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Suppose that one weekend day a hiker exerts 200 Watts of power while ascending 300 meters on a steep trail without a pack. The hiker repeats this trip the following weekend but is carrying an additional 10 kilograms in a pack. How much longer should the hiker expect her ascent to take assuming her power output remains the same.
A student gets his car stuck in a snow drift. Not at a loss, having studied physics, he attaches one end of a stout rope to the vehicle. what is the force on the car?
a motorcycle has a constant acceleration of 4.93 ms2. both the velocity and acceleration of the motorcycle point in the
A stick of mass m and length L spins with frequency w around an axis, What is the tension in the string, and what is the force that the pivot applies to the stick
A dragster accelerates from rest down a track of length d = 400.0 m. In the absence of any friction the dragster has a constant acceleration of a = 24 m/s2 in the direction of motion, and its mass is m = 990 kg. Assume the dragster is moving in th..
Consider a square window of side L=1.00m that lies in the plane of the blackboard at the front of the classroom. calculate the electric flux through the window
Nichrome wire is used in some radiative heaters. Find what power will it draw when first switched on
The drawing shows two long, straight wires that are suspended from a ceiling. The mass per unit length of each wire is 0.051kg/m. Each of the four strings suspending the wires has a length of 1.2m.
The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches the base. Evaluate how far does he slide?
To stretch a certain spring by 2.90cm from its equilibrium position requires 7.50J of work. What is the maximum force required to stretch it by that distance
you look over at a really expensive diamond fish bowl. the fish in the bowl is at an angle of 75 to the normal. what angle does light exit the fish bowl
The maximum distance from Earth to the Sun (at our aphelion) is 1.521 x 10^11 m and the distance of closest approach (at perihelion) is 1.471 x 10 ^11 m. Assume the Earth's orbital speed at perihelion is 3.027 x 10 ^ 4 m/s. (overlook the effect of th..
The energy released by alpha decay in a 500.0-g sample of 238 Pu is to be used to heat 4.50 kg (about 1 gallon) of water. Assuming all the energy released by the radioactive decay goes into heating the water, find how much the temperature of the w..
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