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Going through the Motions
Current Events
I got the Power
Radioactive
"Wave Pun here"
100
Fiona drops a stone from rest vertically down a water well. She hears the splash of the stone striking the water 1.6 s after the stone leaves her hand. Estimate the distance between Fiona’s hand and the water surface.
What is 12.5-12.6 m
100
A copper wire with length L and radius r has a resistance R. What is the radius of a copper wire with length 2 L and resistance R?
What is r/(sqrt*2)
100
Carbon dioxide is a greenhouse gas because (this is energy, don't question it.)
What is its natural frequency molecular oscillation lies in the infrared region.
100
A sample contains 4g of helium and 20 g of neon. The mass number of helium is 4 and the mass number of neon is 20. What is the ratio number of atoms of neon/number of atoms of helium?
What is 1
100
An object undergoes simple harmonic motion with time period T and amplitude 0.5m. At time t =0s the displacement of the object is a maximum. What is the displacement of the object at time t=3T/4?
What is 0 m
200
An object is released above the surface of Earth. What describes the speed and acceleration before it reaches terminal speed?
What is speed increases and acceleration decreases
200
State Coulomb’s law.
What is The force between two (point) charges; is inversely proportional to the square of their separation and (directly) proportional to (the product of) their magnitudes.
200
An object undergoes simple harmonic motion with time period T and amplitude 0.5m. At time t =0s the displacement of the object is a maximum. What is the displacement of the object at time = (3T/4) t = ?
What is 0m
200
A radioactive sample of initial activity 12 Bq has a half-life of 3 days. What is the activity after 6 days?
What is 3 Bq
200
An oscillating water column (OWC) ocean-wave converter produces a power P. What is the power output of this converter if the amplitude and speed of the waves are both doubled?
What is 8p
300
Fiona drops a stone from rest vertically down a water well. She hears the splash of thestone striking the water 1.6 s after the stone leaves her hand. Estimate the speed with which the stone hits the water.
What is 15.7 ms^-1
300
Define electric field strength.
What is force per unit charge
300
Discuss one advantage and one disadvantage of using nuclear power production compared to using coal-fired power production.
What is advantage: does not produce CO2, does not contribute to global warming, fuel is likely to last longer/easier to transport. disadvantage: waste products are radioactive, nuclear weapons, catastrophic accidents, power plant more expensive
300
a particle that is acted on by both the strong nuclear force and the Coulomb force
What is a proton
300
Light of wavelength 600 nm travels from air to glass at normal incidence. The refractive index of the glass is 1.5. The speed of light in air is c. Which of the following correctly identifies the speed of the waves and their wavelength in the glass?
What is speed 2c/3 and wavelength 400 nm
400
Two identical balls are dropped from a tall building, one a few seconds after the other. Air resistance is not negligible. As the balls fall, the distance between the balls will
What is increase then remain constant
400
In a simple model of the hydrogen atom, the electron can be regarded as being in a circular orbit about the proton. The radius of the orbit is 2.0×10–10 m. Determine the magnitude of the electric force between the proton and the electron
What is 5.8x10^-9 newtons
400
The Drax coal-fired power plant has a power output of 4.0 GW. The efficiency of the plant is 40%.The energy density of the coal used is 24 MJkg–1. Estimate the minimum mass of coal that is burned each year (1 year = 3.2×107 s).
What is 1.3 x 10^10 kg
400
Explain how atomic spectra provide evidence for the quantization of energy in atoms.
What is atomic spectra have discreet line structure/only discreet frequencies/wavelengths, photon energy is related to frequency/wavelength, and protons have discreet energies.
400
A guitar string vibrates at 330Hz in its fundamental mode. Describe the formation of standing waves in a string fixed at both ends.
What is waves travel down the string and are reflected. Incident and reflected waves interfere/add/superpose to give a standing wave.
500
Which of the following is always true for an object moving in a straight line at constant speed?
What is No resultant force acts on the object
500
Discuss the motion of one electron after it begins to move.
What is electron will continue to accelerate, speed increases with acceleration, and acceleration reduces with separation. *when outside the field, no further acceleration/constant speed *any reference to accelerated charge radiating and losing (kinetic) energy
500
A small biofuel power station burns ethanol with an overall efficiency of 25%. The energy density of ethanol is 30MJkg–1. The mass of fuel consumed every second is 50kg. Which of the following gives the useful power output in MW?
What is 30x50x25/100
500
Sodium-22 has a decay constant of 0.27 yr–1. Calculate, in years, the half-life of sodium-22.
What is 2.6 years
500
A distant galaxy emits radio waves of frequency 6.0×109 Hz and is moving with speed 6.0×10^6 ms^–1 directly away from an observer on Earth. Determine the wavelength of the radio wave as measured by the observer on Earth.
What is 5.1x10^-2 m