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A picture of width 42.0 cm, weighing 22.0 N, hangs from a nail by means of flexible wire attached to the sides of the picture frame. The midpoint of the wire passes over the nail, which is 3.20 cm higher than the points where the wire is attached to the frame. Find the tension in the wire.
Radiation falling on a perfectly reflecting surface produces an average pressure p. what is the pressure at that surface in terms of p
Calculate the magnitude of the total electric force on q3 due to the other two charges. What is the direction of the total electric force on q3
At what height above the surface of the earth does the balloon have a speed of 7-m/s.
A space probe enters the thin atmosphere of a planet where the speed of sound is only about 35m/s. (a) What is the probe's Mach number if its initial speed is 15,000km/h (b) What is the angle of the shock wave relative to the direction of motion?
Cell phone sends 1.25ghz magnetic waves. Field vector of the wave has a strength of 24 mv/m and points upward, Which direction does magnetic vector point
Find the mass (e.g. in grams) and number of food calories to in your favourite candy bar, either on-line or by going to a store. We saw in class (see slides) how to convert food calories, a gauge of energy, to Joules, using the facts that there are 0..
a certain substance has a dielectric constant of 3.06 and a dielectric strength of 15.0 mvm. if it is used as the
The temperature of 3.00 mol of an ideal diatomic gas is increased by 40 degrees C without a change in pressure, How much energy is transferred to the gas as heat
A ball has mass 3.0 µg and charge -7 nC moves from point A to point B. What is the change in electric potential energy of the ball
Suppose that the mass of the dishwater is large as much as necessary so that its temperature does not change appreciably.
A 4.1 kg block is held at rest against a vertical wall by a horizontal force of 137 N. What is the magnitude of the frictional force exerted by the wall on the block
An automotive battery has an emf of 12.0 V. When supplying power to the starter motor, the terminal voltage of the battery is 11.2 V and the current in the battery is 16 A. What is the internal resistance of the battery?
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