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Trying to get his car out of mud, a man ties one
end of a rope around the front bumper and the other end tightly
around a utility pole 18 m away. He then pushes sideways on the
rope at its midpoint with a force of 550 N, displacing the center of
the rope 0.30 m, but the car barely moves.What is the magnitude of
the force on the car from the rope? (The rope stretches somewhat.)
A jet flies 700km due north,then 300km due west,after which it moves 400km due north and 800 km due east.
Using vector notation,draw the movement
If the energy of electron in second excited state is 9eV in an infinite potential box . The ground state energy of the particle is:
A steel ball A collides elastically with another steel ball and ball B is observed to move off at an angle theta with the initial direction of motion of A. The mass of B is five time that of A. Determine the direction in which A moves after collision and the speed of two balls
Given the dimensions of the reduced eye , the
diameter fovea ab = 0.3mm. view distance nB= nA=2.05
meters, na = nb = 1.5cm, calculate the object size for an image
filling the fovea.Pay attention to unit 1m=100cm=1000mm;
The focal point of a hyperopic eye is [Best
answer]
(A) on the retina.
(B) behind the retina.
(C) on the fovea.
(D) in front of the retina.
The pressure of the helium in the balloon is 100 000 Pa. The volume of the balloon is 0.030 m3 . The balloon is compressed at a constant temperature causing the volume to decrease to 0.025 m3 . No helium leaves the balloon. Calculate the new pressure in the balloon
The temperature of the helium in the balloon was increased. The mass and volume of helium in the balloon remained constant. Explain why the pressure exerted by the helium inside the balloon would increase
. A bicycle tyre has a volume of 1.2 x 10-3 m3 when fully inflated. The barrel of the pump
has a working volume of 9 x 10-5 m3. Assume that the inflation takes place slowly and
no heating occurs.
How many strokes of the pump are required to inflate the tyre from being completely
flat (no air inside) to its fully inflated pressure (3.0 x 105 Pa) and volume?
Why will the bicycle pump get hot if you’re pumping quickly?
Neon is a monatomic gas, in which inter-molecular forces are extremely weak. 1.00 kg
of neon gas has a density of 0.828 kgm-3 at 100 kPa and 293 K. Find the :
(a) average kinetic energy of each gas molecule
(b) total kinetic energy of the gas.
(c) Root-mean-square speed (crms)
If the neon gas is compressed to double its density, while keeping the temperature the
same:
(d) What are the values for (a)-(c) at the new pressure and volume?
