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Question: How long will the energy in a 340 kcal cup of yogurt last in a woman doing work at the rate of 180 W with an efficiency of 20.0% (such as in leisurely climbing stairs)?
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A 0.150 kg ball is going around in a vertical circle of radius R = 0.300 m at constant speed v. The ball is attached to a mass less ideal string which is attached to a fixed pivot point. If the tension F in the string is greater than 125 N, the st..
A 200-pound boy lifts a 40-kg box off of the floor 1.3 meters in 0.7 seconds. determine Which boy is more powerful
When the wavelength of an incident radiation exceeds 560nm the emission of photoelectrons from a surface ceases. What is the stopping potential for this electrons
A pair of slits, separated by 0.170 mm, is illuminated by light having a wavelength of ? = 569 nm. What is the path difference for the two slits at the location y
If a particle of mass 4.8 kg is moving east at 10 m/s and a particle of mass 17 kg is moving west at 10 m/s, what is the velocity of the center of mass of the pair
a 21 nf capacitor is connected across an ac generator that produces a peak voltage of 4.8 v.a at what frequency is the
A light plane (mass = M) makes an emergency landing on a short runway. With its engine off, it lands at speed v0. A hook on the plane snags a cable attached to a sandbag (mass = m) and drags the sandbag along. The coefficient of friction between the ..
A person wears a hearing aid that uniformly increases the sound level of all audible frequencies of sound by 35.7 dB. What is the intensity delivered to the eardrum
a child loses his balloon which rises slowly into the sky. if the balloon is 14 cm in diameter when the child loses it
Suppose 2.50 kg of 32 degrees C water is mixed with 9.30 kg of 65 degrees C water. If no heat is lost in this system, what is the final temperature of the water
In a certain cyclotron a proton moves in a circle of radius0.700 m. The magnitude of the magnetic field is 1.40 T. What is the oscillator frequency? What is the kinetic energy of the proton?
Assume a spacecraft is orbiting the earth at a constant radius of 7.00x10^3km. At t=0 a lateral rocket is fired that imparts an inward-directed radial velocity. What is the minimum radial velocity needed to produce a parabolic trajectory, and what wi..
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