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Q1. An important news announcement is trans- mitted by radio waves to people who are 122 km away, sitting next to their radios, and by sound waves to people sitting across the newsroom, 1.2 m from the newscaster. Take the speed of sound in air to be 345 m/s.
What is the difference in time that the message is received?
Response in units of ms
Q2. Two charges placed the magnitude fql is 3.00uc, but its sign and the of the charge q2 are not known. The direct of the net electric field E at point P is totally in the negative y-direction. (a) Considering the different possible signs of q1 and q2 there are four possible diagrams that could represent the electric field E1 and E2 produced by q1 and q2. Sketch the four possible electric field configurations. (b) Using the sketches from part (a) and the direction E, deduce the signs if q1 and q2. (c) Find out the magnitude of E.
A car takes 16 s to go from v = 0 to v = 50 m/s at approximately constant acceleration. If you wish to find the distance travelled using the equation d = 1/2 at2, what value should you use for a.
What is the pressure inside the thermos
Then find the force between them as a function of distance h. describe why the sign of the force does (or does not) make sense to you.
How numerous revolutionsthe wheel have made through the time
A spring stiffness 900 N/m and relaxed length 1m stands vertically on a table. You hold a block of mass 1 kg barely touching the top of the spring. Assume you let the mass down onto the spring certain distance very slowly and view the mass is not mov..
A steel wire of length 1.97 with circular cross section must stretch no more than 0.260 when a tensile (stretching) force of 400 is applied to each end of the wire. What is the minimum diameter necessary.
A battery having an emf of 11.10 V delivers 102 mA when connected to a 61.0 load. Find out the internal resistance of the battery.
The lens has a refractive index of 1.30. Find out the difference Δx in the positions where each crosses the principal axis.
A 18.0 kg loudspeaker is suspended 2.40m below the ceiling by two 4.10m long cables that angle outward at equal angles. What is the tension of each of the cables.
How does this number of calories compare with the number of calories required to vary the same gram of 100 degree C boiling water to 100 degree C steam.
Establish the temperature at the interface
What is the magnitude and direction of the magnetic field
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