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1. A 9000kg railroad car moving at 3m/s strikes a stationary (not moving) 5000kg railroad car. what is the kinetic energy of the 9000kg railroad car before the collision? What is the momentum of the 9000kg railroad car before the collision? If the two railroad cars couple and move off together after the collision, what is their velocity?
2. A star has a planet held in orbit by gravitational attraction. If the mass of the star were doubled, what effect would this have on the gravitational attraction between the star and its planet ? If the distance between the stars and planet were 3 times as great, what effect would this have on their gravitational attraction for each other?
a kereru new zealand wood pigeon travelling at 1.5 m/s due west has an elastic collision with an airbus a380 aeroplane. with what speed is the kereru travelling after the collision?
A daredevil jumps a canyon 9.6 m wide. To do so, he drives a car up a 18° incline. What minimum speed must he achieve to clear the canyon
The total mass of the decay products is less than the mass of the original 294Uus atom and what accounts for this missing mass
A patient recovering from surgery is being given fluid intravenously. The fluid has a density of 1040 kg/m3, and 9.54 10-4 m3 of it flows into the patient every five hours. Find the mass flow rate in kg/s
A monatomic ideal gas (? = 5/3) is contained within a perfectly insulated cylinder that is fitted with a movable piston. The initial pressure of the gas is 1.82 × 105 Pa. The piston is pushed so as to compress the gas, with the result that the Kelvin..
The blade of a helicopter is rotating in a horizontal circle. Obtain the ratio of the centripetal acceleration at the end of the blade to that which exists at a point located 3.0 meter from the center of the circle
A tank contains 11.6 g of chlorine gas (Cl2) at a temperature of 81 °C and an absolute pressure of 5.02 105 Pa. The mass per mole of Cl2 is 70.9 g/mol. How many grams of chlorine gas have leaked out of the tank
A vector has components x=6m and y=8m. What is its magnitude and direction
A +44 nC charge is placed on the z- axis at (0,0,5 cm). A grounded conducting plane fills the x-y plane where z=0. A) Find the surface charge charge density on the conducting plane at the origin.
A motorist drives along a stright road at a constant speed of 15.0 m/s. Just as she passes a parked motorcycle police officer starts to accelerate at 2.00 m/s2 to overtake her. Assuming the officer maintains this acceleration, the time it takes (in s..
A non-relativistic electron and a non-relativistic proton, of rest masses me and mp, have equal kinetic energies. What is the ratio of the de Broglie wavelength of the electron, le, to that of the proton, lp? Get an algebraic, rather than numerical, ..
An emf of 21.0 mV is induced in a499 turn coil when the current is changingat a rate of 14.0 A/s. What is the magnetic flux through each turn of the coil at an instant when the current is 7.00 A?
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