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An object is placed at a distance of 40 cm from a thin lens. If a virtual image forms at a distance of 50 cm from the lens, on the same side as the object, what is the focal length of the lens?
he New England Merchants Bank Building in Boston is 152m high. On windy days it sways with a frequency of 0.20Hz, What is the total distance, side to side, that the top of the building moves during such an oscillation
The dielectric in a capacitor serves two purposes. It increased the capacitance, compared to an otherwise identical capacitor with an air gap, What is the maximum energy that can be stored if the plates are separated by a 0.50-mm-thick Teflon sheet
A small object with a mass of 333 mg carries a charge of 30.0 nC and is suspended by a thread between the vertical plates of the parallel-plate capacitor. The plates are separated by 2cm.
A magnetic field is perpendicular to the plane of a single-turn circular coil. The magnitude of the field is changing, so that anemf of 0.69 V and a current of2.8 A are induced in the coil.
The averageintensity of sunlight at the top of the earth's atmosphere is 1390W/m2. What is the maximum energy that a 25 m multiplied by 50 m solar panelcould collect in one hour in this sunlight?
compare the energy consumption of two commonly used items in the household. calculate the energy used by a 1.40 kw
A battery has an internal resistance of 0.60 ?. A number of identical light bulbs, each with a resistance of 9.6 ?, How many bulbs are connected
A small car with mass 0.690 travels at constant speed on the inside of the track that is a vertical circle with radius 5.00. If the normal force exerted by the track on the car when it is at the top of the track (point) is 6.00, what is the normal fo..
A 1000-kilogram race car is traveling at 60 m/s around a curved section of track that has a radius of 300 m. What is the car's centripetal acceleration? What is the centripetal force that acts on the car?
An Olympic long jumper leaves the ground at an angle of 23 degrees and travels through the air a horizontal distance of 9.7 meters before landing
One and one-half moles of an ideal monatomic gas expand adiabatically, performing 7910 J of work in the process. What is the change in temperature of the gas during this expansion
A heat engine is taking in 400 J from a hot reservoir that is at 20 degrees Celsius. It expels heat to a cold reservoir at 0 degrees Celsius> What is the ideal efficiency of the engine
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