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A blow-dryer and a vacuum cleaner each operate with a voltage of 120 V. The current rating of the blow-dryer is 14 A, while that of the vacuum cleaner is 4.7 A. Decide the power consumed by (a) the blow-dryer and (b) the vacuum cleaner. (c) Decide the ratio of the energy utilized by the blow-dryer in 12 minutes to the energy utilized by the vacuum cleaner in 57 minutes.
A beam of laser light of wavelength 632.8 nm has a circular cross-section 2.00 mm in diameter. Find the required width and height of the aperture
An incredibly large slingshot is stretched 1.5 meters to launch a 180.0-gram projectile with a speed sufficient to escape from the Earth (11.2 km/s). How many people would be required to stretch the slingshot
Two thermal reservoirs are connected by a solid copper bar. The bar is 3 m long, and the temperatures of the reservoirs are 63.0°C and 32.0°C. What is the rate of heat flow through the bar
John measured the thickness of a book using a measuring stick. Calculate the mean thickness of the book
A conducting spherical shell of inner radius b and outer radius c is concentric with a small metal sphere of radius a
As morning sunlight falls on a tethered helium balloon, it expands from a volume of 1.05 ×103 m3 to 1.15 ×103 m3. how much does the helium's internal energy increase
A positron (q = +e) movesat 5.4 107 m/s in a magneticfield of magnitude 0.51 T.The magnetic force on the positron has magnitude 1.5 10-12 N.
Without taking the existence of the nebula into consideration, based on its apparent magnitude, how far away does the star in part (b) appear to be? What would the propotion error be in determining the distance if interstellar extinction were negl..
A spring (k = 866 N/m) is hanging from the ceiling of an elevator, and a 7.3-kg object is attached to the lower end. By how much does the spring stretch
the motor in a refrigerator has power p. if the freezing compartment is at temperature tl and the outside air is at
A listener is standing in front of two speakers that are producing sound of the same frequency and amplitude
A spherical capacitor consists of two concentric spherical metal shells and has a radius a for the outer sphere and b for the inner sphere. Calculate the capacitance.
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