge of 20 mC moving at 100 m/s perpendicularly through a magnetic field of magnitude 3T?
Introduction to Quantum Physics
12
In an experiment on the photoelectric effect, the work function of a metal is 2.0 eV.
a) Determine the maximum kinetic energy of the photoelectrons in units of eV, when photons of red light of energy 1.9 eV hit metal surface.
b) If the frequency of the light is increased, photons of blue light of energy 2.3 eV hit metal surface, what is the maximum kinetic energy of the photoelectrons in units of eV?
c) If the frequency of the light is increased, photons of violet light of energy 3.1 eV hit metal surface, what is the maximum kinetic energy of the photoelectrons in units of eV?
Radioactivity and Nuclear Physics
13
Sequence the modes of nuclear decay, by writing the numbers 1 to 4 in the squares to the left of the Nuclear Decay.
Playlist
Watch all the videos in this notebook, in sequence, for your content review.
Solutions
01. B.
02. C.
03. C.
04. 5 kgf.
05. B.
06. 113 °F and 318 K.
07. B.
08. 7.5 cm, 2.5 Hz, 28 cm and 70 cm/s.
09. a) 5 V/m; b) VB = 5 V e VC = -5 V.
10. a) 3 kWh.
11. 6 N.
12. a) Red light of energy 1.9 eV does not eject photoelectrons; b) 0.3 eV; c) 1.1 eV.
13. 4, 2, 1 and 3.