Projectile Motion
Which ball will produce the greatest RANGE.
Ball thrown at an angle of 20o OR 50o
Range = u2 Sin (2 x angle/ 9.8)
Ball thrown at an angle of 50o
Identify the main parts that make up the
a) Rotar
b) Stator
Rotar - windings and commutator
Stator - brushes and magnets
According to Planck, light travels as packets called A) phot_________ . The formula E = hf indicates that the energy of light is directly proportional to the B) fr__________. The formula wavelength = c/f indicates that the wavelength of light is inversely proportional to its C) fr_____________
A) photons
B) frequency
C) frequency
What information does a Russel Hertzsprung diagram provide?
As the luminosity (absolute magnitude -y axis) decreases the temperature (x axis) generally decreases.
Brighter and bigger stars are therefore present on the left-hand side.
Give the formula for ORBITAL VELOCITY given the period and distance from Planet A to the sun.
v = 2 x pi x distance / T
Work = q x V
Work = q x E x d
Which factor does not affect the work done on a charged particle.
a) gravity b) Voltage c) Displacement of the particle
a) gravity
Outline the function of the one Rotar component.
Rotar - windings and commutator
Windings - conductive wires wrapped around a magnetic core which provide a path for current to flow to create a magnetic field to spin the rotor.
Commutator - reverses the current flow within a winding when the shaft turns.
When light passes through a glass prism indicate which (colour/wavelength) bends
the most
the least
the most - blue
the least - red
Outline the role of the following scientists in developing our current understanding of the atom.
Gieger and Marsden
Rutherford
Chadwick
Gieger and Marsden - scattering experiment indicated that most of the mass of an atom is concentrated in the centre (nucleus)
Rutherford - through the gold foil experiment was able to identify positive charges in the centre of an atom.
Chadwick - used the law of conservation momentum to discover the neutron.
A wheel has a radius of 10m and covers a distance of 35m. Calculate its angle.
Angle = s/r
3.5o
Outline the use for a LEO, MEO and GEO satellite.
LEO - Monitoring Earths weather patterns
MEO - broadband internet
GEO - satellite TV and international phone calls
Outline a problem associated with transformers.
Indicate two ways this issue can be resolved.
Production of heat and eddy currents at the iron core.
- decrease distance between the coils in the core
- Laminate iron core
- Using wires made of materials with low resistance.
Give the lifetime for a muon.
What happens to a muon when it goes through a particle accelerator and moves close to the speed of light.
2.1 microseconds
A muon at the speed of light will take 50 microseconds.
The sun produces 4 x 1026 J of energy every second. At what rate is the sun losing mass due to its total energy loss.
E = mc2
E = mc2
m = (4 x 1026)/(3 x 108)2
m = 4.4 x 109 kg
A wheel has a radius of 4m and covers a distance of 23m. Calculate its angular velocity if it takes 2 minutes to cover this distance.
angle =s/r
angular velocity = angle/time
angle = 23/4 = 5o
angular velocity = 5/120 = 0.042 degrees per secondCalculate the ORBITAL VELOCITY given the period for one revolution is 20 hours and the distance from Planet A to the sun is 3 x 1012 m.
Remember to convert hours to seconds.
v = 2 x pi x distance / T
v = 2 x (3/14) x (3 x 1012) / (20 x 3600)
v =2.6 x 108 m/s
F = (magnetic constant) (I1I2 L / 2 x pi x r)
rearrange the formula to make (L) length the subject.
L = F x (2 x pi x r) / (magnetic constant x I1 x I2)
Calculate the speed of light from a 1500 MHz microwave given a chocolate bar formed 2 melted spots (wavelength) of 2 x 5cm.
c = frequency x wavelength
c = frequency x wavelength
c = 1500 000 000 x 0.1
c = 1500 000 00 m/s
A sample of the radioisotope Thorium-234 contains
8 x 1012 nuclei. The half life of Thorium-234 is 24 days.
Calculate the decay constant.
Decay constant = In (2) /t 1/2
= In (2) / 24
- 0.029 day
Calculate the kinetic energy for an object given it has a mass of 300g and a velocity of 4m/s.
KE = 1/2 mv2
KE = 0.5 (0.3)(42)KE = 2.4 J
Calculate the intial velocity for a projectile given it covers a distance of 120 m in 12 seconds.
s = ut + 1/2 at2
120 = u(12) + 1/2 (9.8)(144)
120 - 705.6 = 12 u
12 u = -585.6
u = -48.8 m/s
Calculate the force acting on two current carrying wires (each with 2A) given the length of the wires are 3m and the distance between each wire is 0.5m.
F = (magnetic constant) (I1I2 L / 2 x pi x r)
F = (magnetic constant) (I1I2 L / 2 x pi x r)
F = (4 x pi x 10-7)(2)(2) / 2 x pi x 0.5)
F = 1.6 x 10-6 N
Calculate the distance of the bright bands on a screen given a slit separation of 0.5 cm with a distance of 2m from the slit to the screen.
Bright band separation = Distance from slit to screen/
slit separation
= 2/ 0.005
= 400 m
During a single fission reaction there was a loss of mass (3.07 x 10-28 kg). Calculate the amount of energy that was released during the fission of a single plutonium-239.
E = mc2
E = (3.07 x 10-28 kg)(3 x 108)2
E = 173 MeV
Calculate the orbital period for a 1200 kg satellite that orbits Earth and has an orbital radius of 10 000 km.
T = 2π√(r³/GM)
T = 2π√(r³/GM)
T = 2π√(10 000 000 ³/(6.67 x 10-11)(5.972 x 1024)
T =