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A Big Mac has 3,100,000 Joules of chemical energy. If electricity costs $0.10/kWh, what is the cost of the electric energy equivalent to the energy in a Big Mac? (the cost of a Big Mac is $3.57)
what time delay Delta t is necessary. A boxcar of mass 600 tons at rest becomes uncoupled on a 5.00 grade. If the track is considered to be frictionless, what speed does the boxcar have after 15 seconds.
What is the efficiency of a pump that uses 3.5kW of electrical power in raising 200 litters of water through a height of 12m in 10 seconds
a piano turner hears one beat every 1.1 second when trying to adjust two strings, How far off in frequency is the other string
A motorcyclist is able to ride on the vertical wall of a bowl- shaped track . his weight is counteracted by the friction of the wall on the tires. what force increase or decrease if he rides faster.
For no apparent reason, a poodle is running at a constant speed of 3.40 m/s in a circle with radius 2.8m. Let v1 be velocity vector at time t1, and let v2 be the velocity vector at time t2.
Laser ligh can be focused (at best) to a spot with a redius [r] equal to its wavelength ([lamba]). Suppose that a 1.0 W beam of green laser light, Estimate the acceleration of the particle
A thin uniform rod (mass = 0.95 kg) swings about an axis that passes through one end of the rod and is perpendicular to the plane of the swing. What is the maximum kinetic energy of the rod as it swings
When a certain air-filled parallel-plate capacitor is connected across a battery, it acquires a charge of magnitude 196 ?C on each plate. What is the dielectric constant of the dielectric slab
A 10.3 kg block is dragged over a rough, horizontal surface by a 63.6 N force acting at 21° above the horizontal. Find the total change in the block's kinetic energy
How much does the spring stretch. A 1200 {rm kg} car traveling at a speed of 15 {rm m/s} skids to a halt on wet concrete where f_k = 0.20. how long are the skid marks.
What is the highest speed with which a 1550 car can round a turn of radius 76 on a flat road if the coefficient of static friction between tires and road is 0.50.
What is distance of a sample of blood from the rotation axis
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