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Q1. A 1500 W hair dryer is operated on a 160 V circuit for 5 minutes every day. If electricity costs $0.15/kWh:
a) what is the cost of operating the blow dryer for one day?
b) What is the cost of using the blow dryer for one year (365 days)?
Q2. An iron tower in is 399 meters tall on a cold day (T = -6.7 degrees Celsius). What is its height of the tower on a hot day while the temperature is 31.5 degrees Celsius?
A 83-kg skater sliding due southeast at an initial speed of 2.0 m/s runs into a snow bank, What is change in the kinetic energy of the skater
Two equal forces act on the two different objects, one of which has a mass ten times as large as the other. Will the more massive object have the larger acceleration, an equal accelearation, or a smaller acceleration.
Two cars travel in the same direction along a straight highway, How far must the faster car travel before it has a 15-min lead on the slower car
A virtual image is formed 22.0 cm from a concave mirror having a radius of curvature of 30.5 cm. compute the position of the object
The rope makes an angle of 70.0 degrees with respect to the vertical as shown. Illustrate what is the tangential speed of the ball?
An iron tower in is 307 meters tall on a cold day (T = -8.3 degrees Celsius). What is its height of the tower on a hot day
Household wiring composed of aluminum wire with cross-section area 3.1 x10?6 m2 carries a current of 2.5 A. At what speed are the electrons traveling in this power line
He pulls on a rope that is fastened to the platform and runs over a pulley on the ceiling. Illustrate with what force does he have to pull in order to give himself and the platform an upward acceleration of 1.0 m/s^2?
A high-energy pulsed laser emits a 1.2-ns-longpulse of average power 1.7×1011W. Determine the rms value of the electric field
What is a density of the block
It costs 2.5 cents to charge a car battery at a voltage of 12 V and a current of 13 A for 120 minutes. What is the cost of electrical energy per kilowatt-hour
q1. elmer really likes to cook with onions and he puts onions into almost everything he makes. he generally starts
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