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An object is suspended on a spring balance in a ship sailing
along the equator with a speed v. Show that the scale reading
will be very close to where is the angular
speed of the Earth and W0 is the scale reading when the ship
is at rest. Explain the plus or minus.
In an engine cylinder a gas has a volumetric analysis of 13%CO2, 12.5%O2 and 74.5% N2. The temperature at the beginning of expansion is 9500C and gas mixture expands reversibly through a volume ratio of 8:1. According to the law pV1.2=constant. Find per kg of gas, the work done and the heat flow. Take Cp for CO2=1.235kJ/kg K and O2=1.088kJ/kg K and N2 is 1.172kJ/kg K.
- A bullet leaves the barrel of a gun at a speed of 220 m/s at an angle of 10 degrees above the horizontal. At the moment the bullet leaves the barrel, the acceleration of the bullet is:
- 0
- 220 m/s2 to the right
- 9.8 m/s2 upward
- 9.8 m/s2 downward
a cat, meerkat and rat are fighting over a bat. the cat is pulling with a force of 25N (south), the rat is pulling with a force of 12N (North 20 degrees east) and meerkat is pulling with a force of 18N (N30 degrees west) what is the net force and acceleration acting on the 2.2kg bat
An ox is being made to drag a box of socks. there is 920N of friction between the box and the floor, the box has a mass of 350kg. the ox is pulling with a force of 1200N right. draw a free body diagram showing the forces relevant to the motion of the box and calculate the acceleration.
A log is being pushed across a bog by a dip at a constant speed. using a free body diagram and sentences explain what the value of the net force is acting on the log and why it is that value. show all forces acting on the object.
A cyclist overcomes a resistive force or 30 N in order to cycle 30 m. It takes her 6 seconds to cycle this distance. Calculate the power of the cyclist
3. A 300 m long train passed through a 500 m long tunnel. Both lengths are measured at rest. The train speeds at 4/5c from west to east through the tunnel.
In the train's reference frame:
i. What would be the length of the tunnel?
There are two passengers on the train, Ahmad who sits at the very front of train and Siti, who sits at the very rear. At the instant that the train enters the tunnel completely, Ahmad and Siti both stick out their heads up. Siti should be able to see the west end of the tunnel and Ahmad should be able see the east end of the tunnel.
ii. Will they see the ends of the tunnel simultaneously? Explain and sketch the situation.
In the tunnel's reference frame:
iii.At the instant that the train enters the tunnel completely, Ahmad and Siti stick out their heads up, will they simultaneously see the ends of the tunnel?
iv.Explain If the answer in (iii) is no, who will see the end of tunnel first? Sketch the situation.
Particulate nature of light: Describe one experiment or observation that shows that light has wave properties and one experiment or observation that shows that it behaves as a stream of particles. Ensure that you explain precisely how each experiment leads to that conclusion.
Green light of wavelength 550 nm is shone on potassium, which
has a work function of 2.0 eV. Calculate the maximum kinetic energy of the photoelectrons emitted.
