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A woman pulls a loaded sled of mass m = 75 kg along a horizontal surface at constant velocity. The coefficient of kinetic friction ?k between the runners and the snow is 0.10 and the angle ? is 42o. (a) What is the tension T in the rope? (b) What is the normal force with which the snow pushes vertically upward on the sled?
A sample of 23892U is decaying at a rate of 455 decays/s . The half-life is 4.468E9yr. compute the mass of the sample
A horse races once around a circular track in a time of 118s, with a speed of 17 m/s. What is the radius of the track? How do you go about solving this.
A playground is on the flat roof of a city school, 5.9 m above the street below (see figure). The vertical wall of the building is h = 7.40 m high, Find the speed at which the ball was launched
what is the translational rms speed of carbon dioxide molecules.
An instructor wants to use a lens to project the real image of a light bulb onto a screen 1.23 m from the bulb. In order to get the image to be two times as large as bulb, what focal length lens will be required.
Two protons are maintained at a separation of 803 nm. Calculate the electric potential due to the two particles at the midpoint between them
The switch in a circuit has been open for a long time. The resistors in the circuit each have a value of 60 Ohms, find the total equivalent inductance of the circuit
A high-voltage transmission line with a resistance of 0.33 omegacap.gif/km carries a current of 1040 A. compute the power loss due to resistance in the line
A freshly prepared sample of a certain radioactive isotope has an activity of 11.2 mCi. After 4.40 h, its activity is 8.00 mCi. Find the decay constant
A guitar string with a mass of 12 g is 80 cm long and attached to the guitar at two points separated by 65 cm. What is the frequency of its fundamental note when it is placed under a tension of 170 N? Answer A) 74 Hz B) 82 Hz C) 93 Hz D) 150 Hz E)..
How much must this spring be stretched to store.
If astronauts could travel at v = 0.950 c, we on Earth would say it takes (4.20 / 0.970) = 4.42 years to reach Alpha Centauri, 4.20 light-years away. The astronauts disagree. How much time passes on astronauts' clocks? What is the distance to Alph..
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