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Explain the physical processes by which astronomers are able to estimate the temperature of a gas by observing which spectral lines are present in its spectrum and measuring the relative strength of the lines. This process is known as Balmer thermometry.
two parrel,very long straight wires separated by 10 cm are carrying 2.0 A and 4.0 A in opposite direction. where the magnetic field is Zero
A soccer player kicks a rock horizontally off a 40.0 m high cliff into a pool of water. what was the initial speed given to the rock
A firefighting crew uses a water cannon that shoots water at 29.0m at a fixed angle of 52.0 degrees above the horizontal. How far from the building should they position their cannon
A light train is travelling on a straight section of track at a constant speed of 15 rm m/s. As it approaches next station, it starts to slow down at a rate of 5 rm m/s^2 until it stops at the station.
A concave mirror has a focal length of 16 cm. The mirror forms an image located 36 cm in front of the mirror. What is the magnification of the mirror
A 10.0 g object moving to the right at 18.0 cm/s makes an elastic head-on collision with a 15.0 g object moving in the opposite direction at 27.0 cm/s
A 4.0-m-long steel wire has a cross-sectional area of 0.050cm^2. Its proportional limit has a value of 0.0016 times its Young's modulus. What is the maximum weight that the wire can support
An emf is induced in a conductin loop of wire 1.03 m long as its shape is changed from square to circular. Find the average magnitude of the induced emf if change in shape occurs in 4.15s and the local 0.131-T magnetic field is vertical to the pla..
A block of mass m = 2 kg is pushed against a spring of spring constant k = 30 N/m until the spring is compressed by x = 0.1 m. What is the maximum speed of the block
A car changes it speed from rest to 12 km/hr in 4sec .If the mass of the car is 2000 killograms what is the net force acting on the car
Current passes through a solution of sodium chloride. in 1.00 secnds, 2.68 x 10^16 Na+ ions arrive at the negative electrode, what is the current in the fluid
A cylinder rolls without slipping down an incline that makes a 57° angle with the horizontal. What is the acceleration of the cylinder
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